Free online tool to compare two JavaScript files and find difference.

Compare and find difference in two JavaScript files easily for free. Just paste or enter original and modified JavaScript code in respective editors and click 🔍 Compare button to get diff.
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How to compare JavaScript files/code side by side & View Diff

Copy the original JavaScript code in the block on the left and modified JavaScript code in the right block. Just click Check button to view side by side comparison.

Online JavaScript Diff Tool Features

Is this JavaScript diff Checker free?

Yes, this service is free and we don't save any data unless you explicitly ask us to save.

What are other features of this JavaScript Comparator?

  • This tool can also beautify or format your JavaScript code. Right click on the pane you want to beautify/prettify & select Format Document or click Format button. This is very helpful when you are comparing code from websites that often minify JavaScript files.
  • This JavaScript diffing tool can show syntax highlighting for your comfort.
  • You can easily find all the occurances of particular string if you want to change them.


  • Privacy friendly: All text processing & comparison is done in your browser. Your data remains private.
  • Inline diff mode, word wraping, dark/high-contrast theme support.
  • Change statistics and line by line change navigator.
  • No installation. Works in all modern browsers.
  • Syntax highlighting & formatting for various programming languages.
  • 128-bit SSL/TLS encryption for uploaded/shared diffs.
  • Export diff as single PDF file in combined mode.