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OpenAPI / Swagger Spec Conversion

Convert OpenAPI 3.x or Swagger 2.0 API specifications between YAML and JSON. Both formats are valid and interchangeable.

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OpenAPI / Swagger tips

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The OpenAPI spec supports both YAML and JSON. YAML is preferred for hand-written specs (more readable); JSON is preferred for programmatic generation.

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Many code generators (e.g., openapi-generator-cli) accept both formats. Convert if your CI requires one specific format for consistency.

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Swagger Hub and SwaggerUI render both formats identically. Conversion is useful when sharing specs with teams that have different format preferences.

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Use the conversion to validate spec structure β€” YAML can hide schema issues that become obvious in JSON's explicit braces and quoted strings.

How It Works

1
Enter
Enter your data into the tool above. Everything stays local to your browser.
2
Process
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
Download
Get your result instantly. Nothing is stored after you leave the page β€” complete privacy.

Why use ours?

βœ“Completely free β€” no hidden costs, ever
βœ“No account, email, or login required
βœ“Files never leave your device
βœ“No file size limits whatsoever
βœ“No watermarks on any output

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Frequently Asked Questions