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YAML to JSON Converter

Paste any YAML file or block and get a clean, formatted JSON object in return. The parser handles nested maps, lists, quoted strings, numbers and booleans, and preserves your structure so it is ready to paste into code, tools or APIs.

100% Client-Side — Your Data Never Leaves Your Browser

What is YAML to JSON Converter?

Turn YAML configs into formatted JSON in one click. Paste any YAML file or block and get a clean, formatted JSON object in return. The parser handles nested maps, lists, quoted strings, numbers and booleans, and preserves your structure so it is ready to paste into code, tools or APIs. The tool runs 100% in your browser — nothing is uploaded to a server, so your data stays private, and it is free to use with no signup required.

Quick Answers

What YAML does this converter support?
It handles the common subset: nested block maps, block sequences, inline scalar values, quoted strings, numbers, booleans and null. Anchors, aliases and multi-line literal blocks are not expanded.
Is YAML to JSON conversion lossless?
For standard maps and lists yes. As with any YAML parser, anchors/aliases are resolved as their dereferenced value and comments are discarded.
Can I convert JSON back to YAML here too?
Yes. Use the companion JSON to YAML converter on this site to go the other direction.
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How do I use YAML to JSON Converter?

  1. Paste your YAML into the input box.
  2. The JSON object is generated instantly as you type.
  3. Copy the JSON or download it as a .json file.

Why use our yaml to json converter?

This YAML to JSON converter is the perfect companion for developers who receive YAML configs but need JSON for their tooling. It parses block maps and block sequences, inline arrays, quoted and plain scalars, numbers, booleans and null, and pretty-prints the result with two-space indentation. All parsing runs client-side so your config stays private.

YAML vs JSON — what changes during conversion

Converting YAML back to JSON restores the strict, brace-delimited form that APIs and most programming languages expect. These are the structural changes the converter applies.

AspectYAML sourceJSON output
IndentationIndentation defines nesting and can be any consistent widthBraces {} and commas define nesting; whitespace ignored
Unquoted stringsCommon and often required in block styleEvery string must be double-quoted
Aliases & anchorsSupported (e.g. &anchor and *reference)Not part of JSON — must be expanded
Multi-line stringsBlock scalars with | or >Escaped sequences in a single string
Best forHand-edited config filesMachine interchange and API bodies

When a YAML config has to become a JSON API payload

Teams often author config or k8s manifests in YAML (it is compact and comment-friendly) but their REST API only accepts JSON. This example shows a docker-compose-style YAML turned into the JSON body this page produces.

Input YAML

version: "3"
services:
  app:
    image: node:20
    ports:
      - "3000:3000"
  db:
    image: postgres:16

Converted JSON

{
  "version": "3",
  "services": {
    "app": { "image": "node:20", "ports": ["3000:3000"] },
    "db": { "image": "postgres:16" }
  }
}

Paste a Kubernetes Helm value file or a Compose snippet and get a JSON object you can send to an API or store in a JSON document database.

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