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Data & Code Utilities

JSON ⇄ YAML Converter

Convert JSON to YAML and YAML to JSON instantly in your browser — ideal for Docker Compose, Kubernetes manifests, and CI/CD pipeline configs.

Runs privately in your browser — your input is never uploaded or tracked.

JSON to YAML Converter (and YAML to JSON) Online

Convert JSON to YAML or YAML to JSON instantly with this free online converter — the quickest way to translate between the two most common configuration formats. Paste a Kubernetes manifest, Docker Compose file, GitHub Actions workflow, or API payload and get a clean, valid conversion in the other format immediately.

The converter preserves nesting, arrays, numbers, booleans, and null values faithfully in both directions, and validates your input first — so a stray tab or missing colon in YAML, or a trailing comma in JSON, is caught with a clear error message instead of producing a silently broken config.

How to Convert Between JSON and YAML

  1. Paste your source

    Drop JSON into the JSON pane or YAML into the YAML pane — the tool detects and validates it.

  2. Convert instantly

    The equivalent document appears in the other format immediately, with correct indentation.

  3. Check for errors

    Invalid syntax is flagged with a specific message so you can fix the source before converting.

  4. Copy the result

    Copy the converted YAML or JSON with one click, ready to paste into your manifest, pipeline, or code.

Features of the JSON ⇄ YAML Converter

  • True two-way conversion

    JSON to YAML and YAML to JSON in the same tool, with structure and data types preserved.

  • Built for DevOps files

    Perfect for Kubernetes manifests, Docker Compose, Helm values, CI/CD pipelines, and OpenAPI specs.

  • Validation before conversion

    Syntax errors in either format are reported with details instead of generating corrupt output.

  • Type-faithful output

    Strings that look like numbers, booleans, and nulls are quoted correctly so YAML round-trips safely.

  • Local and private

    Configs — which often contain hostnames and secrets — never leave your browser.

Frequently Asked Questions

Why convert JSON to YAML?

YAML is easier for humans to read and edit and supports comments, which is why Kubernetes, Docker Compose, and most CI systems use it. Converting JSON output (from APIs or scripts) to YAML makes it usable in those configs.

Is YAML a superset of JSON?

Effectively yes — valid JSON is also valid YAML (in YAML 1.2), which is why conversion between them is lossless for standard data structures.

Does the converter handle nested arrays and objects?

Yes. Arbitrarily deep nesting converts correctly in both directions, with proper YAML indentation and JSON brackets.

Why did my YAML value 'no' turn into false?

Older YAML parsers treat words like no, yes, on, and off as booleans (the 'Norway problem'). This converter quotes ambiguous strings so your data survives the round trip intact.

Can I convert a Kubernetes manifest to JSON?

Yes — paste the YAML manifest and copy the JSON output, which is handy for kubectl's JSON mode, API calls, or programmatic manipulation.