Free JSON Viewer & Formatter Online

Our JSON Viewer and Formatter is a powerful online tool that helps you view, format, validate, and minify JSON data. Essential for developers, data analysts, and anyone working with JSON APIs.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It's the most common format for web APIs and configuration files.

Features of Our JSON Tool

Format/Beautify - Transform minified JSON into readable, indented format
Minify - Compress JSON by removing whitespace for smaller file sizes
Validate - Check JSON syntax and identify errors with line numbers
Customizable indentation - Choose 2 spaces, 4 spaces, or tabs
Large file support - Handle JSON files of any size
Client-side processing - Your data never leaves your browser

How to Use the JSON Viewer

Format JSON

Paste your JSON data into the input field
Select your preferred indentation (2 or 4 spaces)
Click "Format / Beautify"
Copy the formatted result

Minify JSON

Paste your formatted JSON
Click "Minify"
Copy the compressed result

Validate JSON

As you format, any syntax errors will be displayed with helpful error messages.

JSON Syntax Reference

Basic Structure

{
  "name": "value",
  "number": 42,
  "boolean": true,
  "null": null,
  "array": [1, 2, 3],
  "object": {"nested": "value"}
}

Data Types

Type	Example
String	`"hello"`
Number	`42`, `3.14`
Boolean	`true`, `false`
Null	`null`
Array	`[1, 2, 3]`
Object	`{"key": "value"}`

Common JSON Errors

Trailing Commas

JSON does not allow trailing commas after the last item in arrays or objects.

Single Quotes

JSON requires double quotes for strings. Single quotes are not valid.

Unquoted Keys

All object keys must be quoted strings in JSON.

FAQs About JSON Formatter

Is my JSON data secure?

Yes! All processing happens locally in your browser. Your data is never sent to any server.

What's the maximum file size?

There's no hard limit, but very large files (10MB+) may be slower to process in the browser.

Can I format JSON with comments?

Standard JSON does not support comments. You would need to remove comments first.

What's the difference between JSON and JavaScript objects?

JSON is a text format based on JavaScript object syntax, but with stricter rules (quoted keys, no trailing commas, no functions).

Use Cases for JSON Formatter

API debugging - Format API responses for easy reading
Configuration editing - Clean up config files
Data inspection - Analyze data structures
Documentation - Create readable examples
Log analysis - Parse JSON log entries

Why Choose Our JSON Viewer?

Free forever - No registration or payment needed
Privacy first - No data leaves your browser
Fast and reliable - Instant formatting
Mobile friendly - Works on any device
No installation - Use directly in your browser

JSON Viewer & Formatter | Lembog

JSON Viewer & Formatter