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Package Name Validator & Normalizer
x402
Package Name Validator & Normalizer is a paid API for AI agents from fittings.sh, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-11).
Checks a proposed package name against npm, PyPI, or crates.io naming rules and returns the canonical normalized form used by that registry.
Price / call$0.004
Success—
StatusUnknown
How this service works
Checks a proposed package name against a registry’s own naming rules (npm scoping and URL-safety, PEP 503 normalization for PyPI, cargo’s crate name grammar) and returns the normalized form the registry compares by.
Output
Returns whether the proposed package name is valid under the selected registry's naming rules, along with the normalized/canonical form that the registry compares by (e.g. lowercased, hyphen-normalized per PEP 503 for PyPI; scoped and URL-safe for npm; identifier-grammar-compliant for crates.io).
Example use cases
Pre-publish npm package name check
“I want to publish a new npm package called '@myorg/data-utils' — can you confirm that name is valid and URL-safe for npm?”
PyPI PEP 503 normalization lookup
“What does PyPI normalize 'My_Awesome.Package' to? I want to know the canonical name it'll use when people search for it.”
Crates.io crate name grammar check
“Can you check if 'my-rust-crate_v2' is a valid crate name for crates.io before I try to publish it?”
Technical details
Endpoint
GEThttps://fittings.sh/v1/pkg/name-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify package names before publishing or registering packages on npm, PyPI, or crates.io — especially in CI pipelines, publishing automation, or when building tooling that needs to know the canonical comparison key a registry uses. Prefer this over manual regex checks because it encodes each registry's exact current rules (npm scoping and URL-safety, PEP 503 normalization, cargo grammar) in one call.
Side effects
- Name exceeds 300 characters — request rejected
- Invalid registry value provided — defaults to npm or returns error
- Name contains characters that cannot be normalized — validation fails with reason
- Missing required 'name' query parameter — returns 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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Zero review prompt (fires after every successful call)
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