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https://github.com/maxlath/jsondepth
a small command-line tool to walk through the depth levels of a JSON objects
https://github.com/maxlath/jsondepth
cli depth json parser
Last synced: 5 days ago
JSON representation
a small command-line tool to walk through the depth levels of a JSON objects
- Host: GitHub
- URL: https://github.com/maxlath/jsondepth
- Owner: maxlath
- Created: 2016-04-28T12:06:20.000Z (over 8 years ago)
- Default Branch: main
- Last Pushed: 2021-09-14T07:34:04.000Z (about 3 years ago)
- Last Synced: 2024-10-02T20:17:50.787Z (about 1 month ago)
- Topics: cli, depth, json, parser
- Language: JavaScript
- Homepage:
- Size: 263 KB
- Stars: 11
- Watchers: 3
- Forks: 1
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
Awesome Lists containing this project
- awesome-starred - maxlath/jsondepth - a small command-line tool to walk through the depth levels of a JSON objects (json)
README
# jsondepth
A small command-line tool to walk through the depth levels of a json objects
`output json | jd =. =0`
## Summary
- [Motivation](#motivation)
- [Installation](#installation)
- [How-to](#how-to)
- [Specify a depth level](#specify-a-depth-level)
- [Specify a path](#specify-a-path)
- [Specify a depth and a path](#specify-a-depth-and-a-path)
- [Access JS objects attributes](#access-js-objects-attributes)
- [Native attributes](#native-attributes)
- [Arrays `length`](#arrays-length)
- [Special keys](#special-keys)
- [`_keys`](#_keys)
- [`_values`](#_values)
- [`_map`](#_map)
- [`_first`](#_first)
- [`_last`](#_last)
- [Format the output as valid JSON](#format-the-output-as-valid-json)
- [Parse newline delimited JSON](#parse-newline-delimited-json)
- [See also](#see-also)
## Motivation
Working with super deep json objects from the terminal is a pain, unless you use a good json parser.
[jq](https://github.com/stedolan/jq) is an awesome one, but doesn't handle object depths, afaik.
Here the idea is to **walk through a json object as you would read a summary**: level by level.
## Installation
```sh
npm install -g jsondepth
```
## How-to
real world example:
```sh
url='https://www.wikidata.org/w/api.php?action=wbgetentities&ids=Q1&format=json'
curl -s "$url" | jsondepth
```
logs the object with only the first-level keys and values:
```js
{ entities: [Object], success: 1 }
```
for the sake of convenience and lazyness, **jsondepth is aliased to jd**
(which, purposedly make it look a bit like jq)
```
curl -s "$url" | jd
```
### Specify a depth level
this is equivalent to the two previous one:
```
curl -s "$url" | jd 0
```
now let's go one-level deeper:
```sh
curl -s "$url" | jd 1
```
outputs:
```js
{ entities: { Q1: [Object] }, success: 1 }
```
```sh
curl -s "$url" | jd 2
curl -s "$url" | jd 3
curl -s "$url" | jd 4
# etc
```
If you use [paths](#specify-a-path), you may wish to disable object wrapping: this can be done by passing `-1`. The advantage is that you are sure to get back a valid json object.
```sh
curl -s "$url" | jd -1
```
### Specify a path
```sh
curl -s "$url" | jd entities.Q1.aliases.fi.1
# or to mimick jq syntax
curl -s "$url" | jd .entities.Q1.aliases.fi.1
# or with keys with spaces
curl -s "$url" | jd .entities.Q1.['a key with spaces']
```
### Specify a depth and a path
if both a path and a depth are specified, **path should come first, depth second**
```sh
curl -s "$url" | jd entities.Q1.claims.P31.0 3
```
### Access JS objects attributes
#### Native attributes
##### Arrays `length`
```sh
curl -s "$url" | jd entities.Q1.aliases.en.length
# => 5
```
#### Special keys
##### `_keys`
apply `Object.keys` to the final object
```sh
curl -s "$url" | jd entities._keys
# => ['Q1']
```
##### `_values`
apply `_.values` to an array
```sh
curl -s "$url" | jd entities._values
# => [{ id: 'Q1', etc...}]
curl -s "$url" | jd entities._values.0.id
# => 'Q1'
```
##### `_map`
map properties of an array
```sh
curl -s "$url" | jd entities._values._map.id
# => ['Q1']
```
##### `_first`
```sh
echo '["foo", "bar"]' | jd ._first
# => foo
```
##### `_last`
```sh
echo '["foo", "bar"]' | jd ._first
# => bar
```
### Format the output as valid JSON
Wrapped results like `{ entities: { Q1: [Object] }, success: 1 }` are more readible but aren't valid JSON. And sometimes, for whatever reason, you want a valid JSON output; there in a option for that: `--json|-j`
```
curl -s "$url" | jd entities.Q1.aliases --json
```
You can even specify the output indentation level (Between 0 and 9. Default: 2):
```
curl -s "$url" | jd entities.Q1.aliases --json=0
curl -s "$url" | jd entities.Q1.aliases --json=4
```
Notice that it disables the depth option as it's responsible for the wrapping mechanism.
### Parse newline delimited JSON
Add the `--line` option to parse the stdin line by line
```
curl https://some.ndjson.dump | jd --line .key
```
There is a tolerance for JSON lines ending by a comma, and any line that isn't starting by a `{` or a `}` is ignored.
## See also
* [jq](https://stedolan.github.io/jq/)
* [fx](https://github.com/antonmedv/fx)