JSON Formatter

Free online JSON formatter to beautify, minify, and validate JSON. Supports syntax highlighting and instant preview.

developerBrowser-FirstNo Signup Required

In-Browser Processing: Runs entirely on your device via client-side JavaScript. Inputs are never transmitted or stored.

Input JSON

Format Style

Output JSON

Public API

Endpoint:

/api/format/json

Windows CMD:

curl -G "http://localhost:3000/api/format/json" ^\n  --data-urlencode "input={\"name\":\"John\",\"age\":30}" ^\n  --data-urlencode "style=pretty"

Bash/Mac/Linux:

curl -G 'https://yourdomain.com/api/format/json'   --data-urlencode 'input={"name":"John","age":30}'   --data-urlencode 'style=pretty'

Example fetch (browser):

const json = JSON.stringify({ name: 'John', age: 30 });
const res = await fetch('/api/format/json?input=' + encodeURIComponent(json) + '&style=pretty');
const data = await res.json();
console.log(data.result);

💡 Tip:Paste invalid JSON to see helpful error messages. Use "Format" for pretty printing or "Minify" to reduce file size.

How to Use JSON Formatter

Open the JSON Formatter tool on toollabs.in — no signup or download required.

Paste or type your input into the editor area. The tool processes everything locally in your browser for maximum privacy.

View the output instantly. Copy the result to your clipboard, download it, or continue working with the formatted data.

All processing happens client-side. Your data never leaves your device, making it safe for sensitive codebases.

Why Use JSON Formatter?

JSON Formatter on toollabs.in processes your data directly in your browser using client-side Web APIs. Your files, documents, and inputs never leave your device.

Whether you are formatting data payloads, converting formats, or inspecting structures during development, JSON Formatter gives you instant feedback with no installation required.

Built with modern web standards and responsive layouts, JSON Formatter runs smoothly across desktop and mobile devices without requiring extra plugins or software installation.

✓

100% Free

No subscriptions, no paywalls, no hidden costs

✓

Privacy First

All processing happens in your browser

✓

Lightning Fast

No server latency, instant results

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No Signup

Start using immediately, no account needed

Frequently Asked Questions

What is JSON formatting?▼

JSON formatting makes JSON code readable by adding proper indentation and spacing. It's useful for debugging and sharing code.

Is my data private?▼

Yes, all processing happens in your browser. Your data is never sent to our servers.

Use Cases

API Debugging

Quickly format API responses to understand data structure

Code Review

Make JSON readable before sharing with team members

Configuration Files

Validate and format JSON configuration files

Examples

Minify JSON

Input:

{
  "name": "John",
  "age": 30
}

Output:

{"name":"John","age":30}

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