If your project runs well in the Replit workspace and starts reporting missing environment variables, empty API keys, and non-existent database addresses as soon as it is released, this kind of problem is usually not that the code is broken when the environment is changed, but that the deployment environment does not automatically inherit everything in the workspace the way you want.
The most important tip in the current Replit documentation is that the production secrets and environment variables in the Deployments panel should be checked first when publishing issues. Many people only confirm that the program can run in Workspace, and the default release environment will also have the same value, only to find that the production environment is not available at all after going live.
This pit is particularly prone to two situations. First, you have temporarily set environment variables in the workspace shell or some debugging process, but not in the official Secrets. Second, someone on your team can see the values in their workspace, but the deployment target doesn't have these configurations, creating the illusion that "I'm fine here, but not online".
It is recommended to arrange it like this:
1. List all the environment variables that the program must rely on to run.
2. Check the Secrets and Deployments configurations one by one, not just to see if the workspace exists.
3. After deployment, use logs or output to confirm which values are read in the current environment.
4. If the logic needs to distinguish between development and production, then explicitly use environmental variables such as REPLIT_DEPLOYMENT for conditional diversion.
Replit has also recently moved towards "deploying Secrets to better sync with workspace secrets", but that doesn't mean you can skip checking at all. In particular, old projects, migrated projects, and multi-person collaboration projects are most likely to have a semi-synchronous state of "one side has value and the other side does not".
Therefore, it can run in the workspace, but there is a lack of environment variables after release, so don't blame the framework compatibility first. Checking the Secrets and Deployment environments separately is usually faster than continuing to change the code.
