You are using a non-standard "NODE_ENV" value in your environment - How to set the default value of NODE_ENV in windows

I changed the value of NODE_ENV to production using the command:

setx NODE_ENV production

Now in my nextjs project, anytime I run npm run dev or build, I get the error: You are using a non-standard "NODE_ENV" value in you environment.

After doing some research, I found out this property is automatically provided by Nextjs and the default value is NEXT_PUBLIC_APP_ENV (I may be wrong about this).

I've tried to change the value back to the default: using setx NODE_ENV NEXT_PUBLIC_APP_ENV which works. Here's the result of running node followed by process.env in my terminal to confirm the change.

The problem is I still get the error every time I run npm run build or dev and in any nextjs project on my PC. I'm I missing something or is there another place this property is being added? Please help.

Turns out it was stored in my computer's environment variable. If you're on windows 7/10/11, here's the solution to fix this.

Hold down Win + R to open the run box and enter sysdm.cpl to open your system properties.

Next, navigate to the advanced tab and click Environment variables at the bottom.

You should see a list of all the env variables stored on your PC. Among the list should be the variable for NODE_ENV. Simply delete it and click okay to set it to default.

Note: You may need to restart your terminal to see the changes.