JSON to YAML Converter — Free, Instant, In Your Browser
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Paste JSON and get clean, readable YAML — or flip the direction and turn YAML back into formatted JSON. The converter validates as you type and points at the exact line when something is wrong. Everything runs in your browser: your config files and API payloads are never uploaded anywhere.
How it works
- 1 Paste your JSON or YAML Drop your data into the input panel. Objects, arrays, nested structures, and plain values all work.
- 2 Pick the direction Choose JSON to YAML or YAML to JSON. The swap button flips the direction and carries the previous result over as the new input.
- 3 Copy or download The output updates as you type. Click Copy to grab it, or Download to save a .yaml or .json file.
Your data stays private
All processing happens entirely in your browser. No files, text, or data are ever sent to our servers. You can disconnect from the internet and this tool will still work.
Frequently asked questions
- Why convert JSON to YAML at all?
- YAML is easier for humans to read and edit: no braces, no quote noise, and comments are allowed. It is the standard format for Kubernetes manifests, Docker Compose, GitHub Actions, and most CI/CD configuration, while APIs usually speak JSON — so converting between the two is routine work.
- Does the converter validate my input?
- Yes. Invalid JSON reports the parser error, and invalid YAML reports the line number where parsing failed — for example a tab used for indentation or a missing colon. The output only updates when the input parses cleanly.
- Which YAML features are supported when converting to JSON?
- Block mappings and sequences, nested structures, flow collections like [1, 2] and {a: 1}, quoted and plain scalars, literal (|) and folded (>) block scalars, and comments. Anchors, aliases, custom tags, and multi-document files are not supported and report a clear error instead of guessing.
- Are strings like 'yes' or '42' handled safely?
- Yes. When converting to YAML, strings that could be mistaken for booleans, numbers, or null — like yes, on, 42, or 1.5 — are wrapped in quotes so they stay strings when the YAML is read back. The reverse direction follows YAML 1.2 rules, so yes and no stay plain strings.
- Is my data uploaded anywhere?
- No. The conversion runs entirely in your browser with JavaScript. Your JSON and YAML never leave the page — nothing is sent to a server, logged, or stored.