Converters · Free online tool

YAML ↔ JSON Converter

Convert YAML and JSON in either direction with validation, indentation controls, and local-only processing.

Quick answer: Paste YAML or JSON, choose the conversion direction, and press Convert. The output updates instantly and validation errors are shown before you copy the result.
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How this yaml json converter helps

This bidirectional YAML and JSON converter is built for configuration-heavy workflows such as Kubernetes manifests, Docker Compose files, GitHub Actions, Ansible variables, and API schemas. It converts YAML into strict JSON for programs that require it, and converts JSON back into readable YAML for review or documentation. You can choose the YAML indentation, sort keys when converting JSON, and see syntax errors before using the output. The converter uses a bundled parser rather than a remote API, so secrets, deployment details, and internal configuration remain on your device. A copy button and downloadable output make it easy to move the result into an editor or repository. The page also supports recent local history, mobile layouts, and a sample document for quick testing. It is a practical bridge between human-friendly YAML and machine-friendly JSON, especially when you need a quick conversion without installing command-line tools.

Last updated: . All processing happens locally; no tool input is sent to a server.

Real-world examples

Inspect a Kubernetes manifest

Convert YAML to JSON to compare resources or feed a JSON-only validation pipeline.

Document an API object

Convert strict JSON into indented YAML that is easier to read in documentation.

Check CI configuration

Paste a workflow file and catch indentation or syntax errors before pushing.

Frequently asked questions

Can YAML always be converted to JSON?

Most common mappings, lists, strings, numbers, booleans, and null values convert cleanly. YAML-specific tags or advanced features may not have a direct JSON equivalent.

Does JSON to YAML preserve key order?

JavaScript objects generally preserve insertion order for ordinary keys. The optional key sorter intentionally changes order when enabled.

Is YAML indentation important?

Yes. YAML uses indentation to express structure. Incorrect spaces are one of the most common causes of validation errors.

Does this support multiple YAML documents?

This tool is optimized for one document at a time so the output remains predictable and easy to inspect.