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JSON Formatter

Format, beautify, and compress JSON data with real-time syntax checking and error detection

Smart FormattingReal-time ValidationOne-click CompressionCode FoldingSyntax HighlightingConvenient Operations

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Input JSON

Auto

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Formatted JSON

Usage Instructions

Input JSON Data

Paste or input JSON text in the left input box. Supports JSON and JSONC formats, including comments.

Auto Formatting

Enable 'Auto Format' switch for real-time formatting. You can also click the 'Format' button to trigger manually.

Compression and Beautification

Click the 'Compress' button to compress JSON into one line, click again to restore beautified format. Supports one-click download of formatted files.

Code Folding

Use the fold icon to fold/unfold JSON data by level, making it easier to view the structure of large JSON files.

Fullscreen Mode

Click the fullscreen icon to toggle fullscreen mode, providing a larger editing space suitable for handling complex JSON data.

Error Tips

If the input JSON format is incorrect, detailed error information will be displayed, including error location and cause, helping to quickly locate issues.

Keyboard Shortcuts

Ctrl + ASelect all text

Ctrl + CCopy content

Ctrl + VPaste content

Ctrl + ZUndo operation

Core Features

Smart Formatting

Automatically recognize JSON structure, provide beautiful indentation and line breaks

Real-time Validation

Instantly check JSON syntax, provide precise error location hints

One-click Compression

Quickly compress JSON into a single line, reduce file size

Code Folding

Support folding/unfolding by level, convenient for viewing large JSON

Syntax Highlighting

Different data types use different colors, improving readability

Convenient Operations

Support copy, download, fullscreen and other practical functions

JSON Introduction

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format. It is based on a subset of the JavaScript programming language, but its use is not limited to JavaScript. JSON is a completely language-independent text format that is easy for humans to read and write, and also easy for machines to parse and generate.

History of JSON

JSON was first proposed by Douglas Crockford in 2001. It was initially developed as a subset of JavaScript but was quickly adopted as an independent data format. In 2006, JSON was officially standardized as ECMA-404 and became ISO/IEC 21778:2017 in 2013.

JSON Features

Lightweight: JSON format is more concise than XML, with smaller data volume
Readability: JSON format is easy for humans to read and write
Cross-platform: Supports multiple programming languages and platforms
Self-describing: Clear data structure, easy to understand
Efficient: Fast parsing and generation

Code Examples

// JavaScript Example
const jsonString = '{"name":"John","age":25}';
const formatted = JSON.stringify(JSON.parse(jsonString), null, 2);
console.log(formatted);