JSON Formatter & Validator

How to Use This JSON Formatter

1. Paste or type your JSON: Enter your JSON data into the editor. Live syntax highlighting shows keys, strings, numbers, booleans, and null values in different colors as you type.
2. Format for readability: Click "Format" to beautify your JSON with proper indentation. Line numbers help you navigate large documents.
3. View as tree: Click "Tree" to see a collapsible tree view. Click the arrows to expand or collapse objects and arrays. Use "Expand All" and "Collapse All" buttons to control the entire tree.
4. Find errors easily: Invalid JSON highlights the error line in red, with a detailed message showing exactly where the problem is.
5. Minify for production: Click "Minify" to compress your JSON into a single line for smaller file sizes.
6. Copy the result: Click "Copy" to copy the JSON to your clipboard.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. Originally derived from JavaScript, JSON has become language-independent and is now supported by virtually every programming language.

JSON supports two fundamental data structures: objects (key-value pairs in curly braces {}) and arrays (ordered lists in square brackets []). These can be nested to represent complex hierarchical data.

JSON Syntax Rules

Objects: {"key": "value", "number": 42} - Keys must be strings in double quotes.

Arrays: ["item1", "item2", 3] - Values separated by commas.

Strings: Must use double quotes. Single quotes are invalid.

Numbers: Integers or decimals, with optional scientific notation.

Booleans: true or false (lowercase only).

Null: null (lowercase) represents empty values.

Common JSON Errors

Trailing commas: JSON doesn't allow commas after the last item.

Single quotes: Use double quotes for all strings and keys.

Unquoted keys: All object keys must be quoted strings.

Comments: Standard JSON doesn't support comments.