using variable inside of env in React

Question

I have an env file with such format:

REACT_APP_API_URL_API_LOGIN =  "http://x.x.x.x:1000/api/loginuser"
REACT_APP_API_URL_API_SIGNUP= "http://x.x.x.x:1000/reg/CheckRegister"
REACT_APP_API_URL_API_FETCH_IMAGE = "http://x.x.x.x:1000/api/userImage"
REACT_APP_API_URL_API_VERIFY_USER = "http://x.x.x.x:1000/reg/RegisterUser"

as you know for privacy reasons I changed IP:PORT

I want to separate my base url, the x.x.x.x:1000 part. because sometimes I need to change it for testing purposes.

I wish to have such thing:

REACT_APP_API_URL_API_BASE = x.x.x.x:1000
REACT_APP_API_URL_API_LOGIN =  "http://REACT_APP_API_URL_API_BASE/api/loginuser"

I thought about having 2 different .env files or defining a constant inside of React but it will make, editing codes harder. since I must search for my all,fetching functions all the time.

how can I use my base url inside of the same .evn file.

@Konrad that means there's no way except creating another .env file isn't it? — yasxcv
– yasxcv, Commented Nov 21, 2022 at 9:44

Sachila Ranawaka · Accepted Answer · 2022-11-21 09:45:31Z

1

in react .env file, you can use it like this

REACT_APP_API_URL_API_BASE = x.x.x.x:1000 
REACT_APP_API_URL_API_LOGIN =  http://$REACT_APP_API_URL_API_BASE/api/loginuser

answered Nov 21, 2022 at 9:45

Sachila Ranawaka

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5 Comments

yasxcv Over a year ago

it gives me CORS error

Sachila Ranawaka Over a year ago

that you need to enable from the backend

yasxcv Over a year ago

how can I do this? actually I only do front end but backend works with .Net Core.

Sachila Ranawaka Over a year ago

backend needs to allow your host x.x.x.x:1000 to access their services. This needs to handle from the .net side

yasxcv Over a year ago

oh, you mean CORS problem. we don't have this problem. cross origin error only happens when I use this snippet. by manually typing it is working.

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