OpenAPI to YAML Converter

What Does This Tool Do?

This tool takes an OpenAPI document written in JSON and converts it to YAML, which many teams prefer for its more compact, readable format and easier diffs in version control.

Why Use This Tool?

Useful when migrating an OpenAPI file from JSON to YAML for a documentation tool, or simply to make a machine-generated JSON specification easier for a human to review.

How to Use the OpenAPI to YAML Converter

1. Paste your OpenAPI document in JSON.
2. Click Convert to see the formatted YAML output.
3. Copy the result.

Related Tools

Need to go the other direction? Use the OpenAPI to JSON Converter. To check the document's structure first, use the OpenAPI/Swagger Validator.

Example

{"openapi":"3.0.3","info":{"title":"Orders API","version":"1.0.0"},"paths":{"/orders/{id}":{"get":{"parameters":[{"name":"id","in":"path","required":true,"schema":{"type":"integer"}}]}}}}

becomes:

openapi: 3.0.3
info:
  title: Orders API
  version: 1.0.0
paths:
  /orders/{id}:
    get:
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: integer

Why Teams Prefer YAML for Specs

• Shorter: no braces or quotes around every key - large specs become much easier to scroll.
• Comments: you can explain design decisions with # comments.
• Clean diffs: one change is usually one line in a pull request.

Tips After Converting

• Split very large specs into files with $ref: './schemas/order.yaml'.
• Keep response codes quoted ('200':) if you edit by hand.
• Run the spec through a linter or validator in CI so broken references are caught early.

Validate with the OpenAPI Validator, and name endpoints consistently with the API Endpoint Naming Generator. See also REST API naming conventions.