API & OpenAPI utility

OpenAPI JSON to YAML

Convert an OpenAPI JSON document into readable YAML.

● 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 JSON to YAML

Paste a valid OpenAPI JSON document.
Select Convert to serialize it as YAML.
Copy the YAML into your API project.

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

Move JSON API contracts to YAML workflows.
Create a readable API contract for review.
Convert test fixtures for YAML tooling.

About this tool

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

Frequently asked questions

Does it validate the API document?

It parses JSON but does not perform full OpenAPI schema validation.

Are references fetched?

No. $ref values remain unchanged and no network requests are made.

Does the JSON leave my browser?

No. Conversion happens locally.