process.env.NODE_ENV === "开发" 即使在生产中

Question

I want to deploy a React app (made with Create React App) + a Node server with Heroku,

I did it, but my app can't fetch data from the server,

In production, my process.env.NODE_ENV is equal to "development" which causes a lot of wrong stuff in my code,

Do you know what can put process.env.NODE_ENV always at "development"? At the build, this environment variable is supposed to switch to "production", no?

Answer 1

Your package.json add this.

  "scripts": {
    "start": "export NODE_ENV=development; {your start code}",

Answer 2

Your env variables can be set per environment , in this case in Heroku: https://devcenter.heroku.com/articles/config-vars#using-the-heroku-dashboard

If you want to make sure build always runs with the same NODE_ENV , you can follow @seunggabi 's answer. I'd also use cross-env to make it work cross-platform in such case. Per-process variable can be forced on heroku-postbuild task (after && ).

Answer 3

You can take control of your Environment with env-cmd . They make easy to switch between your local development, testing, staging, UAT or production.

You can refer to this article . This is was very helpful for me