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BCP 47 Language Tag Parser and Validator
x402
BCP 47 Language Tag Parser and Validator is a paid API for AI agents from fittings.sh, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Parses a BCP 47 language tag into its subtag components (language, extlang, script, region, variant, extension, private-use), validates each against the IANA registry, and returns the canonical form.
Price / call$0.003
Success—
StatusUnknown
How this service works
Parses a BCP 47 language tag into language, extlang, script, region, variant, extension and private-use subtags, validates each against the IANA registry, and returns the canonical form.
Output
Returns the parsed BCP 47 tag broken into its subtag components (language, extlang, script, region, variant, extension, private-use), a validation status for each against the IANA registry, and the canonical normalized form of the full tag.
Example use cases
Validate locale tags before shipping
“I need to check whether 'sr-Latn-RS' is a valid BCP 47 language tag and see its canonical form — can you parse it into its subtags and confirm each one is registered with IANA?”
Canonicalize malformed language codes
“Our database has the language tag 'ZH-hant-hk' stored in mixed case — can you parse it and return the correctly canonicalized BCP 47 form?”
Debug an i18n configuration error
“We're getting a locale error in our app for the tag 'en-US-u-ca-buddhist' — can you break it down into its BCP 47 components and validate each subtag against the IANA registry?”
Technical details
Endpoint
GEThttps://fittings.sh/v1/lang/bcp47When to prefer
Choose this endpoint when you need authoritative BCP 47 parsing and IANA validation in a single call — especially useful for i18n pipelines, locale configuration validation, or any system that must accept and normalize user-supplied language tags. Prefer it over regex-based validation when correctness against the actual IANA registry matters.
Side effects
- Tag exceeds 100 characters — request rejected
- Malformed tag that cannot be parsed into BCP 47 structure — error returned
- Unrecognized subtag not found in IANA registry — validation failure indicated
- Empty or missing 'tag' query parameter — bad request error
- Network timeout or service unavailability — HTTP 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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