JSON Formatter & Beautifier

Format, beautify, and validate JSON. Handles JS objects, escaped strings, and co...

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Quick answer

A JSON formatter beautifies raw JSON by adding consistent indentation and line breaks, and validates it as you type. YaliKit's version formats live with no button, auto-fixes unquoted keys, single quotes, trailing commas, and JSONC comments, and offers a collapsible tree view and minify mode. It runs entirely in your browser.

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Formatter Features

Valid JSON - Standard JSON with quoted keys and proper syntax
JS Objects - Handles unquoted keys and single quotes
Escaped Strings - Console output and escaped text formatting
Tree View - Collapsible tree navigation for nested data
Minify Mode - Remove all whitespace for production use
Handles Comments (JSONC) - Strips // and /* */ comments many formatters reject
One-Click Copy - Copy formatted output to clipboard instantly
Download as .json - Save the formatted result straight to a .json file

Why Use JSON Formatter & Beautifier?

Handles Broken JSON

Fixes unquoted keys, single quotes, trailing commas and // /* */ comments (JSONC), converting JS objects to valid JSON automatically.

Console Output Support

Paste escaped strings with \n, \t, and [Object] placeholders directly from your console.

Collapsible Tree View

Navigate nested JSON easily with an interactive, collapsible tree structure.

100% Client-Side

Your data never leaves your browser. No uploads, no servers, completely private.

Format & Minify

Beautify JSON with proper indentation or minify to remove all whitespace for production.

Instant Results

Real-time formatting with no delays. Paste your JSON and get results immediately.

Common Uses for JSON Formatter

API Debugging

Format API responses to quickly identify issues in nested data structures.

Config Management

Beautify configuration files for review or minify them for production deployment.

Code Development

Convert JavaScript objects to valid JSON for use in APIs and data files.

Log Analysis

Format escaped JSON from server logs and console output for easy reading.

How It Works

1

Paste Your JSON Data

Copy JSON from APIs, console, or code. We handle escaped strings and JS objects too.

2

It Formats Live: No Button Needed

Valid JSON beautifies instantly as you type, and invalid JSON is flagged with the exact line and column. Hit Minify to collapse to one line, or switch between 2 and 4-space indent.

3

Copy or Download the Result

Use Tree view to navigate or Text view to copy. One-click copy to clipboard, or download as a .json file.

Tips & Best Practices

Use Tree View for Large JSON

Tree view lets you collapse and expand sections, making it easier to navigate large JSON structures.

Minify for Production

Use the Minify button to remove all whitespace before sending JSON in API requests or storing in production.

JS Objects Supported

You can paste JavaScript objects with unquoted keys - the formatter will automatically convert them to valid JSON.

Frequently Asked Questions

Formatting JSON adds consistent indentation and line breaks so nested objects and arrays are easy to read, without changing the data itself. It's also called beautifying or pretty-printing. The opposite is minifying, which strips whitespace to shrink the payload for production.
Just paste your JSON into the input box, it beautifies live as you type, with proper indentation and color-coded syntax highlighting. No button to hunt for. It works with messy JSON, JavaScript objects, and escaped console strings too.
Yes! YaliKit automatically fixes common issues like unquoted keys, trailing commas, single quotes, and even // and /* */ comments (JSONC). It can convert JavaScript object notation to valid JSON.
Paste the object as-is: unquoted keys, single quotes, and trailing commas are all repaired automatically and rewritten as valid, double-quoted JSON. Great for turning a console.log dump or a code snippet into proper JSON in one step.
Format (beautify) adds indentation and line breaks for readability. Minify removes all whitespace to reduce file size - useful for production or APIs.
Absolutely. All formatting happens entirely in your browser using client-side JavaScript. Your data never leaves your device or gets sent to any server.
You can choose between 2-space and 4-space indentation. The formatter uses VS Code-style formatting that keeps short arrays and objects on a single line for readability.
Yes! The formatter automatically handles escaped newlines (\n), tabs (\t), and quoted strings. Just paste the raw output from your console or logs.
Yes. As you type, invalid JSON is flagged instantly with a plain-English message and the exact line and column of the problem, so you can spot a missing comma, bracket, or quote at a glance instead of hunting through the whole document.

Related Tools

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Explore JSON in a collapsible tree

JSON Editor

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Compare two JSON objects and find differences

JSON to CSV

Convert JSON arrays to CSV format