Automatically find the commit that introduced a bug git Code Snippet in 2025

Uses a binary search algorithm and a given script to find which commit in history introduced a bug.

• Use git bisect start to start the process.
• Use git bisect good <commit> to mark a <commit> as "good", indicating it is known to be bug-free.
• Use git bisect bad <commit> to mark a different <commit> as "bad" indicating it has the bug.
• Use git bisect run <command> to run the given <command> on each subsequent commit to find which commit introduce the bug.
• Use git bisect reset to reset to the original branch. You can optionally specify a <commit> to reset to.

git bisect start
git bisect good <commit>
git bisect bad <commit>
git bisect run <command>
git bisect reset [<commit>]

git bisect start
git bisect good 3050fc0de
git bisect bad c191f90c7
git bisect run npm test # Run `npm test` for each commit
# ... some time later the bad commit will be printed
git bisect reset # Goes to the original branch