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JSON Formatter
Format and validate JSON data with beautification, compression, sorting and more.
JSON Formatter - Input JSON
JSON Formatter Tool Guide
JSON Formatter is a free online tool that quickly formats and validates JSON data. Supports various formatting options including pretty printing (format JSON to readable format), compression (remove all spaces and line breaks), key sorting (sort object keys alphabetically), Unicode escaping (escape Unicode characters to \u format), etc. Real-time formatting with instant results. Provides detailed statistics including character count, line count, key count, nesting depth, etc. All processing is done locally in your browser, JSON data is never uploaded to the server, fully protecting your privacy and data security.
Multiple formatting options for flexible configuration
100% local processing, privacy and security
Real-time formatting with instant feedback
Tool Features
Comprehensive Formatting Options
Supports various formatting options that can be flexibly configured according to needs. Basic options: pretty print (format JSON to readable format with 2-space indentation), compress (remove all spaces and line breaks to generate compact format). Advanced options: sort keys (recursively sort all object keys alphabetically, including nested objects), escape Unicode (escape non-ASCII characters to \uXXXX format, suitable for scenarios requiring ASCII encoding). All options can be combined, take effect in real-time, results update immediately after changes.
Detailed Statistics and Error Feedback
Provides detailed statistics including character count (total characters in JSON string), line count (total lines after formatting), key count (total number of all object keys, including nested objects), nesting depth (maximum nesting level of JSON structure). Statistics are displayed in colorful cards for clarity and intuitiveness. If JSON format is incorrect, detailed error information is displayed including error type and error description to help quickly locate and fix issues. Statistics and validation information update in real-time, recalculating after each JSON or option modification.
Convenient Operations and Result Management
Provides clear input and output areas, displayed in monospace font, supports large JSON data formatting. Formatted results are displayed in real-time in the output area for easy viewing and comparison. Supports one-click copying of formatted results for use in other purposes. Provides clear function to quickly reset input and output areas. Provides swap function to quickly swap output results to input area for further processing. All operations have clear visual feedback for smooth user experience.
How to Use
- 1
Enter or Paste JSON Data
Enter or paste the JSON data you want to format in the input area. The tool supports various JSON formats including compressed format (no spaces and line breaks), beautified format (already formatted), unformatted JSON, etc. JSON formatting and validation is automatically triggered after input, no button clicking required. If JSON format is incorrect, detailed error information will be displayed in the error area.
- 2
Configure Formatting Options
Select the options you need in the formatting options area. Basic options: pretty print (enabled by default, format JSON to readable format with 2-space indentation), compress (remove all spaces and line breaks). Advanced options: sort keys (recursively sort all object keys alphabetically), escape Unicode (escape non-ASCII characters to \uXXXX format). After selecting options, formatting results will be updated immediately. Note: pretty print and compress options are mutually exclusive, only one can be selected.
- 3
View Statistics and Copy Results
After formatting is complete, you can view statistics cards to understand JSON's character count, line count, key count, nesting depth, etc. You can click the "Copy" button to copy formatted results, or click the "Swap" button to swap output results to input area for further processing, or click the "Clear" button to clear input and output content. Formatted JSON has clear indentation and structure for easy reading and understanding.
Frequently Asked Questions
What formatting options are supported?
The tool supports 4 formatting options: basic options (pretty print, compress) and advanced options (sort keys, escape Unicode). Pretty print and compress options are mutually exclusive, only one can be selected. Sort keys and escape Unicode can be combined with other options. For example, you can select pretty print and sort keys to apply both effects simultaneously; or select compress and escape Unicode to generate compact ASCII-encoded format. All options take effect in real-time, results update immediately after changes.
Will my JSON data be uploaded to the server?
No, all processing is done in your browser. Your JSON data never leaves your device, fully protecting your privacy.
What should I do if JSON format validation fails?
If JSON format validation fails, the tool will display detailed error information in the error area, including error type and error description. Common errors include: syntax errors (such as missing comma, extra comma, unclosed brackets), missing quotes for key names, unclosed strings, invalid escape characters, etc. You can quickly locate and fix issues based on error information. After fixing, JSON will automatically re-validate and format. The tool automatically validates JSON format on each input or modification.
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