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# Package URL (purl) Parser

Parse purl identifiers against each ecosystem's rules, see exactly which part breaks, and build a valid purl back up from its parts.

Paste purls to validate them.

Validation runs against the purl spec's grammar plus a bundled table of per-type rules: npm scopes keep their %40 encoding, maven group ids use slashes, PyPI names fold to PEP 503. Warnings are things the canonical form quietly changes; errors are things no canonical form can fix. A valid purl means the identifier is well formed, not that the package exists in a registry.
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## More regex & cron tools

- [SBOM validator](/json/cyclonedx-validator)
- [Semver compare](/dev/semver)
- [JSON validator](/json/validator)
[All regex & cron tools](/dev)

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Canonical HTML: https://nutter.tools/dev/package-url-parser
Markdown version: https://nutter.tools/dev/package-url-parser.md
Plain-text version: https://nutter.tools/dev/package-url-parser.txt
Agent index: https://nutter.tools/llms.txt