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YAML to JSON Converter

Paste YAML and get validated, structured JSON output.

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Convert tool
YAML to JSON Converter
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YAML Input
JSON Output

A YAML to JSON converter is essential for anyone working at the intersection of cloud-native tooling (YAML-heavy) and application code (JSON-native). Whether you're feeding a Kubernetes manifest into a custom controller, transforming a GitHub Actions workflow for analysis, or converting an OpenAPI spec for a code generator, getting from YAML to JSON cleanly — with full validation of the source YAML — saves hours of debugging.

How YAML to JSON Conversion Works

The parser implements a subset of the YAML 1.2 spec: key-value pairs, nested mappings (objects), sequences (arrays), block and flow styles, scalar types (string, int, float, bool, null), and proper handling of quoted vs. unquoted values. The resulting JavaScript object is then serialized to JSON with 2-space indentation. If the YAML is malformed (bad indentation, unclosed quotes, tab characters), you get a parse error with the line and column number of the problem.

When to Convert YAML to JSON

  • Kubernetes tooling — kubectl, custom controllers, and admission webhooks all speak JSON internally.
  • CI/CD analysis — lint GitHub Actions, GitLab CI, CircleCI configs by converting and validating against a JSON Schema.
  • OpenAPI codegen — most code generators accept either, but JSON is often the more reliable input.
  • Migrating off YAML — if YAML's whitespace-sensitivity has bitten you one too many times, convert your configs to JSON.
  • Diffing — JSON diffs are more predictable than YAML diffs because there's no ambiguity about ordering, indentation, or string quoting.

YAML to JSON in Code

// Node.js with js-yaml
const yaml = require('js-yaml');
const obj = yaml.load(yamlString);
const jsonStr = JSON.stringify(obj, null, 2);

// CLI: yq
// yq -o=json '.' input.yaml

// CLI: Python + PyYAML
// python -c "import yaml,json,sys; print(json.dumps(yaml.safe_load(sys.stdin), indent=2))" < input.yaml

YAML Spec Compatibility

This converter implements YAML 1.2-compatible parsing for the features most commonly used in cloud-native configs: simple mappings, sequences, and scalars. Advanced YAML features like anchors (&name), aliases (*name), tags (!!str), and merge keys (<<) are not supported — if your YAML uses them, expand them first with yq or kustomize. Once converted, you can re-format with our JSON formatter or minify with the JSON minifier.