Inspect configuration
See the exact object and array structure produced by a YAML configuration file.
100% local · files never leave your browser
Convert tool
YAML to JSON Converter
Convert YAML to consistently formatted JSON in your browser. Review configuration data without uploading it.
✓ Free to use✓ No signup✓ Runs locally
80 bytes · local only
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Processed entirely in this tab
Your input and result are not sent to JSON Hearth or stored on a server.
When to use it
What YAML to JSON helps you do
Converting YAML to JSON can make implicit structure and parsed values easier to inspect, validate and consume from code.
Prepare API payloads
Translate YAML examples into JSON for tools and endpoints that accept JSON only.
Debug parsing surprises
Review how strings, numbers, booleans and null values were interpreted by the YAML parser.
How it works
YAML to JSON, without the upload.
Add your data
Paste a value, open a local file or begin with the working sample.
Run the tool
The transformation executes in your browser, not on our servers.
Review the result
Check the output, then copy or download it for your next task.
Important limitations
What to check before using the result
Review required
YAML comments, anchors and presentation details may not survive conversion to JSON.
Review required
YAML can express values that require simplification before they fit the JSON data model.
Common questions
About YAML to JSON
Does YAML to JSON Converter upload my data?
No. Your input is processed by code running in your browser and is not sent to an application server.
Is YAML to JSON free to use?
Yes. The tool is free, requires no account and can be used directly in the browser.
Why do YAML comments disappear in JSON?
Comments are presentation metadata and are not part of the parsed JSON data model.
Can YAML anchors be represented in JSON?
JSON has no anchor or alias syntax. A conversion normally resolves them into ordinary values.