About this tool
Convert configuration and API data between YAML and JSON without leaving the browser.
YAML JSON Converter is useful for teams that move between configuration files, API payloads, docs, and specs. Instead of using one tool for each direction, this page supports both YAML to JSON and JSON to YAML so format switching stays fast during implementation and review.
- Uses js-yaml 5.2.1 with explicit YAML 1.2 Core, JSON-compatible, failsafe, and YAML 1.1 legacy schema choices.
- Limits aliases, merged keys, depth, documents, nodes, and bytes and rejects circular aliases, unsafe integers, and non-finite numbers.
- Reparses and compares every JSON or YAML output before copy, reverse conversion, or download is enabled.
How to use YAML JSON Converter
Choose the direction you need, paste the source content, and review the converted output before copying it into the next system. If the YAML source includes comments or formatting conventions, remember that structural conversion focuses on data shape rather than preserving authoring style.
When this tool is useful
- Uses js-yaml 5.2.1 with explicit YAML 1.2 Core, JSON-compatible, failsafe, and YAML 1.1 legacy schema choices.
- Limits aliases, merged keys, depth, documents, nodes, and bytes and rejects circular aliases, unsafe integers, and non-finite numbers.
- Reparses and compares every JSON or YAML output before copy, reverse conversion, or download is enabled.
Examples you can test
Load an example, compare the result with the expected output, then replace it with your own input.
Convert config JSON to YAML
Example input
{"name":"app","debug":false}Expected output
name: app debug: false
Useful when moving API examples or config snippets into human-edited YAML files.
Convert YAML to JSON for an API
Example input
name: app debug: false
Expected output
{"name":"app","debug":false}JSON output is easier to paste into API clients, fixtures, and validation tools.
Validation checklist
- Review indentation when converting YAML because structure depends on spacing.
- Remember that YAML comments are not preserved in plain JSON output.
- Validate the result in the destination parser before shipping config changes.
- Check booleans, numbers, and quoted strings when type preservation matters.
- Keep a copy of the original config when comments or formatting conventions are important.