JSON Formatter
Free online JSON formatter to beautify, minify, and validate JSON. Supports syntax highlighting and instant preview.
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 is designed to be the fastest, most privacy-respecting option available online. Unlike many alternatives, our tool processes everything directly in your browser — your data never touches our servers.
Whether you're a developer debugging an API, a student learning developer concepts, or a professional working with sensitive data, JSON Formatter provides a reliable, zero-cost solution with no registration required.
Built with modern web standards and optimized for performance, the tool loads instantly and works across all devices — desktop, tablet, and mobile. It even works offline after the initial page load.
100% Free
No subscriptions, no paywalls, no hidden costs
Privacy First
All processing happens in your browser
Lightning Fast
No server latency, instant results
No Signup
Start using immediately, no account needed
Frequently Asked Questions
What is JSON formatting?â–¼
JSON formatting makes JSON code readable by adding proper indentation and spacing. It's useful for debugging and sharing code.
Is my data private?â–¼
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}Related Tools
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