JSON Formatter
Free online tool to format and validate JSON data
Input 0 B
Result 0 B
What is a JSON Formatter?
A JSON (JavaScript Object Notation) formatter is a tool that organizes complex or minified JSON data into a human-readable format. It is useful for developers analyzing API responses or editing configuration files, and it automatically detects JSON syntax errors and indicates their exact location.
How to Use
- Paste or type JSON data in the left input area.
- Click the "Format" button to display the formatted result on the right.
- Use the "Compress" button to remove unnecessary whitespace and reduce data size.
- You can copy the result to clipboard using the "Copy" button.
Frequently Asked Questions
No. All processing is done in the browser, and the entered data is not transmitted to any external server. You can safely use it with sensitive data.
Since it is processed in the browser, there is theoretically no limit, but very large JSON data (tens of MB or more) may affect browser performance. It works fine for typical API responses and configuration files.
When you click the format button, if there is an error, its location (line, column) will be shown. Common errors include trailing commas after the last item, use of single quotes, and missing quotes on keys. Refer to the error message and fix the syntax at the indicated location.
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