git amend last commit message — rewrite without a new commit

Quick Answer

# Rewrite the last commit message
git commit --amend -m "fix: correct the login redirect URL"

# Open your editor to amend instead of inline
git commit --amend

When to use this

You just committed and noticed a typo in the message, or want to add more detail before pushing.

Other causes & fixes

Add a forgotten file to the last commit

git add forgotten-file.ts
git commit --amend --no-edit     # keeps the existing message

Amend a commit that was already pushed

Avoid amending pushed commits on shared branches. If you must, force-push — but only if you are the sole user of the branch.

git commit --amend -m "corrected message"
git push --force-with-lease origin my-branch