RSS Atom Feed Validator API

API ID 14324

One GET, one graded JSON report: a headless RSS/Atom/JSON Feed validator for CI checks, publishing pipelines and feed directories. Give it a feed URL (or a website that links to its feed) and get a

API Documentation

Endpoints

Request
Validates the RSS, Atom or JSON Feed at a URL, or a web page that links to a feed, and returns the detected format, well-formedness checks, required and recommended element checks, a grade, a score and coded issues.
Endpoint ID: 35909
GET https://zylalabs.com/api/14324/rss+atom+feed+validator+api/35909/validate+rss+atom+feed+at+a+url
INPUT PARAMETERS

Validate RSS Atom feed at a URL — Endpoint Features

Object Description
url Required Feed URL or a web page that links to its feed. Aliases u, uri, link, target, site, website, domain and host are also accepted (case-insensitive).
fresh Optional Set to 1 to bypass the result cache.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

url
fresh
API EXAMPLE RESPONSE
XML
{
    "url": "https://hnrss.org/frontpage",
    "finalUrl": "https://hnrss.org/frontpage",
    "statusCode": 200,
    "contentType": "application/xml",
    "discoveredFrom": null,
    "cached": false,
    "checkedAt": "2026-10-19T19:28:12.602Z",
    "note": "Only the feed document is read. Feed items' linked pages, enclosure files and images are not requested. Feeds generated by JavaScript are not seen.",
    "found": true,
    "format": "rss2.0",
    "feed": {
        "title": "Hacker News: Front Page",
        "link": "https://news.ycombinator.com/",
        "description": "Hacker News RSS",
        "language": null,
        "updated": "Mon, 19 Oct 2026 19:14:55 +0000",
        "itemCount": 20
    },
    "grade": "A+",
    "score": 98,
    "summary": {
        "errors": 0,
        "warnings": 0,
        "infos": 2
    },
    "issues": [
        {
            "severity": "info",
            "code": "xml_declaration_missing",
            "message": "No <?xml version=\"1.0\" encoding=\"UTF-8\"?> declaration."
        },
        {
            "severity": "info",
            "code": "language_missing",
            "message": "The channel has no <language>."
        }
    ]
}
Validate RSS Atom feed at a URL — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14324/rss+atom+feed+validator+api/35909/validate+rss+atom+feed+at+a+url?url=https://hnrss.org/frontpage' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
Offline validation, no outbound request. Send the feed as XML text, JSON Feed text or a JSON Feed object in the feed field. Maximum 1 MB.
Endpoint ID: 35910
POST https://zylalabs.com/api/14324/rss+atom+feed+validator+api/35910/validate+feed+text+you+send+in
INPUT PARAMETERS

Validate feed text you send in — Endpoint Features

Object Description
Request Body Required Json

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

API EXAMPLE RESPONSE
JSON
{
    "found": true,
    "format": "rss2.0",
    "feed": {
        "title": "Example",
        "link": "https://example.com",
        "description": "Example feed",
        "language": null,
        "updated": null,
        "itemCount": 1
    },
    "grade": "A",
    "score": 96,
    "summary": {
        "errors": 0,
        "warnings": 0,
        "infos": 4
    },
    "issues": [
        {
            "severity": "info",
            "code": "last_build_date_missing",
            "message": "The channel has no <lastBuildDate>; readers use it to skip unchanged feeds."
        },
        {
            "severity": "info",
            "code": "language_missing",
            "message": "The channel has no <language>."
        },
        {
            "severity": "info",
            "code": "atom_self_link_missing",
            "message": "No <atom:link rel=\"self\"> in the channel; recommended so readers know the feed's own address."
        },
        {
            "severity": "info",
            "code": "item_pubdate_missing",
            "message": "No item has a <pubDate>; readers cannot sort or date the items."
        }
    ],
    "checkedAt": "2026-10-19T19:28:14.628Z"
}
Validate feed text you send in — CODE SNIPPETS

curl --location --request POST 'https://zylalabs.com/api/14324/rss+atom+feed+validator+api/35910/validate+feed+text+you+send+in' --header 'Authorization: Bearer YOUR_API_KEY' 

--data-raw '{"feed":"Examplehttps://example.comExample feedHellohttps://example.com/hellohttps://example.com/hello"}'

    

API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the RSS Atom Feed Validator API simply include your bearer token in the Authorization header.

Headers
Header Description
Authorization Required Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.

Starts at
$10,000/Year


  • Custom Volume
  • Custom Rate Limit
  • Specialized Customer Support
  • Real-Time API Monitoring

Overview

One GET, one graded JSON report: a headless RSS/Atom/JSON Feed validator for CI checks, publishing pipelines and feed directories. Give it a feed URL (or a website that links to its feed) and get a

RSS Atom Feed Validator API FAQs

A graded JSON report for a feed: the detected format, XML well-formedness checks, required and recommended element checks, a grade from A plus to F, a score and coded issues you can gate a CI build on.

Yes. Send the feed text in the validate endpoint and it is checked offline without any outbound request. The maximum size is 1 MB.

RSS 2.0, Atom and JSON Feed. The report states the detected format and checks the elements each format requires or recommends.

Gate on the errors count in the summary. One error alone lowers the score to 75, so the letter grade alone is not a reliable pass or fail signal.

Yes. Results for a feed URL are cached for a short time. Add the fresh parameter set to 1 to bypass the cache.

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