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https://github.com/ericnorris/striptags
An implementation of PHP's strip_tags in Typescript.
https://github.com/ericnorris/striptags
html node strip-tags striptags xss
Last synced: about 2 months ago
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An implementation of PHP's strip_tags in Typescript.
- Host: GitHub
- URL: https://github.com/ericnorris/striptags
- Owner: ericnorris
- License: mit
- Created: 2014-06-28T01:36:02.000Z (about 10 years ago)
- Default Branch: main
- Last Pushed: 2022-10-04T22:00:45.000Z (almost 2 years ago)
- Last Synced: 2024-04-07T04:41:32.245Z (6 months ago)
- Topics: html, node, strip-tags, striptags, xss
- Language: TypeScript
- Homepage:
- Size: 171 KB
- Stars: 488
- Watchers: 10
- Forks: 53
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Security: SECURITY.md
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README
# striptags
An implementation of PHP's [strip_tags](https://www.php.net/manual/en/function.strip-tags.php) in Typescript.
**Note:** this is a total rewrite from [v3](https://github.com/ericnorris/striptags/tree/v3.x.x), and as such, is currently in an alpha state. Feel free to use this during the alpha period and provide feedback before it is released as v4.
## Highlights
- No dependencies
- Prevents XSS by default
## Installing
```
npm install striptags@alpha
```
## Basic Usage
```typescript
striptags(text: string, options?: Partial): string;
```
### Examples
```javascript
// commonjs
const striptags = require("striptags").striptags;
// alternatively, as an es6 import
// import { striptags } from "striptags";
var html = `
lorem ipsum dolor sit amet
`.trim();
console.log(striptags(html));
console.log(striptags(html, { allowedTags: new Set(["strong"]) }));
console.log(striptags(html, { tagReplacementText: "🍩" }));
```
Outputs:
```
lorem ipsum dolor sit amet
lorem ipsum dolor sit amet
🍩lorem ipsum 🍩dolor🍩 🍩sit🍩 amet🍩
```
## Advanced Usage
```typescript
class StateMachine {
constructor(partialOptions?: Partial);
consume(text: string): string;
}
```
The `StateMachine` class is similar to the `striptags` function, but persists state across calls to `consume()` so that you may safely pass in a stream of text. For example:
```javascript
// commonjs
const StateMachine = require("striptags").StateMachine;
// alternatively, as an es6 import
// import { StateMachine } from "striptags";
const instance = new StateMachine();
console.log(instance.consume("some text with and more text"));
```
Outputs:
```
some text with and more text
```
## Safety
`striptags` is safe to use by default; the output is guaranteed to be free of potential XSS vectors if used as text within a tag. **Specifying either `allowedTags` or `disallowedTags` in the options argument removes this guarantee**, however. For example, a malicious user may achieve XSS via an attribute in an allowed tag: `![]()
`.
In addition, `striptags` will automatically HTML encode `<` and `>` characters followed by whitespace. While most browsers tested treat `<` or `>` followed by whitespace as a non-tag string, it is safer to escape the characters. You may change this behavior via the `encodePlaintextTagDelimiters` option described below.
## `Partial`
**`allowedTags?: Set`**
A set containing a list of tag names to allow (e.g. `new Set(["tagname"])`). Tags not in this list will be removed. This option takes precedence over the `disallowedTags` option.
Default: `undefined`
**`disallowedTags?: Set`**
A set containing a list of tag names to disallow ((e.g. `new Set(["tagname"])`). Tags not in this list will be allowed. Ignored if `allowedTags` is set.
Default: `undefined`
**`tagReplacementText?: string`**
A string to use as replacement text when a tag is found and not allowed.
Default: `""`
**`encodePlaintextTagDelimiters?: boolean`**
Setting this option to true will cause `<` and `>` characters immediately followed by whitespace to be HTML encoded. This is safe to set to `false` if the output is expected to be used only as plaintext (i.e. it will not be displayed alongside other HTML).
Default: `true`