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JSON Formatter & Validator

Beautify, minify, and validate JSON instantly in your browser. No data is sent to any server.

Valid JSON ✓
Input JSON 0 chars · 0 lines
Output
Chars: 0 Lines: 0
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About This Tool

JSON Formatter & Validator

Beautify, minify, and validate JSON data instantly — paste raw JSON and get a perfectly formatted, readable structure.

Why Use This Tool?

  • Format minified JSON from API responses to read and understand it easily
  • Validate JSON before sending it to an API or saving it to a database
  • Minify formatted JSON for smaller payload sizes in production
  • Debug JSON configuration files, package.json, or API responses
  • Used by developers, testers, and data analysts working with JSON daily

Overview

JSON (JavaScript Object Notation) is the universal language of modern APIs and data exchange. Virtually every web API, mobile app, and configuration system uses JSON to communicate structured data. But raw JSON from APIs, databases, or configuration files is often minified into a single line with no whitespace — making it nearly impossible to read or debug. Our JSON Formatter and Validator tool instantly transforms messy, minified, or unformatted JSON into beautifully indented, colour-coded, human-readable output. It also validates your JSON — immediately flagging syntax errors like missing brackets, extra commas, or unquoted keys with precise error messages. You can also go in the other direction and minify formatted JSON for smaller payload sizes when sending data to APIs. This tool is used daily by developers working with REST APIs, engineers debugging data pipelines, students learning JSON structure, and system administrators managing JSON-based configuration files.

How to Use

  • 1

    Paste Your JSON

    Copy your raw or minified JSON string and paste it into the input text area on the left.

  • 2

    Choose Beautify or Minify

    Click Beautify to format it with proper indentation, or Minify to compress it to a single line.

  • 3

    Validate the JSON

    Click Validate to check for syntax errors. A green message confirms valid JSON; errors show the exact location of the problem.

  • 4

    Review the Output

    The formatted or minified JSON appears in the right panel, ready to use.

  • 5

    Copy or Download

    Click Copy to clipboard, or Download to save as a .json file.

Frequently Asked Questions

JSON is a text format derived from JavaScript object syntax, but with stricter rules: keys must be double-quoted strings, and values can only be strings, numbers, booleans, null, arrays, or objects.
Common JSON errors include: trailing commas after the last item, single quotes instead of double quotes, unquoted keys, or missing/extra brackets. The validator shows the exact line and character of the error.
The default is 2 spaces. You can change this to 4 spaces or tab indentation in the settings.
Yes. Copy the raw JSON from your browser's network tab, Postman, or curl output and paste it here to format it for easy reading.
The tool handles JSON files up to a few megabytes in the browser. Very large JSON (>10 MB) may be slower to process.

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