JSON to YAML Converter

Convert JSON to clean YAML — for Kubernetes manifests, CI pipelines, docker-compose and config files. Powered by the audited js-yaml library, entirely in your browser.

JSON in, config-grade YAML out

The configuration world — Kubernetes manifests, GitHub Actions, docker-compose, Ansible, OpenAPI — runs on YAML, and the data you have is usually JSON. Every JSON document is representable in YAML, so this conversion is lossless: same values, same structure, friendlier syntax. Conversion uses the audited js-yaml library (MIT), bundled locally so your data never leaves the browser.

Worked example

{ "service": "article-api", "replicas": 3,
  "env": { "NODE_ENV": "production", "DEBUG": false } }

becomes:

service: article-api
replicas: 3
env:
  NODE_ENV: production
  DEBUG: false

When to use it

• Turning an API export or JSON config into a manifest or pipeline file.
• Converting OpenAPI documents between their two accepted formats.
• Making a dense JSON structure readable for a review, then adding YAML comments by hand.

Limitations to know

• Output is deliberately plain YAML — no anchors or aliases are generated (they confuse more than they help in generated files).
• Strings that would be misread as other types (“true”, “2023-01-01”, values with colons) are quoted automatically — that selective quoting is correctness, not inconsistency.
• JSON comments do not exist, so none can be carried over.

Common errors and fixes

• Input rejected — the JSON must parse first; the error names line and column.
• Round-trip check — paste the output into the YAML to JSON Converter and compare with JSON Compare; it should be identical.

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