Does this tool validate JSON?

Yes. If your JSON has syntax errors, the tool shows the exact error message including the position of the problem, helping you fix it quickly.

What indentation does the formatter use?

The formatter uses 2-space indentation, which is the most common standard for JSON files in modern development.

Can I format large JSON files?

Yes. Since everything runs in your browser, it can handle large JSON payloads. Performance depends on your device but typical JSON files process instantly.

Is my JSON data secure?

Absolutely. Your JSON never leaves your browser. There is no server processing — everything happens client-side in your device's memory.

What is the difference between Format and Minify?

Format (prettify) adds indentation and line breaks for readability. Minify removes all unnecessary whitespace to reduce file size, which is useful for production API payloads.

Can this tool validate JSON?

Yes. When you paste invalid JSON, the tool highlights the error and shows a descriptive message indicating what went wrong and where, so you can fix syntax issues before using the data.

What indentation style is used?

The formatter uses 2-space indentation by default, which is the most widely adopted standard in JavaScript and TypeScript projects. Minify mode removes all indentation entirely.

Is there a size limit for JSON input?

There is no fixed limit. The tool processes JSON entirely in your browser, so it can handle large payloads. Performance depends on your device’s available memory, but typical API responses and config files format instantly.

Can I minify JSON with this tool?

Yes. Click the Minify button to strip all whitespace and line breaks from your JSON, producing the most compact representation. This is useful for reducing payload size in production environments.

JSON Formatter & Validator Online — Free

Format, validate, and beautify JSON online for free. Instant formatting with syntax highlighting.

Format, validate, and beautify JSON data in one click. Whether you're debugging a messy API response, cleaning up a configuration file, or validating JSON before deploying, this tool makes it effortless. Paste your raw JSON, and get perfectly indented output — or minify it for production use.

All processing happens in your browser, so sensitive API payloads and config files never leave your device. Need to encode data for an API call? Try the Base64 Encode & Decode tool.

Input (raw JSON)

Output (formatted)

How to Format JSON Online

Paste your JSON
Paste your raw JSON into the input panel on the left. It can be minified, messy, or partially formatted.
Format or minify
Click 'Format' to prettify with 2-space indentation, or 'Minify' to compress it into a single line.
Copy the result
Click 'Copy Output' to copy the formatted JSON to your clipboard, ready to use in your project.

Common Use Cases

Debug API Responses
Paste a raw API response to instantly see its structure with proper indentation, making it easy to locate fields and values.
Format Configuration Files
Clean up messy package.json, tsconfig.json, or other config files into readable, consistently indented JSON.
Validate Before Deployment
Catch syntax errors in JSON configuration files before pushing to production. The validator pinpoints the exact error location.
Clean Up Minified JSON
Transform single-line minified JSON into a human-readable format for code reviews, documentation, or debugging sessions.

Why Use PDFFlare JSON Formatter?

Instant Formatting

Paste your JSON and get perfectly indented output in milliseconds. No loading screens, no waiting.

Error Detection

Invalid JSON? The tool shows the exact error message with position details so you can fix syntax issues fast.

Format & Minify

Switch between pretty-printed (2-space indent) and minified output with a single click.

100% Client-Side

Your data stays on your device. No server uploads means sensitive API responses and configs remain private.

Frequently Asked Questions About JSON Formatting

Hash Generator

MD5, SHA-1, SHA-256 hashes

Base64 Encode/Decode

Encode and decode Base64 strings

URL Encode/Decode

Encode and decode URLs

Color Converter

Convert HEX, RGB, HSL colors

QR Code Generator

Generate QR codes from text or URLs

Markdown to HTML

Convert Markdown to HTML

How to Format JSON Online

Paste your JSON

Format or minify

Copy the result