GainUtility's JSON toolkit helps developers format, validate, compare, and transform JSON data — all processed locally in your browser. No data ever leaves your device.
Which JSON job do you have?
Pick the job rather than the tool name. Each one runs in your browser, so your payload is never uploaded.
Format and beautify JSON — Prettify a minified response with consistent indentation and syntax highlighting.
Validate JSON — Catch syntax errors with the line number and character position.
Read JSON as a tree — Expand and collapse nested objects and arrays instead of scanning raw text.
What You Can Do
Format & Beautify — Prettify minified JSON with syntax highlighting and custom indentation.
Validate & Debug — Find syntax errors with line numbers and character positions for quick debugging.
Compare & Diff — Side-by-side comparison to spot structural differences between JSON objects.
Convert Data — Transform JSON to CSV, or convert CSV/XML to JSON format.
How to Use
Choose the JSON tool you need from the collection.
Paste or type your JSON data into the editor.
Use the tool's features — format, validate, compare, or convert.
Copy the result or download it as a file.
Frequently Asked Questions
Is my JSON data sent to a server?
No. All JSON processing happens entirely in your browser. Your data never leaves your device.
What JSON features are supported?
Full JSON specification support including nested objects, arrays, unicode strings, and numeric types.