JSON Formatter & Validator

Format, beautify, validate, and minify your JSON data instantly with syntax highlighting, line numbers, and collapsible tree view.

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How to Use This JSON Formatter

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.
Format for readability: Click "Format" to beautify your JSON with proper indentation. Line numbers help you navigate large documents.
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.
Find errors easily: Invalid JSON highlights the error line in red, with a detailed message showing exactly where the problem is.
Minify for production: Click "Minify" to compress your JSON into a single line for smaller file sizes.
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.

Related Tools

Need to convert JSON to another format? Try the JSON to YAML Converter or JSON to CSV Converter. Working with XML data? Use the XML to JSON Converter to transform it into JSON format.