YAML to JSON

Safe parsing

YAML loads with JSON_SCHEMA only. Arbitrary types and code execution are not enabled.

Developer Quick Tips

• Paste YAML from docker-compose.yml, Kubernetes, GitLab CI, or OpenAPI specs; safe JSON_SCHEMA parsing disables code execution and custom tags.
• Upload .yaml or .yml files; output is pretty-printed JSON with 2-space indentation for review and piping into json-validator or other tools.
• JSON-compatible subset: objects, arrays, strings, numbers, booleans, null. YAML anchors, aliases, and comments are not preserved.
• Download converted JSON as data.json for offline use or integrate with downstream tooling and DevToolMate processors.
• All processing runs in your browser. No server upload, no account, input clears when tab closes. Privacy-first for configs and APIs.

Frequently asked questions

Can I convert YAML to JSON online for free?

Yes. YAML to JSON is free, runs entirely in your browser, and requires no account. Paste or upload .yaml/.yml files and download the JSON output instantly.

Is YAML to JSON safe? Does it execute code?

Yes, it is safe. YAML is parsed with JSON_SCHEMA in your browser, which disables arbitrary object types, custom tags (!java, !include), and code execution. Only JSON-compatible types (objects, arrays, strings, numbers, booleans, null) are supported.

What is the difference between YAML and JSON?

YAML is human-readable with indentation-based syntax; JSON is compact and strict. Both support objects, arrays, strings, numbers, booleans, and null. YAML allows comments and anchors; JSON does not. This tool converts YAML to JSON-compatible format, dropping YAML-only features.

Can I convert OpenAPI YAML to JSON?

Yes. Paste OpenAPI specs in YAML format and the tool converts them to JSON using the JSON-compatible YAML schema. Note: YAML anchors, aliases, and comments are not preserved in the JSON output.

Can I convert Docker Compose or Kubernetes YAML to JSON?

Yes. Paste docker-compose.yml, Kubernetes manifests, Helm values.yaml, or other yml files; the tool converts them to JSON using the JSON-compatible YAML schema. YAML anchors, aliases, and comments are not preserved in the JSON output.

Does YAML to JSON upload my data to servers?

No. YAML to JSON runs locally in your browser. Your input is never uploaded to DevToolMate servers or any external service. Processing stays on your device for the current session.

What YAML features are not supported?

YAML anchors, aliases, custom tags, and comments are not supported. The tool uses JSON_SCHEMA for safe parsing, which limits output to JSON-compatible types. For full YAML 1.2 support, use language-specific libraries like PyYAML or js-yaml.

Related tools

• JSON to YAML: Convert JSON to YAML online free, no upload. Browser-local converter for Docker Compose, Kubernetes, Helm, Swagger, and GitLab CI configs.
• JSON Validator: Free JSON validator and linter online. Validate JSON syntax in your browser with line-level error messages. No upload, no account, runs locally.