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# Non-Standard NODE_ENV
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#### Why This Error Occurred
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Your environment has a non-standard `NODE_ENV` value configured.
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This may be by accident, so if you're unaware where the value is coming from, check the following:
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- The `.env*` files in your project, if present
- Your `~/.bash_profile` , if present
- Your `~/.zshrc` , if present
The greater React ecosystem treats `NODE_ENV` as a convention, only permitting three (3) values:
- `production` : When your application is built with `next build`
- `development` : When your application is ran with `next dev`
- `test` : When your application is being tested (e.g. `jest` )
Setting a non-standard `NODE_ENV` value may cause dependencies to behave unexpectedly, or worse, **break dead code elimination** .
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#### Possible Ways to Fix It
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To fix this error, identify the source of the erroneous `NODE_ENV` value and get rid of it: Next.js automatically sets the correct value for you.
If you need the concept of different environments in your application, e.g. `staging` , you should use a different environment variable name like `APP_ENV` .
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### Useful Links
- [Environment Variables ](https://en.wikipedia.org/wiki/Environment_variable )