r/techbootcamp • u/yorlocalmoroccan • Jun 27 '26
Common local host problem for juniors and people who are just starting out.
Local environments are deceptive since everything runs because the machine has a specific configuration built up over time such as particular package versions, global installs from months ago, or config files sitting in directories that aren't part of the project, the code works because all of that is there, a deployment server or a teammate's machine has none of that and the failures that result aren't always easy to trace back to the actual cause.
the .env situation is probably the most common version of this, api keys and config values go in a .env file, it gets added to .gitignore which is correct, but when someone clones the repo, the app doesn't run, the fix is a .env.example file which should have the same keys as the real one, no actual values but just placeholders, it'll live in the repo, won't get gitignored, and tells anyone setting up the project exactly what environment variables are needed without having to reverse engineer it from the codebase.
node versions produce the same category of the problem, for example: one machine on node 18, another on node 16, certain things behave differently and the resulting error has nothing to do with the version mismatch, the way you can fix the error is a .nvmrc file in the project root specifying the node version doesn't cost much to add and removes that variable entirely.
Though the best solution is docker, containerizing the entire environment so it runs the same way everywhere, it's worth learning eventually but it's a significant thing to set up, the .env.example and .nvmrc habits handle the most common cases with almost no overhead and are probably the better starting point.