API & OpenAPI utility

OpenAPI YAML to JSON

Convert an OpenAPI YAML document into formatted JSON.

● This tool runs entirely in your browser. Your input is never uploaded to our servers.

OpenAPI YAML or JSON

Output

Your result will appear here…

How to use OpenAPI YAML to JSON

Paste an OpenAPI YAML document.
Select Convert to parse YAML and serialize JSON.
Copy the result for JSON-based tooling.

Example

Input:

openapi: 3.0.3
info:
  title: Example API
  version: 1.0.0
paths: {}

Output:

{
  "openapi": "3.0.3",
  "info": {
    "title": "Example API",
    "version": "1.0.0"
  },
  "paths": {}
}

Use cases

Prepare YAML APIs for JSON-only tools.
Compare representations of a specification.
Convert a local API contract for a test fixture.

About this tool

Convert an OpenAPI YAML document into formatted JSON. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.

Frequently asked questions

Does it resolve $ref values?

No. References are kept as written and no external documents are requested.

Must the YAML be a valid OpenAPI document?

The converter parses YAML; use the validator to check essential OpenAPI fields.

Is conversion private?

Yes. The document is converted locally.