snaptools
J
JSON Formatter
INDENT
// about this tool

JSON Formatter Online

Updated 2026-07-09

Format and beautify messy or minified JSON instantly, right in your browser. Paste raw JSON into the editor and SnapTools returns clean, properly indented, human-readable output as you type — with configurable spacing, optional key sorting, and one-click copy or download. Nothing is uploaded: all formatting happens locally, so it's safe for API keys, tokens, and private data.

A well-formatted JSON document is far easier to scan, debug, and review than a single minified line. Whether you're inspecting an API response, tidying a configuration file, or preparing a payload for documentation, the JSON Formatter gives you readable structure in one step.

// how to use

  1. 1 Paste or type your JSON into the input panel on the left — formatting starts as you type.
  2. 2 Open Settings to choose indentation (2, 4, or 8 spaces), sort keys, or compact arrays.
  3. 3 Read the clean, indented result on the right, then click Copy or Download.

// examples

Minified to readable
Input
{"name":"Ada","roles":["admin","dev"],"active":true}
Output
{
  "name": "Ada",
  "roles": [
    "admin",
    "dev"
  ],
  "active": true
}
Nested objects
Input
{"user":{"id":1,"prefs":{"theme":"dark","beta":false}}}
Output
{
  "user": {
    "id": 1,
    "prefs": {
      "theme": "dark",
      "beta": false
    }
  }
}

// common uses

Debugging API responses Cleaning up exported config files Making log payloads readable Preparing JSON for code review or documentation

// faq

No. Formatting runs entirely in your browser, so your data never leaves your machine — safe for secrets, tokens, and private payloads.
The formatter handles inputs up to about 5 MB instantly. Larger files still work but may take a moment to render.
The status bar shows the first syntax error — usually a missing comma, quote, or bracket. Fix that spot and the output updates as you type. For line-by-line errors, try the JSON Validator.
Yes. Open Settings and enable "Sort keys A→Z" to get deterministic, diff-friendly output.
Formatting adds indentation and line breaks to make JSON readable; minifying removes all whitespace to make it as small as possible. Use the JSON Minifier for the latter.

// related

JSON Validator JSON Minifier JSON to YAML JSON to CSV JSON Sort Keys

Use this via API

Get a free API key → 
curl -X POST https://snaptools.dev/api/v1/tools/json-formatter \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"json":"{\"name\":\"Ada\",\"roles\":[\"admin\",\"dev\"],\"active\":true}"}'
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