API & OpenAPI utility

OpenAPI Formatter

Format OpenAPI documents as readable JSON or 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 Formatter

Paste an OpenAPI document in YAML or JSON.
Select Format to parse and normalize it.
Copy the formatted document in its original format.

Example

Input:

openapi: 3.0.3
info:
  title: Example API
  version: 1.0.0
paths:
  /health:
    get:
      responses:
        '200':
          description: OK

Output:

openapi: 3.0.3
info:
  title: Example API
  version: 1.0.0
paths:
  /health:
    get:
      responses:
        "200":
          description: OK

Use cases

Clean up an API specification.
Improve readability before code review.
Normalize indentation for source control.

About this tool

Format OpenAPI documents as readable JSON or YAML. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.

Frequently asked questions

Does formatting change the API behavior?

It parses and serializes the document; review scalar types and comments because comments and formatting may not be preserved.