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YAML to JSON Converter

Convert YAML to JSON format instantly online. Free YAML to JSON converter. Supports multi-document YAML, anchors, and complex configurations.

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YAML's flexible syntax — multiple scalar styles, anchors and aliases, complex type tags — requires a full parser to consume correctly. Converting YAML to JSON produces a strict, unambiguous representation that every programming language can parse with its standard library. JSON's lack of comments and reduced feature set is a feature for machine-to-machine exchange.

YAML-to-JSON conversion is needed when YAML configuration files must be consumed by tools that only speak JSON: AWS CloudFormation (which accepts JSON templates), JSON Schema validators, jq for querying, MongoDB queries, and APIs that expect JSON request bodies. It is also the first step in programmatic processing of Kubernetes manifests and CI pipeline configs.

This tool converts YAML to JSON using the js-yaml library's load() function (which safely parses YAML 1.2 without executing arbitrary code) and then serializes the result with JSON.stringify() with 2-space indentation. Anchors and aliases are resolved, YAML-specific types are normalized, and the output is valid JSON ready for any standard parser.

Common Use Cases

Querying Kubernetes manifests with jq

jq is the standard Unix tool for filtering and transforming JSON on the command line, but it does not parse YAML. When extracting specific fields from Kubernetes manifests — container image tags, resource limits, label selectors — developers convert the YAML manifest to JSON first, then pipe the result through jq expressions.

Validating configs against JSON Schema

JSON Schema validators (Ajv, jsonschema, Spectral) accept only JSON or JavaScript objects as input. When a project uses YAML for its configuration files — OpenAPI specs in YAML, custom config schemas — converting to JSON is necessary before running schema validation in CI pipelines to catch structural errors before deployment.

Uploading CloudFormation templates as JSON

AWS CloudFormation accepts infrastructure templates in both YAML and JSON, but some tooling in the AWS ecosystem — SAR (Serverless Application Repository), certain CDK transforms, third-party drift detection tools — works better with or exclusively accepts JSON templates. Converting a YAML template to JSON ensures compatibility across the full toolchain.

Processing Helm values in scripts

Bash and Python scripts that parse Helm chart values.yaml files often use JSON as an intermediate format: helm get values --output json produces JSON from a live release, but stored values files are YAML. Converting values files to JSON makes them processable by Python's json module or Node.js JSON.parse() without adding a YAML dependency.

How to Use the YAML to JSON Converter

  1. Paste or type your YAML in the left panel.
  2. JSON output appears automatically as you type.
  3. Click "Copy Output" to copy the JSON to your clipboard.
  4. Use "Load Example" to see a sample YAML document.
  5. Click "Clear" to reset both panels.

Supported YAML Features