JSON to YAML / YAML to JSON Converter
Convert between JSON and YAML in either direction, with instant conversion and a one-click swap.
Convert data between JSON and YAML in whichever direction you need. Paste JSON to get tidy YAML, or paste YAML to get valid JSON — and use the swap button to flip the panes without retyping. It's the everyday task of moving config between the compact, brace-heavy format that machines love and the indentation-based one that's easier to read and hand-edit. Everything runs in your browser.
JSON and YAML are the same data, dressed differently
Both formats describe the same underlying structures — objects (mappings), arrays (sequences), strings, numbers, booleans and null. JSON uses braces, brackets and quotes; YAML uses indentation and dashes, which makes it far friendlier for configuration files you edit by hand. Because they map onto the same data model, converting between them is lossless for ordinary structures: a JSON object becomes a YAML mapping, a JSON array becomes a YAML list, and so on.
Convert as you type, swap, and copy
With auto-convert on, the output pane updates as you edit, so you see the result immediately. If your input is malformed — a missing quote in JSON, or inconsistent indentation in YAML — the tool shows a clear error instead of guessing. The swap button moves the output back into the input so you can round-trip or continue converting the other way, and the size and status indicators give you a quick read on what happened.
What to watch for
The converter handles the structures you'll meet in typical config and API data. YAML is a large specification, though, so exotic features — custom tags, anchors and aliases, or multi-document streams — may not round-trip the way niche edge cases do in a full YAML engine. For standard mappings, lists and scalar values it's dependable; if you're relying on an unusual YAML feature, check the output before committing it.
Frequently Asked Questions
Does it convert in both directions?
Yes. Paste JSON to produce YAML, or paste YAML to produce JSON. The swap button flips the panes so you can round-trip without retyping.
What happens if my input has a syntax error?
The tool shows a clear error message rather than producing broken output. Fix the reported issue — a stray comma in JSON or misaligned indentation in YAML — and it will convert.
Will unusual YAML features like anchors survive the round trip?
It reliably handles ordinary mappings, lists and scalars. Advanced YAML features such as anchors, aliases, custom tags or multi-document streams may not convert like they would in a full YAML engine, so verify those cases.
Is my data uploaded to a server?
No. Conversion runs entirely in your browser, so the data you paste never leaves your device.