Does this OpenAPI validator upload my document?

No. JSON/YAML parsing and validation run in the current browser tab. Pasted text and selected local files are not sent to Quick Test Hub or a third party.

Which OpenAPI versions does it validate?

This focused checker recognizes OpenAPI 3.0 and 3.1 documents and checks common structure, paths, operations, responses, components, and references.

Is this an official OpenAPI validator?

No. It is a practical browser-side checker for common errors, not an official replacement for the OpenAPI specification, vendor rules, or a CI validator library.

Can I download a validation report?

Yes. After validation you can copy or download a Markdown report and a JSON issue report.

OpenAPI validator · Volume 320 · KD 24%

OpenAPI Validator

Paste or upload OpenAPI 3.0 or 3.1 JSON/YAML and get a practical validation report with line numbers, JSON paths, severity, and repair guidance.

Validate a document Read the error guide

Local validation: Documents stay in this browser tab. This is a focused checker, not an official OpenAPI validator or a substitute for CI/vendor-specific rules.

3.03.1PATHFIX

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Actionable issues

See what failed, where it failed, and what to review next.

Browser-side checker

Find common OpenAPI errors before mock or contract tests.

Checks syntax, version, required top-level fields, paths, operations, response codes, components, and obvious remote-reference risks.

Validation reportREADY

Validate a document to see issues with line, path, severity, and fix guidance.

Validation path

Validate → mock → contract → integration.

Use this page to catch common structural mistakes, then hand the document to the tool that matches the next step.

1. Generate a mock

Turn valid paths and examples into local route fixtures and request snippets.

2. Compare contracts

Check likely breaking changes between an older and newer schema or OpenAPI component.

3. Test integration

Exercise a deployed endpoint and record status, latency, assertions, and response evidence.

4. Create fixtures

Generate fictional test data for examples, edge cases, and repeatable QA runs.

What does an OpenAPI validator check?

This focused checker verifies that the document declares OpenAPI 3.0 or 3.1, has usable info and paths objects, uses valid HTTP operations, declares responses, and keeps common components and references in expected shapes.

Common OpenAPI errors

Invalid JSON or malformed YAML indentation.
Missing or unsupported openapi version.
Missing info.title, info.version, or paths.
Path keys without a leading slash, unknown operation keys, or operations without responses.
Response keys that are not HTTP status codes or default.
Remote $ref URLs that can make builds non-reproducible or require network access.

OpenAPI validator scope and disclaimer

This page is not the official OpenAPI Spec Validator, Swagger Editor, or a vendor-specific rules engine. It does not claim complete JSON Schema, security, lint, or extension coverage. Run your organization’s authoritative validator and CI checks before release.

OpenAPI validator FAQ

Does validation upload my file?

No. The page performs parsing and checks locally. Avoid pasting secrets or proprietary contracts into any browser tool unless your policy allows it.

Does it validate OpenAPI 3.1?

Yes, it recognizes 3.1.x and runs the same focused structural checks. Vendor extensions and full JSON Schema dialect behavior still require an authoritative validator.

Can I use the report in a pull request?

Yes. Copy or download Markdown for review notes, or download JSON when another local script needs machine-readable issue data.