JSON Toolbox
Free online tools to format, minify, validate, and compare JSON
How to Use the JSON Toolbox
- 1
Paste or upload your JSON
Copy your JSON data into the input panel, or drag and drop a .json file directly. The editor accepts any valid or invalid JSON for validation.
- 2
Choose your operation
Switch between tabs to format (beautify with indentation), minify (remove whitespace), validate (check syntax), or diff (compare two JSON objects side by side).
- 3
Copy or download the result
Click the copy button to send the output to your clipboard, or download the result as a .json file. All processing runs locally in your browser — nothing is uploaded.
Frequently Asked Questions
What can the JSON Toolbox do?
Format (beautify), minify, validate, and compare (diff) JSON data — all free and in-browser.
Can I validate JSON with error messages?
Yes. The validator shows exact line numbers and clear error messages for any invalid JSON.
Does it work with large JSON files?
Yes. Processing runs entirely in your browser so there's no upload limit or server timeout.