Introducing the YAML to JSON Converter — Parse Config Files in Your Browser

YAML runs modern infrastructure — Kubernetes manifests, GitHub Actions workflows, Docker Compose files, and Ansible playbooks are all written in it. But JSON-only APIs, log pipelines, and debugging tools frequently need that same data in JSON form. The new YAML to JSON converter translates any YAML document to formatted JSON directly in your browser, with no server round-trip and no library dependencies.

What it does

• Hand-rolled YAML parser written from scratch — no third-party parsing libraries. The parser handles a practical YAML 1.x subset that covers the vast majority of real config files.
• Block mappings and nesting: indentation-based structure to any depth, the way Kubernetes and Compose files are written.
• Block sequences: lists of scalars and lists of maps (- key: value), the shape used for servers, jobs, and pipeline steps.
• Flow collections: inline [a, b, c] sequences and { key: value } mappings, mixable with block style.
• Typed scalars: integers, floats, booleans, and null (written as null, ~, or left empty) are coerced to their JSON types automatically; quoted values stay strings.
• Comments ignored: # comments — including inline ones — are stripped, while a # inside a quoted string is preserved.
• Optional key sorting: toggle alphabetical sorting of all keys for easier diffs and comparisons.
• Configurable indent: choose 0 (minified), 2 spaces, or 4 spaces for the output.

Use cases

The converter is especially handy when debugging CI and Kubernetes configs. Pasting a GitHub Actions workflow or a K8s manifest shows you the exact data structure a parser reads — invaluable when an indentation mistake or a mis-typed scalar is breaking a deploy.

Feeding JSON-only APIs is another common job: turn a YAML config into the JSON body an endpoint or SDK expects, in one step. And during config migration — moving from YAML-based settings to a JSON store — the key-sorting option produces output that diffs cleanly against an existing JSON file.

Free, and built to stay that way

Every comparable tool online is free, and so is this one. A one-shot, deterministic conversion has nothing to persist and nothing to gate, so there is no Pro tier here — just paste, convert, copy. The difference is that everything runs locally: your config data, which often contains hostnames and ports, never leaves your machine.

Try it

Open the YAML to JSON converter, paste any YAML — a workflow file, a Compose file, or any config — and see the JSON immediately. To understand how YAML maps to JSON in depth, including scalar typing and the block-versus-flow distinction, read the YAML to JSON guide.