YAML is the standard format for Kubernetes manifests, GitHub Actions workflows, Docker Compose files, and most CI/CD configuration. JSON is the universal data interchange format for APIs and tooling. Converting between them is a constant need during DevOps work, configuration debugging, and API testing. This tool uses js-yaml — the same library powering most Node.js YAML tooling — for accurate spec-compliant conversion.
YAML parsing uses js-yaml in DEFAULT_SCHEMA mode, which supports all standard YAML 1.2 types including timestamps, null, booleans, integers, and floats. The parsed JavaScript object is then serialised to JSON with a 2-space indent via JSON.stringify.
JSON-to-YAML takes the parsed JSON object and passes it through js-yaml.dump() with a line width of 120, block style for objects and arrays, and no flow-style — producing clean, readable YAML. Syntax errors are caught and displayed with the parser's line/column position.
A DevOps engineer converts a JSON export from a configuration portal into YAML before committing it to a Kubernetes ConfigMap.
A developer converting a GitHub Actions workflow received as JSON back to YAML for version control.
A backend engineer quickly validates that a YAML config file parses to the expected JSON structure before deploying to production.
Paste YAML into the left panel — JSON appears on the right instantly
Or paste JSON into the right panel — YAML appears on the left
Check the error bar for syntax problems with exact line numbers
Copy the output or download as .yaml or .json file
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