Smart JSON Formatter & Diff Checker
Format, beautify, minify, sort, and auto-repair broken JSON. Compare two JSON or text payloads side-by-side with line diffing.
💾Local Result Cache Ready — Save or restore your last state in browser memory.
Valid JSON
Size: 0 BKeys: 0Max Depth: 0
+0 Additions-0 Removals
Diff output will appear here after clicking "Run Line-by-Line Diff".
SwiftLemon 100% Local Privacy Guarantee
JSON payloads and sensitive API responses are parsed strictly in local browser RAM. No text is ever transmitted.
Zero Server Uploads
In-Memory Browser Execution
Works Offline Once Loaded
Frequently Asked Questions
Is it safe to paste sensitive API keys or JSON tokens?
Yes. The parser and diff engine run entirely in your local browser JavaScript engine. No data is logged or sent over the network.
What common errors can the auto-repair fix?
It corrects trailing commas in objects and arrays, converts single quotes to valid JSON double quotes, and quotes raw keys.
How does the diff checker compare structures?
It normalizes and compares lines sequentially, highlighting added lines in green and removed lines in red.
