Converter Tools

YAML to JSON Converter

Convert YAML to JSON and JSON to YAML in your browser. Block, flow, anchors, aliases, multi-line scalars, with line and column error reporting.

Convert

YAML and JSON in either direction

Output indent

YAML input supports block mappings, sequences, flow [..] and {..}, literal | and folded > block scalars, anchors and aliases.

YAML input

Conversions run entirely in your browser. Nothing you paste is sent to a server.

JSON output

JSON ready1 document24 keys681 B

{
  "name": "zerosignuptools",
  "version": "1.0.0",
  "tags": [
    "tools",
    "browser",
    "free"
  ],
  "features": {
    "signup_required": false,
    "upload_required": false,
    "max_input_chars": 600000
  },
  "authors": [
    {
      "name": "Ada Lovelace",
      "role": "Engineer"
    },
    {
      "name": "Grace Hopper",
      "role": "Admiral"
    }
  ],
  "build": {
    "description": "Static-first Next.js\napp with no backend.\n",
    "output": ".next"
  },
  "servers": {
    "primary": {
      "region": "us-east-1",
      "port": 443,
      "tls": true
    },
    "fallback": {
      "region": "eu-west-1",
      "port": 443,
      "tls": true
    }
  }
}

How to use

Pick a direction: YAML to JSON or JSON to YAML.
Paste your YAML or JSON into the input area, or click Load sample to see an example with anchors, block scalars, and flow collections.
Pick an output indent (2 spaces, 4 spaces, or minified for JSON output).
Read the document, key, and byte stats above the output and click Copy to copy the result. Use Swap direction to feed the output back in.

About this tool

YAML to JSON Converter parses YAML 1.2 in your browser and gives you the equivalent JSON, ready to paste into a config file, an HTTP request body, a CI pipeline, or a tool that only speaks JSON. Paste a YAML document and the converter handles block-style mappings (key: value) and sequences (- item), nested structures with significant indentation, flow-style mappings ({a: 1, b: 2}) and sequences ([1, 2, 3]) that span multiple lines, plain scalars typed by the YAML 1.2 core schema (null, true/false, integers, floats, strings), single-quoted and double-quoted strings with full escape sequences (\n, \t, \xNN, \uNNNN, \UNNNNNNNN), block scalars in literal (|) and folded (>) styles with strip and keep chomping indicators (|-, |+, >-, >+), comments, document separators (---), anchors (&name), and aliases (*name) that share structure. Errors include the exact line and column number so you can find malformed input quickly. The reverse direction takes any valid JSON and emits clean YAML with sensible quoting: keys that need quoting (reserved words like null, yes, on, off, strings that look like numbers) are quoted automatically, multi-line strings are emitted as escaped double-quoted scalars to preserve content, and indentation matches the size you pick (2 or 4 spaces). Useful for Kubernetes manifests, GitHub Actions workflows, GitLab CI pipelines, Docker Compose files, Ansible playbooks, OpenAPI and AsyncAPI specs, Helm charts, CircleCI config, Cloud Build, Serverless Framework, and any place a developer needs to switch between YAML and JSON without copy-paste-edit. Conversions run entirely in your browser, so the configs and secrets you paste never leave your device.

Free to use. Works in your browser. No signup, no login.

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