OpenAPI (Swagger) Validator

Paste YAML/JSON or batch upload files. Validate OpenAPI 3.x & Swagger 2.0, detect broken internal $ref, and export reports.

100% Secure. Processed locally.
Click or drag OpenAPI files here
Errors
0
Warnings
0
Operations
0

Waiting for input

Paste a spec or upload files, then click Validate.

How to use

1

Input

Paste YAML/JSON, or upload multiple files.

2

Validate

See errors/warnings and a normalized JSON view.

3

Export

Download per-file reports or export all at once.

FAQ

Is it private?
Yes. Everything runs locally in your browser—no uploads.
Does it support Swagger 2.0?
Yes. The validator detects OpenAPI 3.x via openapi and Swagger 2.0 via swagger: "2.0".