YAML to JSON Converter

The YAML to JSON Converter turns YAML documents — Kubernetes manifests, Docker Compose files, CI/CD pipeline definitions, application configs — into clean, machine-readable JSON. Paste any YAML that resolves to a mapping or sequence, and the parser expands anchors and aliases, resolves standard type tags, and produces indented or compact JSON your code, API, or build tooling can consume immediately.

• •Full YAML parsing via js-yaml: block style, flow style, and mixed nesting all convert the same way
• •Anchor and alias resolution: '&anchor' / '*alias' references are expanded into their full values in the JSON output
• •Automatic type coercion: YAML booleans, null, integers, floats, and ISO dates convert to their native JSON equivalents
• •Real-time format detection: recognizes YAML vs. JSON as you type and suggests the matching direction
• •Configurable output indentation: 2-space or 4-space JSON for readability
• •Runs entirely in your browser: your YAML data is never uploaded to a server

• •Turning a Kubernetes manifest or Helm values file into JSON for the Kubernetes REST API or a JSON Schema validator
• •Converting a Docker Compose file into JSON for programmatic inspection in a Node.js or Python script
• •Feeding a GitHub Actions or GitLab CI YAML pipeline definition into a JSON-based linting or visualization tool
• •Extracting values from an application config.yaml for a frontend that expects JSON
• •Preparing YAML-based infrastructure-as-code templates (Ansible, CloudFormation) for JSON-driven tooling

1. 1.Paste your YAML into the input editor, or upload a .yaml/.yml file
2. 2.Let auto-detect confirm the direction, or select 'YAML to JSON' manually
3. 3.Choose 2-space or 4-space indentation for the JSON output
4. 4.Click Convert to run the conversion
5. 5.Copy the JSON output or download it as a .json file

• •Multi-document YAML streams (files with '---' separators between documents) are not supported — the parser throws an error ('expected a single document in the stream') instead of converting just the first document, so split multi-document files into separate documents before converting
• •Comments ('# ...') are discarded entirely, since JSON has no comment syntax — review important comments before converting
• •Custom or application-specific YAML tags (anything beyond the standard schema) may fail to parse or be misinterpreted
• •Duplicate keys within the same YAML mapping are rejected outright — the parser throws a 'duplicated mapping key' error rather than silently keeping the last value, so fix duplicate keys in the source before converting

• •Anchors and aliases are expanded (duplicated) in the JSON output, not preserved as references, since JSON has no equivalent
• •Very large YAML files (deeply nested Kubernetes CRDs, large Helm charts) may exceed browser memory — use 'yq' or a script-based pipeline for huge documents
• •The tool does not validate YAML against a schema (Kubernetes OpenAPI, JSON Schema) — it only checks that the YAML itself parses

If you're starting from JSON — an API response, a package.json-style config, or exported application settings — and need human-editable YAML for a Kubernetes manifest, CI pipeline, or config file, use the JSON to YAML Converter instead. It outputs clean block-style YAML and automatically quotes scalars that would otherwise be misread as YAML keywords.