feed-extractor

To read & normalize RSS/ATOM/JSON feed data.

(This library is derived from feed-reader renamed.)

Demo

• Give it a try!
• Example FaaS

Install & Usage

Node.js

1npm i @extractus/feed-extractor

1import { extract } from '@extractus/feed-extractor'
2
3// extract a RSS
4const result = await extract('https://news.google.com/rss')
5console.log(result)

Deno

1import { extract } from 'npm:@extractus/feed-extractor'

Browser

1import { extract } from 'https://esm.sh/@extractus/feed-extractor'

Please check the examples for reference.

Automate RSS feed extraction with GitHub Actions

RSS Feed Fetch Action is a GitHub Action designed to automate the fetching of RSS feeds. It fetches an RSS feed from a given URL and saves it to a specified file in your GitHub repository. This action is particularly useful for populating content on GitHub Pages websites or other static site generators.

CJS Deprecated

CJS is deprecated for this package. When calling require('@extractus/feed-extractor') a deprecation warning is now logged. You should update your code to use the ESM export.

• You can ignore this warning via the environment variable FEED_EXTRACTOR_CJS_IGNORE_WARNING=true
• To see where the warning is coming from you can set the environment variable FEED_EXTRACTOR_CJS_TRACE_WARNING=true

APIs

• extract()
• extractFromJson()
• extractFromXml()

Note:

• Old method read() has been marked as deprecated and will be removed in next major release.

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extract()

Load and extract feed data from given RSS/ATOM/JSON source. Return a Promise object.

Syntax

1extract(String url)
2extract(String url, Object parserOptions)
3extract(String url, Object parserOptions, Object fetchOptions)

Example:

1import { extract } from '@extractus/feed-extractor'
2
3const result = await extract('https://news.google.com/atom')
4console.log(result)

Without any options, the result should have the following structure:

1{
2  title: String,
3  link: String,
4  description: String,
5  generator: String,
6  language: String,
7  published: ISO Date String,
8  entries: Array[
9    {
10      id: String,
11      title: String,
12      link: String,
13      description: String,
14      published: ISO Datetime String
15    },
16    // ...
17  ]
18}

Parameters

url required

URL of a valid feed source

Feed content must be accessible and conform one of the following standards:

• RSS Feed
  • RDF Feed
• ATOM Feed
• JSON Feed

parserOptions optional

Object with all or several of the following properties:

• normalization: Boolean, normalize feed data or keep original. Default true.
• useISODateFormat: Boolean, convert datetime to ISO format. Default true.
• descriptionMaxLen: Number, to truncate description. Default 250 characters. Set to 0 = no truncation.
• xmlParserOptions: Object, used by xml parser, view fast-xml-parser's docs
• getExtraFeedFields: Function, to get more fields from feed data
• getExtraEntryFields: Function, to get more fields from feed entry data
• baseUrl: URL string, to absolutify the links within feed content

For example:

1import { extract } from '@extractus/feed-extractor'
2
3await extract('https://news.google.com/atom', {
4  useISODateFormat: false
5})
6
7await extract('https://news.google.com/rss', {
8  useISODateFormat: false,
9  getExtraFeedFields: (feedData) => {
10    return {
11      subtitle: feedData.subtitle || ''
12    }
13  },
14  getExtraEntryFields: (feedEntry) => {
15    const {
16      enclosure,
17      category
18    } = feedEntry
19    return {
20      enclosure: {
21        url: enclosure['@_url'],
22        type: enclosure['@_type'],
23        length: enclosure['@_length']
24      },
25      category: isString(category) ? category : {
26        text: category['@_text'],
27        domain: category['@_domain']
28      }
29    }
30  }
31})

fetchOptions optional

fetchOptions is an object that can have the following properties:

• headers: to set request headers
• proxy: another endpoint to forward the request to
• agent: a HTTP proxy agent
• signal: AbortController signal or AbortSignal timeout to terminate the request

For example, you can use this param to set request headers to fetch as below:

1import { extract } from '@extractus/feed-extractor'
2
3const url = 'https://news.google.com/rss'
4await extract(url, null, {
5  headers: {
6    'user-agent': 'Opera/9.60 (Windows NT 6.0; U; en) Presto/2.1.1'
7  }
8})

You can also specify a proxy endpoint to load remote content, instead of fetching directly.

For example:

1import { extract } from '@extractus/feed-extractor'
2
3const url = 'https://news.google.com/rss'
4
5await extract(url, null, {
6  headers: {
7    'user-agent': 'Opera/9.60 (Windows NT 6.0; U; en) Presto/2.1.1'
8  },
9  proxy: {
10    target: 'https://your-secret-proxy.io/loadXml?url=',
11    headers: {
12      'Proxy-Authorization': 'Bearer YWxhZGRpbjpvcGVuc2VzYW1l...'
13    }
14  }
15})

Passing requests to proxy is useful while running @extractus/feed-extractor on browser. View examples/browser-feed-reader as reference example.

Another way to work with proxy is use agent option instead of proxy as below:

1import { extract } from '@extractus/feed-extractor'
2
3import { HttpsProxyAgent } from 'https-proxy-agent'
4
5const proxy = 'http://abc:RaNdoMpasswORd_country-France@proxy.packetstream.io:31113'
6
7const url = 'https://news.google.com/rss'
8
9const feed = await extract(url, null, {
10  agent: new HttpsProxyAgent(proxy),
11})
12console.log('Run feed-extractor with proxy:', proxy)
13console.log(feed)

For more info about https-proxy-agent, check its repo.

By default, there is no request timeout. You can use the option signal to cancel request at the right time.

The common way is to use AbortControler:

1const controller = new AbortController()
2
3// stop after 5 seconds
4setTimeout(() => {
5  controller.abort()
6}, 5000)
7
8const data = await extract(url, null, {
9  signal: controller.signal,
10})

A newer solution is AbortSignal's timeout() static method:

1// stop after 5 seconds
2const data = await extract(url, null, {
3  signal: AbortSignal.timeout(5000),
4})

For more info:

• AbortController constructor
• AbortSignal: timeout() static method

extractFromJson()

Extract feed data from JSON string. Return an object which contains feed data.

Syntax

1extractFromJson(String json)
2extractFromJson(String json, Object parserOptions)

Example:

1import { extractFromJson } from '@extractus/feed-extractor'
2
3const url = 'https://www.jsonfeed.org/feed.json'
4// this resource provides data in JSON feed format
5// so we fetch remote content as json
6// then pass to feed-extractor
7const res = await fetch(url)
8const json = await res.json()
9
10const feed = extractFromJson(json)
11console.log(feed)

Parameters

json required

JSON string loaded from JSON feed resource.

parserOptions optional

See parserOptions above.

extractFromXml()

Extract feed data from XML string. Return an object which contains feed data.

Syntax

1extractFromXml(String xml)
2extractFromXml(String xml, Object parserOptions)

Example:

1import { extractFromXml } from '@extractus/feed-extractor'
2
3const url = 'https://news.google.com/atom'
4// this resource provides data in ATOM feed format
5// so we fetch remote content as text
6// then pass to feed-extractor
7const res = await fetch(url)
8const xml = await res.text()
9
10const feed = extractFromXml(xml)
11console.log(feed)

Parameters

xml required

XML string loaded from RSS/ATOM feed resource.

parserOptions optional

See parserOptions above.

Test

1git clone https://github.com/extractus/feed-extractor.git
2cd feed-extractor
3pnpm i
4pnpm test

Quick evaluation

1git clone https://github.com/extractus/feed-extractor.git
2cd feed-extractor
3pnpm i
4pnpm eval https://news.google.com/rss

License

The MIT License (MIT)

Support the project

If you find value from this open source project, you can support in the following ways:

• Give it a star ⭐
• Buy me a coffee: https://paypal.me/ndaidong 🍵
• Subscribe Feed Reader service on RapidAPI 😉

Thank you.

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