📋 Dev Tool

JSON Formatter & Validator

Beautify, minify and validate JSON instantly. Syntax highlighting, tree view, error detection and one-click copy.

Indent:
💬 Paste your JSON and click Beautify — or start typing.
Quick load:
INPUT
OUTPUT
Your formatted JSON will appear here…

JSON Formatter features

This tool covers the full JSON workflow — from raw paste to production-ready output. Everything processes locally in your browser; no data is ever sent to a server.

✨ Beautify / Pretty-print

Adds proper indentation and line breaks to compressed JSON, making it human-readable. Choose 2 spaces, 4 spaces, or tab indentation.

⬇ Minify

Strips all unnecessary whitespace from JSON to produce the smallest possible output — ideal for network transmission and storage.

✔ Validate

Instantly detects syntax errors with exact line and position information. Common mistakes like trailing commas and single quotes are identified.

🌲 Tree View

Visualise JSON as a collapsible tree — perfect for exploring deeply nested structures without getting lost.

Frequently asked questions

A JSON formatter (also called JSON beautifier or pretty-printer) takes compressed or poorly indented JSON and adds proper whitespace and line breaks to make it human-readable.
Paste your JSON and click Validate. If valid, a green success message appears. If invalid, the error message shows the exact line and character position of the syntax problem.
JSON minification removes all unnecessary whitespace and line breaks to reduce file size. Minified JSON is smaller for network transfer but hard for humans to read.
Common errors: missing commas between items, unquoted or single-quoted property keys, trailing commas after the last element, missing or extra closing brackets/braces, and using undefined or NaN as values.
Yes — 100%. All processing happens entirely in your browser using JavaScript. No data is sent to any server. Your JSON never leaves your device.
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