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JSON Formatter

100% Free

Beautify, minify, and sort-key JSON in real time. Surfaces parse errors with line + column. 100% client-side.

Real-time
Client-Side
RFC 8259
Indent
Output 
Type or paste JSON above…

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Add JSON Formatter to your website or blog in seconds.

  • Responsive design
  • Lightweight & fast
  • No backend required
  • Always up-to-date 
<iframe
  src="https://tools.town/embed/json-formatter/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="JSON Formatter">
</iframe>

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How to Use

  1. 1 Paste JSON into the input box (or click 'Load sample')
  2. 2 Pick indent: 2-space, 4-space, tab, or minify
  3. 3 Optionally toggle 'Sort keys alphabetically' for diff-friendly output
  4. 4 Output updates instantly — copy with one click

Features

  • Real-time formatting as you type
  • Four indent modes including minify (single-line)
  • Alphabetical key sort for deterministic diffs
  • Parse errors surface with line + column
  • Compression ratio shown when minifying
  • 100% client-side — your JSON never leaves the browser

Why it Matters

Properly formatted JSON is the difference between a 30-second debug and a 30-minute one. A fast, no-signup formatter beats every IDE plugin and online tool that hides ads, requires login, or limits payload size. This one runs entirely in your browser, handles megabyte-sized inputs, and never sees your data.

★★★★★

Use Cases

API Response Debug

Pretty-print a curl response to find the bug fast

Config File Cleanup

Sort keys alphabetically for cleaner git diffs

Bundle Minification

Strip whitespace before embedding JSON in code

Frequently Asked Questions

Does this validate the JSON, or just format it?
Both — invalid JSON shows the parse error with line and column. For richer validation stats (node count, depth, type counts) use the JSON Validator.
How big a JSON can I paste?
Up to your browser's textarea limit — usually 5-10 MB before noticeable lag. For larger files, use a CLI tool like `jq` or `prettier`.
Does sorting keys reorder arrays too?
No — only object keys are sorted. Array order is meaningful in JSON and is preserved.
Why is the minified output exactly the same as my input?
Your input was already minified. Minify mode strips all whitespace; if there was none to strip, the output looks identical.
📖

Want to understand the math?

Browse all guides →
How to Use JSON Formatter
json

How to Use JSON Formatter — Complete Guide

Learn how to beautify, validate, and minify JSON instantly using the free JSON Formatter on Tools.Town — no sign-up needed, runs entirely in your browser.

7 May 2026

5 min read

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