YAML ↔ JSON Converter
Convert YAML to JSON and JSON to YAML instantly in your browser.
Converted JSON will appear here.
About the YAML ↔ JSON Converter
This YAML to JSON converter turns YAML into clean, indented JSON and converts JSON back into readable YAML, both directions on the same page. Pick a direction, paste your document, and the result updates as you type. It is handy when a config file is written in one format but a tool or API expects the other.
YAML and JSON describe the same kinds of data: mappings, sequences, strings, numbers, booleans, and null. YAML is friendlier to read and write by hand because it leans on indentation instead of braces and quotes, which is why so many CI pipelines, Kubernetes manifests, and application settings use it. JSON is stricter and more universal, so it is often what programs read and produce. Converting between them lets you keep the format you prefer for editing while still meeting whatever a given system requires.
The converter parses your input fully, so it catches real problems rather than guessing. If indentation is inconsistent, a key is duplicated, or a JSON value is missing a comma, you get a calm inline message that points at the issue instead of a broken result. Fix the input and the output reappears immediately.
Everything runs in your browser. Your YAML or JSON is parsed and converted locally using JavaScript on this page, and nothing you paste is uploaded, logged, or sent to any server. You can use it on private configuration and secrets without anything leaving your machine.
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Frequently asked questions
How do I convert YAML to JSON?
Choose the "YAML to JSON" direction, paste or type your YAML into the input panel, and the JSON output appears on the right as you type. Use the copy button to grab the result.
Can it convert JSON back into YAML?
Yes. Switch the direction select to "JSON to YAML" and paste valid JSON. The tool produces equivalent YAML with standard indentation that you can copy or paste into a config file.
Why am I seeing an error message?
The input could not be parsed. Common causes are inconsistent indentation or tabs in YAML, a duplicate key, or a trailing comma or missing quote in JSON. The message describes the problem so you can correct that spot and the output returns.
Is my data uploaded or stored anywhere?
No. The conversion happens entirely in your browser with local JavaScript. Nothing you paste is sent to a server, saved, or logged, so it is safe to use with private or sensitive configuration.
Does it support comments and multiple YAML documents?
YAML comments are read during parsing but do not carry over, since JSON has no comment syntax. The converter works on a single document at a time, so split multi document YAML streams and convert each part separately.