YAML to JSON Converter

Convert YAML ↔ JSON bidirectionally with live validation

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100% freeNo signupRuns in your browser

Built by WOWHOW Team · 14+ yrs engineering

YAML to JSON Converter is a free, browser-based tool that lets you convert yaml ↔ json bidirectionally with live validation — with zero signup, zero installation. Your data never leaves your browser. Part of 138+ free developer and business tools at wowhow.cloud, built and maintained by a team with 14+ years of hands-on development experience.

TOOLYAML to JSON Converter

YAML Input

JSON Output

About YAML to JSON Converter

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.

How It Works

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.

Who Is This For

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.

How to Use

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

Frequently Asked Questions

Single-document YAML is fully supported. Multi-document YAML (separated by ---) converts the first document. Use the dedicated YAML array syntax for multiple objects in one file.

Yes. js-yaml resolves anchors (&) and aliases (*) during parsing, so the JSON output contains fully expanded values rather than references.

If your input starts with { or [ it is treated as JSON. Any other text is treated as YAML. You can also override direction manually with the toggle.

No — JSON has no comment syntax, so YAML comments are dropped during conversion. They are preserved if you only reformat YAML without converting.