JavaScript Diff & Compare
Paste two JavaScript snippets to see highlighted line-by-line differences, a change summary, and a similarity percentage. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
two versions of a JS function
Example Output
changed lines highlighted
How to Use
- 1Paste the first JavaScript snippets (A) in the left box and the second (B) in the right box.
- 2Adjust the options if needed (ignore case, whitespace, or empty lines).
- 3Click Compare (or press Ctrl+Enter).
- 4See the highlighted differences, a summary of how many changes there are, and the similarity percentage. Switch between side-by-side / unified / inline views.
About JavaScript Diff & Compare
JavaScript Diff & Compare shows the differences between two JavaScript snippets line by line, with added lines highlighted green and removed lines red. Ideal for reviewing changes before a commit or comparing two versions of a function.
The Git-style unified view can be copied as a patch, and the ignore-whitespace option helps you focus on logic changes rather than formatting.
FAQ
What is the difference between "diff" and "compare"?
Both are done by the same tool. "Diff" highlights the lines/parts that changed (added/removed), while "compare" shows how similar the two inputs are (similarity percentage + summary). You get both at once here.
Is my data sent to a server?
No. The entire comparison is computed in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.