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https://github.com/projectdiscovery/katana

A next-generation crawling and spidering framework.
https://github.com/projectdiscovery/katana

cli crawler gocrawler headless spider-framework web-spider

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A next-generation crawling and spidering framework.

Lists

README 

        


  katana

  





A next-generation crawling and spidering framework




















  Features •

  Installation •

  Usage •

  Scope •

  Config •

  Filters •

  Join Discord




# Features



![image](https://user-images.githubusercontent.com/8293321/199371558-daba03b6-bf9c-4883-8506-76497c6c3a44.png)



 - Fast And fully configurable web crawling

 - **Standard** and **Headless** mode

 - **Active** and **Passive** mode

 - **JavaScript** parsing / crawling

 - Customizable **automatic form filling**

 - **Scope control** - Preconfigured field / Regex 

 - **Customizable output** - Preconfigured fields

 - INPUT - **STDIN**, **URL** and **LIST**

 - OUTPUT - **STDOUT**, **FILE** and **JSON**



## Installation



katana requires **Go 1.18** to install successfully. To install, just run the below command or download pre-compiled binary from [release page](https://github.com/projectdiscovery/katana/releases).



```console

go install github.com/projectdiscovery/katana/cmd/katana@latest

```



**More options to install / run katana-**



  Docker



> To install / update docker to latest tag -



```sh

docker pull projectdiscovery/katana:latest

```



> To run katana in standard mode using docker -



```sh

docker run projectdiscovery/katana:latest -u https://tesla.com

```



> To run katana in headless mode using docker -



```sh

docker run projectdiscovery/katana:latest -u https://tesla.com -system-chrome -headless

```



  Ubuntu



> It's recommended to install the following prerequisites -



```sh

sudo apt update

sudo snap refresh

sudo apt install zip curl wget git

sudo snap install golang --classic

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - 

sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'

sudo apt update 

sudo apt install google-chrome-stable

```



> install katana -



```sh

go install github.com/projectdiscovery/katana/cmd/katana@latest

```



## Usage



```console

katana -h

```



This will display help for the tool. Here are all the switches it supports.



```console

Katana is a fast crawler focused on execution in automation

pipelines offering both headless and non-headless crawling.



Usage:

  ./katana [flags]



Flags:

INPUT:

   -u, -list string[]  target url / list to crawl

   -resume string      resume scan using resume.cfg

   -e, -exclude string[]  exclude host matching specified filter ('cdn', 'private-ips', cidr, ip, regex)



CONFIGURATION:

   -r, -resolvers string[]       list of custom resolver (file or comma separated)

   -d, -depth int                maximum depth to crawl (default 3)

   -jc, -js-crawl                enable endpoint parsing / crawling in javascript file

   -jsl, -jsluice                enable jsluice parsing in javascript file (memory intensive)

   -ct, -crawl-duration value    maximum duration to crawl the target for (s, m, h, d) (default s)

   -kf, -known-files string      enable crawling of known files (all,robotstxt,sitemapxml), a minimum depth of 3 is required to ensure all known files are properly crawled.

   -mrs, -max-response-size int  maximum response size to read (default 9223372036854775807)

   -timeout int                  time to wait for request in seconds (default 10)

   -aff, -automatic-form-fill    enable automatic form filling (experimental)

   -fx, -form-extraction         extract form, input, textarea & select elements in jsonl output

   -retry int                    number of times to retry the request (default 1)

   -proxy string                 http/socks5 proxy to use

   -H, -headers string[]         custom header/cookie to include in all http request in header:value format (file)

   -config string                path to the katana configuration file

   -fc, -form-config string      path to custom form configuration file

   -flc, -field-config string    path to custom field configuration file

   -s, -strategy string          Visit strategy (depth-first, breadth-first) (default "depth-first")

   -iqp, -ignore-query-params    Ignore crawling same path with different query-param values

   -tlsi, -tls-impersonate       enable experimental client hello (ja3) tls randomization

   -dr, -disable-redirects       disable following redirects (default false)



DEBUG:

   -health-check, -hc        run diagnostic check up

   -elog, -error-log string  file to write sent requests error log



HEADLESS:

   -hl, -headless                    enable headless hybrid crawling (experimental)

   -sc, -system-chrome               use local installed chrome browser instead of katana installed

   -sb, -show-browser                show the browser on the screen with headless mode

   -ho, -headless-options string[]   start headless chrome with additional options

   -nos, -no-sandbox                 start headless chrome in --no-sandbox mode

   -cdd, -chrome-data-dir string     path to store chrome browser data

   -scp, -system-chrome-path string  use specified chrome browser for headless crawling

   -noi, -no-incognito               start headless chrome without incognito mode

   -cwu, -chrome-ws-url string       use chrome browser instance launched elsewhere with the debugger listening at this URL

   -xhr, -xhr-extraction             extract xhr request url,method in jsonl output



PASSIVE:

   -ps, -passive                   enable passive sources to discover target endpoints

   -pss, -passive-source string[]  passive source to use for url discovery (waybackarchive,commoncrawl,alienvault)



SCOPE:

   -cs, -crawl-scope string[]       in scope url regex to be followed by crawler

   -cos, -crawl-out-scope string[]  out of scope url regex to be excluded by crawler

   -fs, -field-scope string         pre-defined scope field (dn,rdn,fqdn) or custom regex (e.g., '(company-staging.io|company.com)') (default "rdn")

   -ns, -no-scope                   disables host based default scope

   -do, -display-out-scope          display external endpoint from scoped crawling



FILTER:

   -mr, -match-regex string[]       regex or list of regex to match on output url (cli, file)

   -fr, -filter-regex string[]      regex or list of regex to filter on output url (cli, file)

   -f, -field string                field to display in output (url,path,fqdn,rdn,rurl,qurl,qpath,file,ufile,key,value,kv,dir,udir)

   -sf, -store-field string         field to store in per-host output (url,path,fqdn,rdn,rurl,qurl,qpath,file,ufile,key,value,kv,dir,udir)

   -em, -extension-match string[]   match output for given extension (eg, -em php,html,js)

   -ef, -extension-filter string[]  filter output for given extension (eg, -ef png,css)

   -mdc, -match-condition string    match response with dsl based condition

   -fdc, -filter-condition string   filter response with dsl based condition



RATE-LIMIT:

   -c, -concurrency int          number of concurrent fetchers to use (default 10)

   -p, -parallelism int          number of concurrent inputs to process (default 10)

   -rd, -delay int               request delay between each request in seconds

   -rl, -rate-limit int          maximum requests to send per second (default 150)

   -rlm, -rate-limit-minute int  maximum number of requests to send per minute



UPDATE:

   -up, -update                 update katana to latest version

   -duc, -disable-update-check  disable automatic katana update check



OUTPUT:

   -o, -output string                file to write output to

   -sr, -store-response              store http requests/responses

   -srd, -store-response-dir string  store http requests/responses to custom directory

   -or, -omit-raw                    omit raw requests/responses from jsonl output

   -ob, -omit-body                   omit response body from jsonl output

   -j, -jsonl                        write output in jsonl format

   -nc, -no-color                    disable output content coloring (ANSI escape codes)

   -silent                           display output only

   -v, -verbose                      display verbose output

   -debug                            display debug output

   -version                          display project version

```



## Running Katana



### Input for katana



**katana** requires **url** or **endpoint** to crawl and accepts single or multiple inputs.



Input URL can be provided using `-u` option, and multiple values can be provided using comma-separated input, similarly **file** input is supported using `-list` option and additionally piped input (stdin) is also supported.



#### URL Input



```sh

katana -u https://tesla.com

```



#### Multiple URL Input (comma-separated)



```sh

katana -u https://tesla.com,https://google.com

```



#### List Input

```bash

$ cat url_list.txt



https://tesla.com

https://google.com

```



```

katana -list url_list.txt

```



#### STDIN (piped) Input



```sh

echo https://tesla.com | katana

```



```sh

cat domains | httpx | katana

```



Example running katana -



```console

katana -u https://youtube.com



   __        __                

  / /_____ _/ /____ ____  ___ _

 /  '_/ _  / __/ _  / _ \/ _  /

/_/\_\\_,_/\__/\_,_/_//_/\_,_/ v0.0.1                     



      projectdiscovery.io



[WRN] Use with caution. You are responsible for your actions.

[WRN] Developers assume no liability and are not responsible for any misuse or damage.

https://www.youtube.com/

https://www.youtube.com/about/

https://www.youtube.com/about/press/

https://www.youtube.com/about/copyright/

https://www.youtube.com/t/contact_us/

https://www.youtube.com/creators/

https://www.youtube.com/ads/

https://www.youtube.com/t/terms

https://www.youtube.com/t/privacy

https://www.youtube.com/about/policies/

https://www.youtube.com/howyoutubeworks?utm_campaign=ytgen&utm_source=ythp&utm_medium=LeftNav&utm_content=txt&u=https%3A%2F%2Fwww.youtube.com%2Fhowyoutubeworks%3Futm_source%3Dythp%26utm_medium%3DLeftNav%26utm_campaign%3Dytgen

https://www.youtube.com/new

https://m.youtube.com/

https://www.youtube.com/s/desktop/4965577f/jsbin/desktop_polymer.vflset/desktop_polymer.js

https://www.youtube.com/s/desktop/4965577f/cssbin/www-main-desktop-home-page-skeleton.css

https://www.youtube.com/s/desktop/4965577f/cssbin/www-onepick.css

https://www.youtube.com/s/_/ytmainappweb/_/ss/k=ytmainappweb.kevlar_base.0Zo5FUcPkCg.L.B1.O/am=gAE/d=0/rs=AGKMywG5nh5Qp-BGPbOaI1evhF5BVGRZGA

https://www.youtube.com/opensearch?locale=en_GB

https://www.youtube.com/manifest.webmanifest

https://www.youtube.com/s/desktop/4965577f/cssbin/www-main-desktop-watch-page-skeleton.css

https://www.youtube.com/s/desktop/4965577f/jsbin/web-animations-next-lite.min.vflset/web-animations-next-lite.min.js

https://www.youtube.com/s/desktop/4965577f/jsbin/custom-elements-es5-adapter.vflset/custom-elements-es5-adapter.js

https://www.youtube.com/s/desktop/4965577f/jsbin/webcomponents-sd.vflset/webcomponents-sd.js

https://www.youtube.com/s/desktop/4965577f/jsbin/intersection-observer.min.vflset/intersection-observer.min.js

https://www.youtube.com/s/desktop/4965577f/jsbin/scheduler.vflset/scheduler.js

https://www.youtube.com/s/desktop/4965577f/jsbin/www-i18n-constants-en_GB.vflset/www-i18n-constants.js

https://www.youtube.com/s/desktop/4965577f/jsbin/www-tampering.vflset/www-tampering.js

https://www.youtube.com/s/desktop/4965577f/jsbin/spf.vflset/spf.js

https://www.youtube.com/s/desktop/4965577f/jsbin/network.vflset/network.js

https://www.youtube.com/howyoutubeworks/

https://www.youtube.com/trends/

https://www.youtube.com/jobs/

https://www.youtube.com/kids/

```



## Crawling Mode



### Standard Mode



Standard crawling modality uses the standard go http library under the hood to handle HTTP requests/responses. This modality is much faster as it doesn't have the browser overhead. Still, it analyzes HTTP responses body as is, without any javascript or DOM rendering, potentially missing post-dom-rendered endpoints or asynchronous endpoint calls that might happen in complex web applications depending, for example, on browser-specific events.



### Headless Mode



Headless mode hooks internal headless calls to handle HTTP requests/responses directly within the browser context. This offers two advantages:

- The HTTP fingerprint (TLS and user agent) fully identify the client as a legitimate browser

- Better coverage since the endpoints are discovered analyzing the standard raw response, as in the previous modality, and also the browser-rendered one with javascript enabled.



Headless crawling is optional and can be enabled using `-headless` option.



Here are other headless CLI options -



```console

katana -h headless



Flags:

HEADLESS:

   -hl, -headless                    enable headless hybrid crawling (experimental)

   -sc, -system-chrome               use local installed chrome browser instead of katana installed

   -sb, -show-browser                show the browser on the screen with headless mode

   -ho, -headless-options string[]   start headless chrome with additional options

   -nos, -no-sandbox                 start headless chrome in --no-sandbox mode

   -cdd, -chrome-data-dir string     path to store chrome browser data

   -scp, -system-chrome-path string  use specified chrome browser for headless crawling

   -noi, -no-incognito               start headless chrome without incognito mode

   -cwu, -chrome-ws-url string       use chrome browser instance launched elsewhere with the debugger listening at this URL

   -xhr, -xhr-extraction             extract xhr requests

```



*`-no-sandbox`*

----



Runs headless chrome browser with **no-sandbox** option, useful when running as root user.



```console

katana -u https://tesla.com -headless -no-sandbox

```



*`-no-incognito`*

----



Runs headless chrome browser without incognito mode, useful when using the local browser.



```console

katana -u https://tesla.com -headless -no-incognito

```



*`-headless-options`*

----



When crawling in headless mode, additional chrome options can be specified using `-headless-options`, for example -



```console

katana -u https://tesla.com -headless -system-chrome -headless-options --disable-gpu,proxy-server=http://127.0.0.1:8080

```



## Scope Control



Crawling can be endless if not scoped, as such katana comes with multiple support to define the crawl scope.



*`-field-scope`*

----

Most handy option to define scope with predefined field name, `rdn` being default option for field scope.



   - `rdn` - crawling scoped to root domain name and all subdomains (e.g. `*example.com`) (default)

   - `fqdn` - crawling scoped to given sub(domain) (e.g. `www.example.com` or `api.example.com`)

   - `dn` - crawling scoped to domain name keyword (e.g. `example`)



```console

katana -u https://tesla.com -fs dn

```



*`-crawl-scope`*

------



For advanced scope control, `-cs` option can be used that comes with **regex** support.



```console

katana -u https://tesla.com -cs login

```



For multiple in scope rules, file input with multiline string / regex can be passed.



```bash

$ cat in_scope.txt



login/

admin/

app/

wordpress/

```



```console

katana -u https://tesla.com -cs in_scope.txt

```



*`-crawl-out-scope`*

-----



For defining what not to crawl, `-cos` option can be used and also support **regex** input.



```console

katana -u https://tesla.com -cos logout

```



For multiple out of scope rules, file input with multiline string / regex can be passed.



```bash

$ cat out_of_scope.txt



/logout

/log_out

```



```console

katana -u https://tesla.com -cos out_of_scope.txt

```



*`-no-scope`*

----



Katana is default to scope `*.domain`, to disable this `-ns` option can be used and also to crawl the internet.



```console

katana -u https://tesla.com -ns

```



*`-display-out-scope`*

----



As default, when scope option is used, it also applies for the links to display as output, as such **external URLs are default to exclude** and to overwrite this behavior, `-do` option can be used to display all the external URLs that exist in targets scoped URL / Endpoint.



```

katana -u https://tesla.com -do

```



Here is all the CLI options for the scope control -



```console

katana -h scope



Flags:

SCOPE:

   -cs, -crawl-scope string[]       in scope url regex to be followed by crawler

   -cos, -crawl-out-scope string[]  out of scope url regex to be excluded by crawler

   -fs, -field-scope string         pre-defined scope field (dn,rdn,fqdn) (default "rdn")

   -ns, -no-scope                   disables host based default scope

   -do, -display-out-scope          display external endpoint from scoped crawling

```



## Crawler Configuration



Katana comes with multiple options to configure and control the crawl as the way we want.



*`-depth`*

----



Option to define the `depth` to follow the urls for crawling, the more depth the more number of endpoint being crawled + time for crawl.



```

katana -u https://tesla.com -d 5

```



*`-js-crawl`*

----



Option to enable JavaScript file parsing + crawling the endpoints discovered in JavaScript files, disabled as default.



```

katana -u https://tesla.com -jc

```



*`-crawl-duration`*

----



Option to predefined crawl duration, disabled as default.



```

katana -u https://tesla.com -ct 2

```



*`-known-files`*

----

Option to enable crawling `robots.txt` and `sitemap.xml` file, disabled as default.



```

katana -u https://tesla.com -kf robotstxt,sitemapxml

```



*`-automatic-form-fill`*

----



Option to enable automatic form filling for known / unknown fields, known field values can be customized as needed by updating form config file at `$HOME/.config/katana/form-config.yaml`.



Automatic form filling is experimental feature.



```

katana -u https://tesla.com -aff

```



## Authenticated Crawling



Authenticated crawling involves including custom headers or cookies in HTTP requests to access protected resources. These headers provide authentication or authorization information, allowing you to crawl authenticated content / endpoint. You can specify headers directly in the command line or provide them as a file with katana to perfrom authenticated crawling.



> **Note**: User needs to be manually perform the authentication and export the session cookie / header to file to use with katana.



*`-headers`*

----



Option to add a custom header or cookie to the request. 

> Syntax of [headers](https://datatracker.ietf.org/doc/html/rfc7230#section-3.2) in the HTTP specification



Here is an example of adding a cookie to the request:

```

katana -u https://tesla.com -H 'Cookie: usrsess=AmljNrESo'

```



It is also possible to supply headers or cookies as a file. For example:



```

$ cat cookie.txt



Cookie: PHPSESSIONID=XXXXXXXXX

X-API-KEY: XXXXX

TOKEN=XX

```



```

katana -u https://tesla.com -H cookie.txt

```



There are more options to configure when needed, here is all the config related CLI options - 



```console

katana -h config



Flags:

CONFIGURATION:

   -r, -resolvers string[]       list of custom resolver (file or comma separated)

   -d, -depth int                maximum depth to crawl (default 3)

   -jc, -js-crawl                enable endpoint parsing / crawling in javascript file

   -ct, -crawl-duration int      maximum duration to crawl the target for

   -kf, -known-files string      enable crawling of known files (all,robotstxt,sitemapxml)

   -mrs, -max-response-size int  maximum response size to read (default 9223372036854775807)

   -timeout int                  time to wait for request in seconds (default 10)

   -aff, -automatic-form-fill    enable automatic form filling (experimental)

   -fx, -form-extraction         enable extraction of form, input, textarea & select elements

   -retry int                    number of times to retry the request (default 1)

   -proxy string                 http/socks5 proxy to use

   -H, -headers string[]         custom header/cookie to include in request

   -config string                path to the katana configuration file

   -fc, -form-config string      path to custom form configuration file

   -flc, -field-config string    path to custom field configuration file

   -s, -strategy string          Visit strategy (depth-first, breadth-first) (default "depth-first")

```



### Connecting to Active Browser Session



Katana can also connect to active browser session where user is already logged in and authenticated. and use it for crawling. The only requirement for this is to start browser with remote debugging enabled.



Here is an example of starting chrome browser with remote debugging enabled and using it with katana -



**step 1) First Locate path of chrome executable**



| Operating System | Chromium Executable Location | Google Chrome Executable Location |

|------------------|------------------------------|-----------------------------------|

| Windows (64-bit) | `C:\Program Files (x86)\Google\Chromium\Application\chrome.exe` | `C:\Program Files (x86)\Google\Chrome\Application\chrome.exe` |

| Windows (32-bit) | `C:\Program Files\Google\Chromium\Application\chrome.exe` | `C:\Program Files\Google\Chrome\Application\chrome.exe` |

| macOS | `/Applications/Chromium.app/Contents/MacOS/Chromium` | `/Applications/Google Chrome.app/Contents/MacOS/Google Chrome` |

| Linux | `/usr/bin/chromium` | `/usr/bin/google-chrome` |



**step 2) Start chrome with remote debugging enabled and it will return websocker url. For example, on MacOS, you can start chrome with remote debugging enabled using following command** -



```console

$ /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --remote-debugging-port=9222



DevTools listening on ws://127.0.0.1:9222/devtools/browser/c5316c9c-19d6-42dc-847a-41d1aeebf7d6

```



> Now login to the website you want to crawl and keep the browser open.



**step 3) Now use the websocket url with katana to connect to the active browser session and crawl the website**



```console

katana -headless -u https://tesla.com -cwu ws://127.0.0.1:9222/devtools/browser/c5316c9c-19d6-42dc-847a-41d1aeebf7d6 -no-incognito

```



> **Note**: you can use `-cdd` option to specify custom chrome data directory to store browser data and cookies but that does not save session data if cookie is set to `Session` only or expires after certain time.



## Filters



*`-field`*

----



Katana comes with built in fields that can be used to filter the output for the desired information, `-f` option can be used to specify any of the available fields.



```

   -f, -field string  field to display in output (url,path,fqdn,rdn,rurl,qurl,qpath,file,key,value,kv,dir,udir)

```



Here is a table with examples of each field and expected output when used - 



| FIELD   | DESCRIPTION                 | EXAMPLE                                                      |

| ------- | --------------------------- | ------------------------------------------------------------ |

| `url`   | URL Endpoint                | `https://admin.projectdiscovery.io/admin/login?user=admin&password=admin` |

| `qurl`  | URL including query param   | `https://admin.projectdiscovery.io/admin/login.php?user=admin&password=admin` |

| `qpath` | Path including query param  | `/login?user=admin&password=admin`                           |

| `path`  | URL Path                    | `https://admin.projectdiscovery.io/admin/login`              |

| `fqdn`  | Fully Qualified Domain name | `admin.projectdiscovery.io`                                  |

| `rdn`   | Root Domain name            | `projectdiscovery.io`                                        |

| `rurl`  | Root URL                    | `https://admin.projectdiscovery.io`                          |

| `ufile` | URL with File               | `https://admin.projectdiscovery.io/login.js`                 |

| `file`  | Filename in URL             | `login.php`                                                  |

| `key`   | Parameter keys in URL       | `user,password`                                              |

| `value` | Parameter values in URL     | `admin,admin`                                                |

| `kv`    | Keys=Values in URL          | `user=admin&password=admin`                                  |

| `dir`   | URL Directory name          | `/admin/`                                                    |

| `udir`  | URL with Directory          | `https://admin.projectdiscovery.io/admin/`                   |



Here is an example of using field option to only display all the urls with query parameter in it -



```

katana -u https://tesla.com -f qurl -silent



https://shop.tesla.com/en_au?redirect=no

https://shop.tesla.com/en_nz?redirect=no

https://shop.tesla.com/product/men_s-raven-lightweight-zip-up-bomber-jacket?sku=1740250-00-A

https://shop.tesla.com/product/tesla-shop-gift-card?sku=1767247-00-A

https://shop.tesla.com/product/men_s-chill-crew-neck-sweatshirt?sku=1740176-00-A

https://www.tesla.com/about?redirect=no

https://www.tesla.com/about/legal?redirect=no

https://www.tesla.com/findus/list?redirect=no

```



### Custom Fields



You can create custom fields to extract and store specific information from page responses using regex rules. These custom fields are defined using a YAML config file and are loaded from the default location at `$HOME/.config/katana/field-config.yaml`. Alternatively, you can use the `-flc` option to load a custom field config file from a different location.

Here is example custom field.



```yaml

- name: email

  type: regex

  regex:

  - '([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9_-]+)'

  - '([a-zA-Z0-9+._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9_-]+)'



- name: phone

  type: regex

  regex:

  - '\d{3}-\d{8}|\d{4}-\d{7}'

```



When defining custom fields, following attributes are supported:



- **name** (required)



> The value of **name** attribute is used as the `-field` cli option value.



- **type** (required)



> The type of custom attribute, currenly supported option - `regex` 



- **part** (optional)



> The part of the response to extract the information from. The default value is `response`, which includes both the header and body. Other possible values are `header` and `body`.



- group (optional)



> You can use this attribute to select a specific matched group in regex, for example: `group: 1`



#### Running katana using custom field:



```console

katana -u https://tesla.com -f email,phone

```



*`-store-field`*

---



To compliment `field` option which is useful to filter output at run time, there is `-sf, -store-fields` option which works exactly like field option except instead of filtering, it stores all the information on the disk under `katana_field` directory sorted by target url.



```

katana -u https://tesla.com -sf key,fqdn,qurl -silent

```



```bash

$ ls katana_field/



https_www.tesla.com_fqdn.txt

https_www.tesla.com_key.txt

https_www.tesla.com_qurl.txt

```



The `-store-field` option can be useful for collecting information to build a targeted wordlist for various purposes, including but not limited to:



- Identifying the most commonly used parameters

- Discovering frequently used paths

- Finding commonly used files

- Identifying related or unknown subdomains



### Katana Filters



*`-extension-match`*

---



Crawl output can be easily matched for specific extension using `-em` option to ensure to display only output containing given extension.



```

katana -u https://tesla.com -silent -em js,jsp,json

```



*`-extension-filter`*

---



Crawl output can be easily filtered for specific extension using `-ef` option which ensure to remove all the urls containing given extension.



```

katana -u https://tesla.com -silent -ef css,txt,md

```



*`-match-regex`*

---

The `-match-regex` or `-mr` flag allows you to filter output URLs using regular expressions. When using this flag, only URLs that match the specified regular expression will be printed in the output.



```

katana -u https://tesla.com -mr 'https://shop\.tesla\.com/*' -silent

```

*`-filter-regex`*

---

The `-filter-regex` or `-fr` flag allows you to filter output URLs using regular expressions. When using this flag, it will skip the URLs that are match the specified regular expression.



```

katana -u https://tesla.com -fr 'https://www\.tesla\.com/*' -silent

```



### Advance Filtering



Katana supports DSL-based expressions for advanced matching and filtering capabilities:



- To match endpoints with a 200 status code:

```shell

katana -u https://www.hackerone.com -mdc 'status_code == 200'

```

- To match endpoints that contain "default" and have a status code other than 403:

```shell

katana -u https://www.hackerone.com -mdc 'contains(endpoint, "default") && status_code != 403'

```

- To match endpoints with PHP technologies:

```shell

katana -u https://www.hackerone.com -mdc 'contains(to_lower(technologies), "php")'

```

- To filter out endpoints running on Cloudflare:

```shell

katana -u https://www.hackerone.com -fdc 'contains(to_lower(technologies), "cloudflare")'

```

DSL functions can be applied to any keys in the jsonl output. For more information on available DSL functions, please visit the [dsl project](https://github.com/projectdiscovery/dsl).



Here are additional filter options -



```console

katana -h filter



Flags:

FILTER:

   -mr, -match-regex string[]       regex or list of regex to match on output url (cli, file)

   -fr, -filter-regex string[]      regex or list of regex to filter on output url (cli, file)

   -f, -field string                field to display in output (url,path,fqdn,rdn,rurl,qurl,qpath,file,ufile,key,value,kv,dir,udir)

   -sf, -store-field string         field to store in per-host output (url,path,fqdn,rdn,rurl,qurl,qpath,file,ufile,key,value,kv,dir,udir)

   -em, -extension-match string[]   match output for given extension (eg, -em php,html,js)

   -ef, -extension-filter string[]  filter output for given extension (eg, -ef png,css)

   -mdc, -match-condition string    match response with dsl based condition

   -fdc, -filter-condition string   filter response with dsl based condition

```



## Rate Limit



It's easy to get blocked / banned while crawling if not following target websites limits, katana comes with multiple option to tune the crawl to go as fast / slow we want.



*`-delay`*

-----



option to introduce a delay in seconds between each new request katana makes while crawling, disabled as default.



```

katana -u https://tesla.com -delay 20

```



*`-concurrency`*

-----

option to control the number of urls per target to fetch at the same time.



```

katana -u https://tesla.com -c 20

```



*`-parallelism`*

-----

option to define number of target to process at same time from list input.



```

katana -u https://tesla.com -p 20

```



*`-rate-limit`*

-----

option to use to define max number of request can go out per second.



```

katana -u https://tesla.com -rl 100

```



*`-rate-limit-minute`*

-----

option to use to define max number of request can go out per minute.



```

katana -u https://tesla.com -rlm 500

```



Here is all long / short CLI options for rate limit control -



```console

katana -h rate-limit



Flags:

RATE-LIMIT:

   -c, -concurrency int          number of concurrent fetchers to use (default 10)

   -p, -parallelism int          number of concurrent inputs to process (default 10)

   -rd, -delay int               request delay between each request in seconds

   -rl, -rate-limit int          maximum requests to send per second (default 150)

   -rlm, -rate-limit-minute int  maximum number of requests to send per minute

```



## Output



Katana support both file output in plain text format as well as JSON which includes additional information like, `source`, `tag`, and `attribute` name to co-related the discovered endpoint.



*`-output`*



By default, katana outputs the crawled endpoints in plain text format. The results can be written to a file by using the -output option.



```console

katana -u https://example.com -no-scope -output example_endpoints.txt

```



*`-jsonl`*

---



```console

katana -u https://example.com -jsonl | jq .

```



```json

{

  "timestamp": "2023-03-20T16:23:58.027559+05:30",

  "request": {

    "method": "GET",

    "endpoint": "https://example.com",

    "raw": "GET / HTTP/1.1\r\nHost: example.com\r\nUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36\r\nAccept-Encoding: gzip\r\n\r\n"

  },

  "response": {

    "status_code": 200,

    "headers": {

      "accept_ranges": "bytes",

      "expires": "Mon, 27 Mar 2023 10:53:58 GMT",

      "last_modified": "Thu, 17 Oct 2019 07:18:26 GMT",

      "content_type": "text/html; charset=UTF-8",

      "server": "ECS (dcb/7EA3)",

      "vary": "Accept-Encoding",

      "etag": "\"3147526947\"",

      "cache_control": "max-age=604800",

      "x_cache": "HIT",

      "date": "Mon, 20 Mar 2023 10:53:58 GMT",

      "age": "331239"

    },

    "body": "\n\n\n    Example Domain\n\n    \n    \n    \n    \n    body {\n        background-color: #f0f0f2;\n        margin: 0;\n        padding: 0;\n        font-family: -apple-system, system-ui, BlinkMacSystemFont, \"Segoe UI\", \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n        \n    }\n    div {\n        width: 600px;\n        margin: 5em auto;\n        padding: 2em;\n        background-color: #fdfdff;\n        border-radius: 0.5em;\n        box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);\n    }\n    a:link, a:visited {\n        color: #38488f;\n        text-decoration: none;\n    }\n    @media (max-width: 700px) {\n        div {\n            margin: 0 auto;\n            width: auto;\n        }\n    }\n        \n\n\n\n
\n    
Example Domain
\n    
This domain is for use in illustrative examples in documents. You may use this\n    domain in literature without prior coordination or asking for permission.
\n    
More information...
\n
\n\n\n",

    "technologies": [

      "Azure",

      "Amazon ECS",

      "Amazon Web Services",

      "Docker",

      "Azure CDN"

    ],

    "raw": "HTTP/1.1 200 OK\r\nContent-Length: 1256\r\nAccept-Ranges: bytes\r\nAge: 331239\r\nCache-Control: max-age=604800\r\nContent-Type: text/html; charset=UTF-8\r\nDate: Mon, 20 Mar 2023 10:53:58 GMT\r\nEtag: \"3147526947\"\r\nExpires: Mon, 27 Mar 2023 10:53:58 GMT\r\nLast-Modified: Thu, 17 Oct 2019 07:18:26 GMT\r\nServer: ECS (dcb/7EA3)\r\nVary: Accept-Encoding\r\nX-Cache: HIT\r\n\r\n\n\n\n    Example Domain\n\n    \n    \n    \n    \n    body {\n        background-color: #f0f0f2;\n        margin: 0;\n        padding: 0;\n        font-family: -apple-system, system-ui, BlinkMacSystemFont, \"Segoe UI\", \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n        \n    }\n    div {\n        width: 600px;\n        margin: 5em auto;\n        padding: 2em;\n        background-color: #fdfdff;\n        border-radius: 0.5em;\n        box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);\n    }\n    a:link, a:visited {\n        color: #38488f;\n        text-decoration: none;\n    }\n    @media (max-width: 700px) {\n        div {\n            margin: 0 auto;\n            width: auto;\n        }\n    }\n        \n\n\n\n
\n    
Example Domain
\n    
This domain is for use in illustrative examples in documents. You may use this\n    domain in literature without prior coordination or asking for permission.
\n    
More information...
\n
\n\n\n"

  }

}

```



*`-store-response`*

----



The `-store-response` option allows for writing all crawled endpoint requests and responses to a text file. When this option is used, text files including the request and response will be written to the **katana_response** directory. If you would like to specify a custom directory, you can use the `-store-response-dir` option.



```console

katana -u https://example.com -no-scope -store-response

```



```bash

$ cat katana_response/index.txt



katana_response/example.com/327c3fda87ce286848a574982ddd0b7c7487f816.txt https://example.com (200 OK)

katana_response/www.iana.org/bfc096e6dd93b993ca8918bf4c08fdc707a70723.txt http://www.iana.org/domains/reserved (200 OK)

```



**Note:**



*`-store-response` option is not supported in `-headless` mode.*



Here are additional CLI options related to output -



```console

katana -h output



OUTPUT:

   -o, -output string                file to write output to

   -sr, -store-response              store http requests/responses

   -srd, -store-response-dir string  store http requests/responses to custom directory

   -j, -json                         write output in JSONL(ines) format

   -nc, -no-color                    disable output content coloring (ANSI escape codes)

   -silent                           display output only

   -v, -verbose                      display verbose output

   -version                          display project version

```



## Katana as a library

`katana` can be used as a library by creating an instance of the `Option` struct and populating it with the same options that would be specified via CLI. Using the options you can create `crawlerOptions` and so standard or hybrid `crawler`.

`crawler.Crawl` method should be called to crawl the input.



```go

package main



import (

	"math"



	"github.com/projectdiscovery/gologger"

	"github.com/projectdiscovery/katana/pkg/engine/standard"

	"github.com/projectdiscovery/katana/pkg/output"

	"github.com/projectdiscovery/katana/pkg/types"

)



func main() {

	options := &types.Options{

		MaxDepth:     3,             // Maximum depth to crawl

		FieldScope:   "rdn",         // Crawling Scope Field

		BodyReadSize: math.MaxInt,   // Maximum response size to read

		Timeout:      10,            // Timeout is the time to wait for request in seconds

		Concurrency:  10,            // Concurrency is the number of concurrent crawling goroutines

		Parallelism:  10,            // Parallelism is the number of urls processing goroutines

		Delay:        0,             // Delay is the delay between each crawl requests in seconds

		RateLimit:    150,           // Maximum requests to send per second

		Strategy:     "depth-first", // Visit strategy (depth-first, breadth-first)

		OnResult: func(result output.Result) { // Callback function to execute for result

			gologger.Info().Msg(result.Request.URL)

		},

	}

	crawlerOptions, err := types.NewCrawlerOptions(options)

	if err != nil {

		gologger.Fatal().Msg(err.Error())

	}

	defer crawlerOptions.Close()

	crawler, err := standard.New(crawlerOptions)

	if err != nil {

		gologger.Fatal().Msg(err.Error())

	}

	defer crawler.Close()

	var input = "https://www.hackerone.com"

	err = crawler.Crawl(input)

	if err != nil {

		gologger.Warning().Msgf("Could not crawl %s: %s", input, err.Error())

	}

}

```

--------






katana is made with ❤️ by the [projectdiscovery](https://projectdiscovery.io) team and distributed under [MIT License](LICENSE.md).



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