JSON Formatter, Validator & Minifier

Format, beautify, validate, and inspect JSON payloads with line-accurate error highlighting.

Tool Guide

JSON Formatter, Validator & Minifier: What It Does

Parses JSON text in your browser, highlighting syntax errors with exact line and column numbers. It formats valid payloads with 2-space, 4-space, or tab indentation, and strips whitespace when you need minified payloads.

Example

Input
{"b":2,"a":1}
Output
{
  "b": 2,
  "a": 1
}

Indents nested keys with 2 spaces while preserving key ordering.

How to Use

  1. Paste raw JSON into the editor or load sample data.
  2. Choose 2 spaces, 4 spaces, or tab indentation in the toolbar.
  3. Click Format to beautify or Minify to compact the output.
  4. Copy the result to your clipboard or download it as a .json file.

Limitations

  • Payloads larger than 50 MB can slow down memory-constrained browser tabs.
  • Strict parsing rejects trailing commas and single-quoted keys per RFC 8259.

Frequently Asked Questions

Why does the formatter reject trailing commas?

Standard JSON (RFC 8259) forbids trailing commas in objects and arrays. If your input originates from JavaScript or JSON5, remove commas before validating.

Does formatting preserve duplicate object keys?

The browser JSON parser preserves only the last occurrence when duplicate keys share an object scope.

Command-Line Equivalent
cat payload.json | jq .

Pretty-print JSON with jq in the terminal.

Embed or Cite JSON Formatter, Validator & Minifier

Embed this interactive utility directly into documentation or blog posts, or link via GitHub badge:

Free for Blogs & Docs
HTML Embed Code (iframe):
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Markdown / README Badge:
[![JSON Formatter, Validator & Minifier](https://img.shields.io/badge/Mango%20Developer-JSON%20Formatter%2C%20Validator%20%26%20Minifier-orange?style=flat&logo=code)](https://filexshare.com/developer/json-formatter)

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Inputs stay in browser memory. No external request is required for this operation, and zero data leaves your device.