Convert YAML to JSON in Seconds

YAML is the format of choice for hand-maintained config — Kubernetes manifests, Docker Compose files, CI pipeline definitions, Helm chart values — but scripts, JSON Schema validators, and most programming languages' built-in parsers expect JSON, not YAML. Converting a config file to JSON is usually the fastest way to feed it into a script or validation tool that has no YAML support of its own.

This comes up constantly for developers working with infrastructure-as-code: a values.yaml file from a Helm chart needs to be validated against a JSON Schema, or a docker-compose.yml needs its settings read into a Node.js script for a deployment tool — both of which are far easier once the file is JSON. Because this converter uses a real YAML library rather than a naive line-by-line parser, indentation, quoting, and YAML's various shorthand notations are all handled the way a YAML-aware tool actually expects.

Because the parsing happens entirely inside your browser tab using a local library, a YAML config file that might contain deployment settings, environment variables, or infrastructure details is never uploaded anywhere during the conversion — it's read, converted, and downloaded without a single network request involved.

Most hand-written YAML converts to JSON without losing anything meaningful, because per the YAML 1.2 specification (read the YAML 1.2 spec), YAML's mappings, sequences, and scalars map directly onto JSON's objects, arrays, and primitive values. Where the two formats genuinely diverge is in the YAML-only features that have no JSON equivalent at all: comments starting with # are simply discarded, since per RFC 8259, the JSON specification (read RFC 8259), JSON has no comment syntax whatsoever, so there's nowhere for that text to go in the output.

Anchors and aliases — YAML's way of reusing a block of data by reference with &name and *name — resolve during parsing into plain duplicated data in the JSON output rather than staying linked; if the anchored block changes, the JSON copies don't update together the way the original references implied they should. YAML timestamps are converted into JavaScript Date objects during parsing and then rendered as ISO 8601 strings in the JSON, which is usually exactly what's wanted but is worth knowing if a date field's exact original formatting mattered. Multi-document YAML files — ones containing more than one document separated by "---" — aren't supported at all; this converter expects a single document per file and shows a clear error rather than silently converting only the first one.