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next.js/errors/env-key-not-allowed.md
Connor Davis 1e5d0908d0 Block Certain Env Keys That Are Used Internally (#6260) 
Closes: #6244 

This will block the following keys:
```
NODE_.+
__.+
```

There doesn't seem to be a way to simulate a failed build or else I'd add tests for it.
2019-02-15 17:49:40 +01:00

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The key "" under "env" in next.config.js is not allowed.

Why This Error Occurred

Next.js configures internal variables for replacement itself. These start with __ or NODE_, for this reason they are not allowed as values for env in next.config.js

Possible Ways to Fix It

Rename the specified key so that it does not start with __ or NODE_.