Atom feed validator: validate and fix broken Atom feeds
An Atom feed validator helps you check whether an Atom feed is actually healthy enough for readers, apps, and other clients to trust.
A useful Atom validator should help you catch problems like:
- malformed XML
- stale
<updated>timestamps - unstable entry
<id>values - broken or missing feed URLs
- redirects that never settle cleanly
- feed output that looks fine in a browser but fails in real consumers
Quick answer
If an Atom feed is broken or seems stale, validate the live Atom feed URL first.
That tells you whether the production feed:
- returns
200 - serves Atom XML instead of HTML
- parses correctly
- uses stable update and entry signals
- resolves cleanly without redirect or caching issues
Use the validator here:
What an Atom feed validator should check
A good Atom validator should help with more than just syntax.
1. Reachability
Can the feed URL actually be fetched?
Common failures:
- 404 Not Found
- auth or block-page responses
- feed path changed
- proxy or CDN issues
2. XML validity
Can the Atom feed be parsed as XML?
Common failures:
- unescaped characters
- malformed tags
- bad encoding
- broken CDATA or embedded markup
3. Atom-specific update signals
Does the feed use <updated> values correctly, and do they actually change when content changes?
4. Stable entry identity
Do entry <id> values stay persistent, or are they changing in a way that confuses readers?
5. Redirect and caching behavior
Does the feed resolve cleanly, and are clients seeing the fresh version instead of a stale cached body?
When to use an Atom feed validator
Use a validator when:
- the Atom feed stopped updating
- an app says the feed is broken
- the feed looks stale after publishing
- a migration changed the feed path
- you changed caching, CDN, or proxy behavior
- you want to validate after deployment
What to do after validation
The next step depends on the first problem the validator finds.
If the Atom feed seems stale
Go here:
If the feed returns 404
Go here:
If the feed has invalid XML
Go here:
If the feed has too many redirects
Go here:
Best validation workflow
- validate the live Atom feed URL
- fix the first reported problem
- validate again
- repeat until the feed resolves cleanly and parses correctly
This matters because one broken parser or delivery issue often hides the next problem.
Atom validator vs Atom fixer
A validator helps you identify what is broken.
A fixer helps you move from diagnosis into repair.
CorrectFeed is meant to support both parts of that workflow:
- validate first
- then fix the exact issue blocking delivery or updates
Keep Atom validation practical
The point is not to chase perfect output for its own sake.
The point is to make sure:
- readers can fetch the feed
- clients can parse it
- updates actually propagate
- the feed stays reliable over time
If you want to validate an Atom feed now, use:
FAQ
What does an Atom feed validator check?
An Atom feed validator checks whether the feed is reachable, valid XML, structurally correct, and free of common Atom problems like stale updated timestamps, unstable entry IDs, redirects, or malformed metadata.
Why validate an Atom feed if it loads in a browser?
Because a feed can look readable in a browser but still fail in actual readers due to XML, timestamp, ID, caching, or structural problems.
What should I fix first after validating an Atom feed?
Start with the first reported issue. Common first fixes include correcting malformed XML, repairing stale updated timestamps, stabilizing entry IDs, or resolving redirect and caching problems.
Fix RSS/Atom feeds and OPML lists
Paste a feed/OPML URL, upload a file, or paste XML — then validate and fix it.