reactjs - Create React App: using environment variables in index.html

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reactjs - Create React App: using environment variables in index.html

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

reactjs - Create React App: using environment variables in index.html

Is there a way to inject environment variables, e.g. REACT_APP_MY_API into the index.html file?

According to this, it can be done, but I can't seem to get it to work.

.env

REACT_APP_MY_API=https://something.com

index.html

<script type="text/javascript">
  console.log("%REACT_APP_MY_API%") // undefined 
  console.log("%NODE_ENV%") // development
</script>

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1 Answer

深蓝 · Answer 1 · 2021-10-23T18:37:20+0000

I just tried with an (almost) new CRA setup and it works.

<head>
  <title>React App</title>
  <script type="text/javascript">
   console.log("%REACT_APP_TEST%") // OK
   console.log("%NODE_ENV%") // development
  </script>
</head>

Did you try restarting the server? I just tried changing the test variable with your example and it works if you restart the development server.

As someone pointed out in the comments, the official documentation of CRA has a section about that.

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reactjs - Create React App: using environment variables in index.html

reactjs - Create React App: using environment variables in index.html

.env

index.html

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