Color-coded keys, strings, numbers, and booleans for easy reading
Detailed error messages with line and column numbers to quickly find issues
Beautify with custom indentation or minify to reduce file size instantly
All processing happens in your browser. Your JSON data never leaves your device
Indent:
View:
Our free JSON formatter and validator helps developers quickly format, validate, and debug JSON data. Whether you're working with API responses, configuration files, or data structures, our tool provides instant formatting with syntax highlighting and comprehensive error detection.
Unlike other JSON tools that send your data to servers, our formatter processes everything locally in your browser. This means your API keys, credentials, and sensitive data in JSON responses stay completely private. Plus, it works offline once the page is loaded.
Yes, all JSON processing happens entirely in your browser. Your data is never sent to any server, making it safe to format JSON containing API keys, tokens, or other sensitive information.
You can format JSON with 2-space, 4-space, or tab indentation. You can also minify JSON to remove all whitespace, which is useful for reducing file size in production.
While the tool cannot automatically fix all JSON errors, it provides detailed error messages with line and column numbers to help you quickly locate and fix syntax issues.
The tree view visualizes your JSON as a collapsible, hierarchical structure. You can expand and collapse objects and arrays to explore complex nested data easily.
Since processing happens in your browser, there's no server-imposed limit. However, very large JSON files (over 10MB) may cause slower performance depending on your device.
Yes, you can upload .json files using the upload button. The tool will automatically load and display the file contents for formatting or validation.
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