How to make the site URL an external parameter to the application?

I read your Login react.js article & liked it. My issue is that I have the React app. Now I need to generate 3 versions, for developement, testing and production. They all differ only in the URL for the login.

How do I make the react app agnostic/ configurable at runtime and save the need for 3 versions??

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The answer is simple, use: // need to add either http or https before

In this way my app connects to the correct server at runtime.

I have a single distribution - works well.

Final note: for localhost and local server you may need to define the local server. Solved easy by looking for ‘localhost’ in the reply. Hope it helps.

Hi there,

What you could do is define your development and production URLs in your .env file:


Then you can access the environment variable in React with:

const configUrl = process.env.REACT_APP_CONFIG_URL

If you are getting started with React, I would recommend this free video course here:

Getting Started with React

Hope that this helps! Regards, Bobby