JSON to YAML

YAML limits

Output is plain YAML. Anchors, aliases, and custom tags are not emitted.

Developer Quick Tips

• Paste JSON, press Ctrl/Cmd+Enter, download as yml file for docker-compose.yml, Kubernetes manifests, or Helm values.
• Safe YAML subset: block-style objects, arrays, strings, numbers, booleans, null. No anchors, aliases, or custom tags emitted.
• Convert JSON to YAML entirely in your browser. Input never leaves your device or DevToolMate servers.
• Transform JSON API specs to YAML format for Swagger, OpenAPI, and config file review side-by-side.
• Supports any valid JSON: objects, arrays, strings, numbers, booleans, null. Format conversion only, no validation.

Frequently asked questions

How do I convert JSON to YAML online?

Paste your JSON into the editor, press Ctrl/Cmd+Enter, and the tool converts it to YAML instantly in your browser. Download as a yml file or copy the output directly.

What is a JSON to YAML converter used for?

A JSON to YAML converter transforms JSON objects and arrays into YAML format for use in config files like docker-compose.yml, Kubernetes manifests, Helm values, Swagger specs, and GitLab CI pipelines. YAML is more human-readable for configuration management.

Can I convert JSON to YAML for Docker Compose?

Yes. Paste your JSON config, press Ctrl/Cmd+Enter, then download as a yml file or copy the output directly into your docker-compose.yml. Output is plain YAML without anchors or aliases, compatible with Docker Compose.

How do I convert JSON to YAML for Kubernetes and Helm?

Paste your JSON manifest or values file, convert to YAML in your browser, then download or copy into your Kubernetes YAML or Helm values.yaml. Output is plain YAML compatible with kubectl and Helm.

Can I convert JSON to YAML for Swagger and OpenAPI?

Yes. Convert JSON API specifications to YAML format for Swagger and OpenAPI definitions. Output is plain YAML compatible with Swagger editors and OpenAPI parsers.

Does JSON to YAML upload my data to servers?

No. JSON to YAML runs entirely in your browser. Your input is never uploaded to DevToolMate servers or external APIs.

Is JSON to YAML converter free?

Yes. JSON to YAML is completely free with no account required. Processing happens locally on your device.

What YAML file format does this tool output?

JSON to YAML outputs a safe YAML subset: block-style objects, arrays, strings, numbers, booleans, and null. Anchors, aliases, and custom tags are not emitted to ensure compatibility with standard YAML parsers and config frameworks.

Related tools

• YAML to JSON: Convert YAML to JSON online free, no upload. Safe parsing in your browser for docker-compose, Kubernetes, OpenAPI specs. No account needed.
• JSON Formatter: Online JSON formatter - beautify and format JSON in your browser with adjustable indentation and key sorting. Free, no upload, no account.