Free Developer Tool
JSON Formatter
Beautify or minify your JSON data instantly. Format with custom indentation, validate syntax, and sort keys alphabetically. 100% client-side processing - your data never leaves your browser.
Invalid JSON
Quick Usage Guide
Beautify vs Minify
Beautify adds indentation and line breaks for readability. Minify removes all whitespace to reduce file size for production use.
Sort Keys
Enable Sort Keys to alphabetically order object keys. Useful for comparing JSON files or maintaining consistent key ordering.
JSON Basics
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. JSON is language-independent and widely used for APIs and configuration files.
Valid JSON Data Types
JSON supports six data types: string,
number, boolean,
null, object,
and array. Strings must use double quotes.
Why Minify JSON?
Minified JSON removes unnecessary whitespace, reducing file size by 10-30%. This improves load times for web applications and reduces bandwidth usage when transmitting data over networks.
Common JSON Errors
Most JSON errors come from: trailing commas after the last item, single quotes instead of double quotes, unquoted keys, or missing commas between items. This tool helps identify and locate syntax errors.
JSON Syntax Examples
| Type | Example | Notes |
|---|---|---|
| String | "Hello World" | Must use double quotes |
| Number | 42, 3.14, -17 | No quotes, supports decimals |
| Boolean | true, false | Lowercase only |
| Null | null | Represents empty/no value |
| Object | {"key": "value"} | Keys must be quoted strings |
| Array | [1, 2, 3] | Ordered list of values |
Common Use Cases
API Development
Format API responses for debugging or minify request payloads to reduce bandwidth. Essential for REST and GraphQL development.
Configuration Files
Edit package.json, tsconfig.json, or other config files. Beautify for editing, validate syntax before saving.
Data Validation
Quickly validate JSON syntax before importing into databases or using in applications. Catch errors early in development.
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