JSON Formatter

Paste JSON to format, validate and beautify. Runs in your browser — data stays private.

Input JSON

1

Formatted JSON

Output appears here…

2sp · UTF-8

What is a JSON Formatter?

A JSON formatter (also called a JSON beautifier or pretty printer) takes compact or minified JSON and adds proper indentation and line breaks, making it easy to read. Minified API responses that arrive as a single unreadable line become structured, hierarchical and scannable in one click.

How to Format JSON

1Paste your raw or minified JSON into the left input panel
2Click Format or press Ctrl + Enter
3Formatted JSON appears in the right output panel instantly
4Click Copy or Download to save your result

Example

Input (minified):

{"name":"Ravi","age":28,"city":"Surat","active":true}

Output (formatted with 2 spaces):

{
  "name": "Ravi",
  "age": 28,
  "city": "Surat",
  "active": true
}

Features

Live validation

Errors highlighted as you type with exact line and column

Syntax highlighting

Keys, strings, numbers and booleans in distinct colours

Collapsible nodes

Fold any object or array to focus on the parts you need

Tree view

Switch to an interactive tree to explore nested structure

Sort keys

Alphabetically sort all keys at every nesting level

Session auto-save

Your last JSON is restored automatically when you return

Common JSON Errors

Missing comma — Add a comma after every property except the last one

Trailing comma — Remove the comma after the last property or array item

Single quotes — Replace all ' with " — JSON requires double quotes

Unquoted keys — Wrap every key in double quotes: name → "name"

undefined or NaN — Replace with null — these values are not valid JSON

Frequently Asked Questions

Yes. All JSON processing happens entirely in your browser using JavaScript. Your data is never sent to our servers.

You can choose between 2 spaces, 3 spaces and 4 spaces. 2 spaces is the most common convention used by JavaScript and most REST APIs.

There is no hard limit. Files up to several megabytes work without slowdown because processing runs in your browser.

Paste the URL into the input — the formatter will detect it and offer to load the JSON from that endpoint.