Free Developer Tool - runs 100% in your browser
JSON ↔ YAML Converter
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Convert between JSON and YAML online
This two-way JSON ↔ YAML converter translates data in either direction with one click. Paste JSON on the left to get clean, indented YAML - or paste YAML on the right to get valid JSON. It's built for the formats you meet every day: Kubernetes manifests, Docker Compose files, GitHub Actions workflows, OpenAPI specs and application config.
JSON vs YAML - when to use which?
JSON is the universal machine format: strict, fast to parse and supported natively by every language. YAML is a superset designed for humans: no braces or quotes required, comments allowed, and indentation expresses structure. Configuration that people edit by hand (CI pipelines, infrastructure-as-code) tends to be YAML; data exchanged between programs tends to be JSON. Since every JSON document is also valid YAML, converting between them is lossless for standard data types.
Supported YAML features
- Nested mappings and block-style lists with any indentation depth.
- Inline flow syntax like
[1, 2, 3]and{a: 1}. - Scalars: strings (quoted and plain), numbers, booleans,
null/~. - Comments (
#) - stripped on conversion, as JSON has no comment syntax.
The converter is written in plain JavaScript and runs entirely offline in your browser - safe for config files containing secrets. For advanced YAML features like anchors, aliases and multi-document streams, use a full parser in your toolchain. Need to tidy the JSON side? Use theJSON formatter.