JSON YAML Converter
Convert JSON and YAML both ways in your browser.
JSON YAML Converter translates between JSON and YAML in either direction with a single click. Convert config snippets, API payloads, or Kubernetes-style YAML locally, swap directions when needed, and copy or download the output without uploading your data.
How it works
Choose JSON to YAML or YAML to JSON, paste your input, and convert. JSON parsing uses the browser engine; YAML parsing and dumping load the js-yaml library on demand so the main bundle stays lean. Invalid input surfaces the first conversion error clearly.
Benefits
- Bidirectional conversion with a swap action
- Lazy-loaded YAML library for smaller initial load
- Formatted JSON output and readable YAML indentation
- Copy, download, examples, and on-device history
Use cases
- Turn JSON API responses into YAML for config repos
- Convert docker-compose or K8s YAML to JSON for scripts
- Migrate settings between JSON and YAML based tools
- Preview how nested JSON maps to YAML structure
Best practices
- Pick the correct direction before converting
- Use Swap after converting to edit the result in reverse
- Validate JSON separately when the source is untrusted
- Review YAML anchors and tags manually after conversion
Common mistakes
- Pasting JSON while YAML to JSON mode is selected
- Expecting comments in JSON after YAML to JSON conversion
- Assuming key order is preserved identically in both formats
- Converting YAML with custom tags without checking output types
Privacy
Conversion runs in your browser. The YAML library loads from your app bundle when you convert—nothing is sent to ToolHub servers. Optional history stores recent inputs on this device only if enabled.
Frequently asked questions
- Does this tool upload my JSON or YAML?
- No. Conversion runs entirely in your browser. Your input is not sent to ToolHub servers.
- When is the YAML library loaded?
- The js-yaml library loads dynamically when you convert, keeping the initial page bundle smaller until you need YAML support.
- What does Swap do?
- Swap toggles between JSON to YAML and YAML to JSON. If you already have output, it moves that output into the input field for reverse conversion.
- Will comments survive JSON to YAML conversion?
- Standard JSON has no comments. If your source is JSON, the YAML output will not include comments unless they existed as string values.
- Are YAML anchors and tags supported?
- Common YAML maps and sequences convert cleanly. Advanced YAML features like custom tags may need manual review after conversion.
- Can I convert invalid input?
- No. Invalid JSON or YAML stops conversion with an error message. Fix the reported issue and convert again.
- Which direction should I pick first?
- Choose JSON to YAML when you paste JSON, or YAML to JSON when you paste YAML. Use the direction selector before clicking Convert.
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