You don't replace. jj is backed by git anyway.

gcr · 2026-04-14T12:52:02 1776171122

You can switch an existing git repo to jj by using:

jj git init --git-repo my-repo

I think (but CANNOT PROMISE) that just removing the .jj folder will bring you back, but definitely take a backup of .git before you try this in case I’m wrong.

Jenk · 2026-04-14T12:53:32 1776171212

No that is correct when in colocate mode (which is the default mode). Simply removing the .jj folder will "de-jj" the repo entirely, but will leave you in a headless state. Simple to fix with a `git switch` though.

If you are _not_ in colocate mode, the .git folder is located _inside_ the .jj folder. So worth checking!

ncphillips · 2026-04-14T15:58:51 1776182331

Okay but why would they use jj when they do trunk-based dev

Jenk · 2026-04-14T18:54:49 1776192889

I do trunk based dev. My colleagues prefer git. I still prefer to use jj.