YAML to JSON Converter — Convert YAML Online Free

YAML to JSON Converter parses any valid YAML input and returns clean, formatted JSON. Paste a Kubernetes manifest, an Ansible playbook, a Helm values file, or any YAML configuration block — the converter processes it on the server and returns pretty-printed JSON with 2-space indentation, unescaped slashes, and full Unicode support. Nothing is stored or logged.

Why convert YAML to JSON

YAML is the dominant format for infrastructure configuration — Kubernetes manifests, Docker Compose files, GitHub Actions workflows, and Ansible playbooks all use it. JSON is the standard for APIs, schema validators, and programmatic tooling. Converting between the two is a daily task for DevOps engineers: verify a Kubernetes ConfigMap against a JSON Schema validator, pass a Helm values file to an API endpoint that only accepts JSON, or debug a nested structure by viewing it as JSON. This tool handles the conversion in one step without installing a library or running a script.

Multi-document YAML

YAML files can contain multiple documents separated by ---. A single Kubernetes manifest file often bundles a Deployment, a Service, and a ConfigMap as three YAML documents in one file. The converter handles multi-document input: each document is parsed and the result is returned as a JSON array, one element per document. Single-document input returns a plain JSON object (not wrapped in an array).

Processing and privacy

Your YAML is sent to the server only for the duration of the conversion request and is discarded immediately after. No data is written to disk, logged, or shared. The conversion uses PHP's native YAML extension (yaml_parse_all()) where available, with Spyc as a pure-PHP fallback — both support the same YAML 1.1 and 1.2 features including anchors, aliases, block and flow styles, and multi-line strings.