YAML to JSON Converter

Convert both directions, and catch indentation errors.

YAML to JSON converts YAML into JSON and JSON back into YAML, reporting the exact line of any indentation or syntax error. It supports mappings, sequences, multi-line block scalars, anchors and aliases, and the quoting rules that make YAML deceptively tricky. Conversion happens in your browser, so config files stay private.

This tool needs JavaScript, because the work happens on your device rather than on a server. Everything below — how it works, the FAQ and the related tools — is readable without it.

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Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.

How to use YAML to JSON Converter

Paste YAML or JSON.
Convert in either direction.
Fix any reported errors and copy the result.

Questions about YAML to JSON Converter

Why does my YAML fail to parse?

Almost always indentation — tabs are illegal as indentation in YAML, and mixed indent widths break block structure. After that comes unquoted strings that look like other types: no parses as false, 1.0 as a number, and a version like 1.10 becomes 1.1.

Are anchors and aliases supported?

Yes, and they are expanded when converting to JSON, since JSON has no way to express a reference. Circular references are detected and reported rather than looping forever.

Which YAML version?

YAML 1.2, which is a strict superset of JSON — so valid JSON is valid YAML input. The notable 1.1 behaviours that changed, like yes/no as booleans, are handled the 1.2 way with a warning where it is ambiguous.

Does it check my file against a schema?

No. It checks that the YAML parses and converts, which catches indentation, tab and quoting mistakes. Whether the result is a valid Kubernetes manifest or CI config is a separate question that needs that tool's schema.

Are comments preserved?

Not when converting to JSON — JSON has no comment syntax, so they are dropped. Converting JSON back to YAML gives a clean document with no comments, so keep the original if the comments matter to you.

Is YAML to JSON Converter really free, with no limits?

Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.

Are my files or text uploaded when I use YAML to JSON Converter?

No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.