YAML ↔ JSON
Use YAML ↔ JSON to convert yaml to json and back — free, immediate, and with nothing to install. Parsing, formatting and validation all run in your browser, so API keys, tokens and internal payloads are never transmitted. It is used most by backend engineers inspecting an API response mid-debug. Reports the line and position of a syntax error instead of failing silently. Nothing is gated: no signup wall, no trial period, no upgrade prompt.
Key features
- Reports the line and position of a syntax error instead of failing silently.
- Handles large payloads — several megabytes of JSON is fine.
- Works on desktop, tablet and phone — no separate app to install.
- Built to do one job properly rather than twenty jobs badly.
How to use YAML ↔ JSON
- Paste your input: Drop the payload, code or value into the box above.
- Run it: Press the action button — errors are reported with their position.
- Take the output: Copy the result, or download it when the output is a file.
Frequently asked questions
- Is it safe to paste production data into YAML ↔ JSON? — Yes. YAML ↔ JSON runs entirely in your browser — no request is made, nothing is logged, and nothing persists after you close the tab.
- What happens with invalid input? — You get the position of the problem rather than a blank failure, so it is usable as a validator.
- How large an input can it take? — Several megabytes is routine. The limit is your browser's memory, not a server quota.
- Does it follow the official spec? — Yes — the published specification, not a simplified version, so results match your language's own parser.