How to set React app variables in NPM start script

Question

so the npm start in my package.json looks like this

"start": "REACT_APP_Environment=development react-scripts start",

This worked fine for previous developers on the project, possibly because they were on MacOS, that's not the case for me on windows, when I run I get

> REACT_APP_Environment=development react-scripts start

'REACT_APP_Environment' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] start: `REACT_APP_Environment=development react-scripts start`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Omar\AppData\Roaming\npm-cache\_logs\2019-09-22T15_12_59_217Z-debug.log

I can fix this by removing the environment variable from the start script and running by the command set "REACT_APP_Environment=development" && npm start, but this is not convenient, how can I have it all included and work properly on windows in my start script? thanks

Take a look at npmjs.com/package/cross-env

Cynigo
– Cynigo

2019-09-22 15:28:46 +00:00
Commented Sep 22, 2019 at 15:28 — Cynigo
– Cynigo, Commented Sep 22, 2019 at 15:28

jonyB · Accepted Answer · 2019-09-22 15:34:23Z

2

I would recommend checking out .env, seems like it might solve your problem

npmjs.com/package/dotenv

answered Sep 22, 2019 at 15:34

jonyB

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2 Comments

Omar Hussein Over a year ago

Thank you, however I would rather not add more packages, is it possible to ammend the start script somehow?

jonyB Over a year ago

If you'd like you can write a basic script that does the same thing that .env does. But really, dotenv has no dependencies, it's super basic and really convenient so you're only adding this one small package and it's wonderful

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