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YAML → JSON

Convert YAML to JSON.

Turn YAML configs into strict JSON for APIs and tooling. Comments stripped, structure and types preserved exactly.

Convert nowOr use the universal converter
Converts in your browserNo signupNever uploadedFree

YAML to JSON, and what changes along the way

YAML is the human-friendly config format; JSON is the strict, universal interchange format that every language and API parses natively. Converting YAML to JSON is exactly what build tools do under the hood when they hand your config to a program.

When you'd want JSON

  • Sending an HTTP request body or API payload
  • Tools and CLIs that only accept JSON
  • Validating against a JSON Schema, or processing with jq
  • Embedding config directly in JavaScript or TypeScript

What changes

Keys, values and nesting are preserved, but a few YAML-only features resolve: comments are dropped (JSON has none), and anchors and aliases (& / *) are expanded to the values they reference.

One gotcha is YAML's implicit typing: bare yes, no, on, off and unquoted numbers become booleans and numbers. If you need them kept as text, quote them in the YAML before converting.

How it works

  1. 01

    Choose your YAML

    Drop a file or pick one from your device. Private by default.

  2. 02

    Convert losslessly

    YAML becomes JSON right in your browser — structure and values preserved, no upload, no paid API.

  3. 03

    Download

    Grab your JSON.

Lossless, structure-preserving conversion

Converts in your browser — never uploaded

No watermark, no signup to try

Handles large files

Free and open-source engine

YAML to JSON

YAML and JSON are structured-data formats. This parses your YAML and re-serialises the same data as valid JSON, entirely in your browser — nothing is uploaded. Key order and whitespace may be normalised; the data itself is preserved.

Converting a lot of these?

Grab a conversion pack for heavy use — or convert them straight from your own code with the FileWhirl API.

See plans

Common questions

Is it free?+

Yes — convert YAML to JSON free. No signup, no watermark, no daily cap.

Is my data private?+

It runs entirely in your browser — your file never leaves your device or touches our servers.

Is the conversion accurate?+

Yes — we use a faithful, lossless engine. Keys, values and nesting are preserved so the output round-trips back to your source.

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