Atom Validator

Tool to validate Atom feeds for conformance to RFC 4287, helping developers and publishers ensure well-formed feeds before distribution.

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About This Tool

This tool validates Atom feeds against RFC 4287 with a focus on structural integrity and conformance. It accepts Atom XML as input and returns a structured report detailing errors, warnings, and validity gaps that could affect feed consumption. Conceptually, the validator parses the XML, verifies required elements at the feed level (id, title, updated) and at each entry (id, title, updated), ensures unique IDs, and checks dates against RFC 3339. It also confirms correct namespace usage and UTF-8 encoding. The primary beneficiaries are backend developers, content publishers, and QA teams who rely on reliable feed ingestion. A key differentiator is precise, line-level reporting and automation-friendly outputs suitable for CI pipelines. Core features include well-formedness checks, RFC 4287 conformance tests, duplicate detection, and RFC 3339 date validation, with optional batch validation and exportable results. Use cases include pre-deployment validation of newsroom feeds, podcast feeds, and content aggregators, as well as ongoing monitoring of live feeds.

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How to Use

Provide inputs: paste Atom feed XML or supply a feed file.
Run validation: the tool analyzes structure and RFC 4287 conformance in real time.
Review outputs: inspect errors, warnings, line/column references, and suggested fixes.
Apply fixes: correct identified issues in the feed XML and re-validate.
Export report: save or copy the validation results for CI integration or auditing.

Frequently Asked Questions

Find Quick Answers

What is a valid Atom feed?

An Atom feed is an XML document conforming to RFC 4287 that includes a feed element with required fields (id, title, updated) and zero or more entry elements, each with id, title, and updated. The validator checks these core requirements and namespace usage.

What issues does the validator report?

It reports missing required elements, duplicate entry IDs, invalid RFC 3339 dates, ill-formed XML, encoding problems (non-UTF-8), and namespace mismatches, along with actionable remediation guidance.

Can the tool handle large feeds?

Yes, it processes typical feed sizes efficiently and reports scalable results. For extremely large feeds, consider batch validation or streaming options, while the current report remains deterministic for the input provided.

Does it validate feed content semantics?

The validator focuses on structural conformance to RFC 4287. It does not assess content semantics or business logic within entries, but flags structural issues that could affect parsing by feed readers.

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