JSON Formatter

格式化、验证和压缩JSON数据。

输入

输出

Indent:

Beautify & Minify

Format JSON with customizable indentation (2 spaces, 4 spaces, or tabs), or compress it into a single minified line.

Validate

Instantly detect syntax errors with clear, actionable error messages showing exactly where the problem is.

Syntax Highlighting

Color-coded JSON output for easy reading — keys, values, strings, and numbers are visually distinct.

Private & Client-side

All processing happens in your browser. Your JSON data is never uploaded to any server.

关于JSON Formatter

JSON (JavaScript Object Notation) is the most widely used data interchange format in modern web development. Whether you're working with REST APIs, configuration files, or debugging application data, having a reliable JSON formatter saves significant time. Our JSON Formatter parses your raw JSON string, identifies any syntax errors immediately, and outputs a neatly indented, human-readable version — or a compact minified version for production use. It supports all valid JSON types including objects, arrays, strings, numbers, booleans, and null values.

如何使用JSON Formatter

Paste your raw or minified JSON into the left input panel, or click "Load Sample" to try an example.
Choose your preferred indentation level — 2 spaces, 4 spaces, or tabs — using the Indent selector.
Click "Format" to beautify the JSON with proper indentation and line breaks.
Click "Minify" to compress the JSON into a single line for smaller file sizes.
If there are any syntax errors, a red error message will appear describing exactly what is wrong.
Click "Copy" to copy the formatted or minified output to your clipboard.

常见问题

Is my JSON data sent to a server?

No. The JSON Formatter runs entirely in your browser using JavaScript. Your data is never uploaded, stored, or transmitted to any server. This makes it safe to format sensitive API responses or configuration files.

What is the difference between formatting and minifying JSON?

Formatting (beautifying) adds indentation and line breaks to make the JSON structure easy for humans to read and understand. Minifying removes all whitespace to produce the smallest possible file size, which is preferred for network transmission and production environments.

Why is my JSON showing an error?

Common JSON errors include trailing commas (e.g., the last item in an array or object has a comma), unquoted keys (JSON requires all keys to be double-quoted strings), single quotes instead of double quotes, or missing colons between keys and values.

Can I format JSON with comments?

Standard JSON does not support comments. If your JSON contains comments (often called JSON5 or JSONC format), you will need to remove them before formatting. Some editors like VS Code support JSONC files natively.

What indentation style should I use?

2 spaces is the most common style used by tools like Prettier and is recommended for most projects. 4 spaces is common in Python and some older JavaScript style guides. Tab indentation is preferred in some teams because it allows each developer to choose their preferred tab width in their editor.