YAML ↔ JSON Converter Online
Convert YAML to JSON and JSON to YAML instantly — no server, no signup
Output will appear here
About this tool
YAML to JSON Converter Online is a free, browser-based tool for converting YAML to JSON and JSON to YAML instantly. Whether you are working with Kubernetes configs, Docker Compose files, GitHub Actions workflows, LangChain agents, or any other YAML-based configuration, this tool converts between formats with full fidelity — preserving types, nested structures, arrays, and booleans.
Paste your YAML or JSON directly, drag and drop a file, or upload a .yaml, .yml, or .json file. Output is syntax-highlighted for easy reading and can be copied or downloaded in one click. All conversion runs entirely in your browser using the js-yaml library — your data is never sent to any server.
Common use cases
- Convert Kubernetes YAML manifests to JSON for use with kubectl or API clients.
- Transform Docker Compose files to JSON for programmatic processing.
- Convert GitHub Actions workflow YAML to JSON for inspection or editing.
- Transform LangChain, CrewAI, or Hugging Face config files between formats.
- Convert JSON API responses to YAML for cleaner human-readable config files.
- Prepare YAML configs for tools that only accept JSON input.
- Convert OpenAPI YAML specs to JSON for use with code generators.
- Quickly inspect deeply nested YAML structures in JSON format.
- Convert Ansible playbooks or Helm chart values to JSON.
- Transform CI/CD pipeline configs between YAML and JSON formats.
Frequently Asked Questions
Does this tool preserve types like booleans and numbers?
Yes. The converter uses js-yaml which correctly parses YAML types. Booleans (true/false), integers, floats, and null values are preserved as their proper JSON types — not converted to strings.
Can I convert multi-document YAML files?
The tool handles single YAML documents. Multi-document YAML (separated by ---) will only parse the first document. Split your documents before converting.
Does it support YAML anchors and aliases?
Yes. js-yaml resolves YAML anchors (&) and aliases (*) during parsing, so the output JSON will contain the fully resolved values.
Can I upload a .yml or .yaml file?
Yes. Click the Upload button or drag and drop a .yaml, .yml, or .json file. The file is read locally — nothing is uploaded to a server.
Are YAML comments preserved in the output?
No. JSON does not support comments, so YAML comments are lost when converting to JSON. When converting JSON to YAML, no comments are added.
Is my data sent to a server?
No. All conversion happens in your browser using js-yaml. Your data never leaves your device.
What YAML version does this support?
js-yaml supports YAML 1.2, which covers the vast majority of real-world YAML files including Kubernetes, Docker, GitHub Actions, and other DevOps tooling.
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