JSON Formatter

JSON Formatter tool

{
  "user": {
    "id": 1,
    "name": "Alice Johnson",
    "email": "[email protected]",
    "roles": [
      "admin",
      "editor"
    ],
    "active": true
  }
}

🔒 Runs in your browser · No uploads · Your data never leaves your device

How to use

1. 1

   Paste or type JSON

   Enter your JSON in the text area. It can be minified, unformatted, or pasted from an API response.

2. 2

   Format or validate

   Click Format to pretty-print with 2-space indentation. Click Validate to check syntax without changing the output.

3. 3

   Copy or clear

   Use Copy to copy the formatted result. Use Clear to reset both input and output.

Common use cases

• Debugging API responses — Paste raw JSON from Postman, curl, or browser DevTools to instantly see a readable, indented structure.
• Code review preparation — Format minified JSON before committing to version control so diffs are readable.
• Config file editing — Clean up JSON config files (tsconfig, package.json, AWS policies) before editing.
• Learning JSON structure — Visualize nested objects and arrays to understand unfamiliar API response shapes.

Examples

• Minified JSON

  Paste minified JSON to get readable output.

  Input

  {"name":"ToolDock","tools":["json","uuid","base64"]}

  Output

  {
    "name": "ToolDock",
    "tools": ["json", "uuid", "base64"]
  }

Frequently asked questions

Does the formatter send my JSON to a server?

No. Formatting and validation run entirely in your browser. Your data never leaves your device.

What indentation does the formatter use?

The formatter uses 2 spaces for indentation. This is a common standard for JSON in configs and APIs.

Key concepts

JSON

JavaScript Object Notation — a lightweight text format for storing and exchanging data.

Pretty printing

Formatting JSON with indentation and line breaks to make it human-readable.

Minified JSON

JSON with all whitespace removed to reduce file size.

JSON validation

Checking that JSON syntax is correct and structurally valid.

Related tools

You might find these useful too.

• Base64 Encode / Decode

  Encode and decode Base64 text privately in the browser.

  Open
• JWT Decoder

  Decode JWT header and payload claims locally in the browser.

  Open
• JSON Diff

  Compare two JSON objects and see added, removed, and changed keys.

  Open
• SQL Formatter

  Format SQL queries with readable indentation instantly.

  Open

More json tools

• JSON Validator

  Validate JSON syntax and see exact error messages instantly.

  Open
• JSON Schema Generator

  Generate JSON Schema from any JSON object instantly.

  Open
• JSON to TypeScript Types

  Generate TypeScript interfaces and types from JSON instantly.

  Open
• JSON to YAML Converter

  Convert JSON to YAML instantly in your browser.

  Open