YAML to JSON Converter
Convert YAML to clean JSON — runs entirely in your browser
Paste into the left panel, upload a file, or click Sample to try it out · use Swap to reverse the conversion
Paste any valid YAML document and get clean JSON back instantly. Works with multi-document YAML, anchors, and all standard YAML types. Like all our dev tools, conversion runs entirely in your browser — nothing is transmitted to any server.
How to Convert YAML to JSON
Paste your YAML and get JSON in seconds — browser-only, no data sent anywhere.
Paste or upload your YAML
Type or paste a YAML document into the input, or upload a .yaml or .yml file. Syntax errors are highlighted so you can fix them before converting.
Instant JSON output
Valid YAML is converted to formatted JSON in real time. Toggle between pretty-printed and minified output with one click.
Copy or download
Click Copy or Download as .json. Use the output directly in APIs, config files, or any tool that requires JSON input.
Features
Runs entirely in your browser — your YAML never leaves your device
Live conversion updates as you type — no submit button needed
Handles mappings, sequences, scalars, quoted strings, and nested structures
Correctly parses YAML booleans (true/false, yes/no, on/off) and null values
Handles integer, float, and hex numeric literals
Upload a .yaml or .yml file directly for conversion
Download the result as a .json file instantly
Swap button converts JSON back to YAML in the same tool
Free, no sign-up, no file size limits
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Frequently Asked Questions
Does my YAML get uploaded to a server?
No. All parsing happens in your browser. Your YAML never leaves your device.
What YAML features are supported?
Block mappings (key: value), block sequences (- item), scalars (strings, integers, floats, booleans, null), and nested structures of arbitrary depth.
Why does YAML have so many ways to write booleans?
YAML 1.1 treated yes, no, on, off, true, and false as booleans. This converter follows that convention. If you need the literal string yes in your JSON, quote it in the YAML: 'yes'.
Can I convert JSON back to YAML in the same tool?
Yes. Click the Swap button — the tool handles both YAML to JSON and JSON to YAML.
My YAML has a parse error — what does that mean?
YAML is whitespace-sensitive. Common causes: mixing tabs and spaces, inconsistent indentation levels, or unquoted special characters like colons in values.
Is there a file size limit?
No hard limit. Large YAML config files parse in milliseconds on any modern browser.