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OpenAPI validator

Run bounded local structural checks on an OpenAPI 3 JSON document without resolving references.

Checks a bounded local structural subset of OpenAPI 3.0/3.1 JSON. YAML and remote $ref resolution are not supported.
Structural check preview124 characters
OpenAPI version: 3.0.3
Title: Notes API
Paths: 1

Valid local structural checks:
Required root, info and path checks passed.
Processed on your device

How it works & useful details

Local-only workspace

This tool converts or inspects pasted text in your browser. It never sends a request, opens a URL, uploads a HAR, or stores your input.

Bounded structural checks

This checker accepts JSON OpenAPI 3.0/3.1 documents and checks the required root, info, path, operation and responses shapes. It does not resolve $ref entries, parse YAML, contact servers, or certify a contract.