YAML to JSON Converter
Convert YAML to JSON and JSON to YAML with full syntax validation and clear error messages. Free, instant, runs on your device.
Runs 100% on your device - nothing you enter or upload leaves your browser.
How to convert YAML and JSON
Choose the direction, paste your data and press Convert. Syntax errors are reported with the exact line.
Common uses
- Checking Kubernetes, Docker Compose or CI configuration before applying it.
- Turning YAML configs into JSON for APIs and scripts.
- Converting JSON API responses into readable YAML for documentation.
Frequently asked questions
Which YAML features are supported?
Nested maps and lists, multiline strings, comments, anchors and standard scalar types, parsed by the widely used open-source js-yaml library (YAML 1.2).
Why does my YAML fail to convert?
The most common cause is indentation with tabs - YAML requires spaces. The error message names the line where parsing failed.
Is my data uploaded?
No. Conversion runs entirely in your browser.
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