I am coding a website with Next.js and I tried to add google Tag Manager.
I followed the tutorial on the Next.js Github example but for some reasons I can't access to my environment variables.
It says my variable is undefined.
I created a file .env.local on my project folder (at the same level as components, node_modules, pages, etc)
In this file I created a variable like this (test purpose) :
NEXT_PUBLIC_DB_HOST=localhost
And on my index page I tried this code :
console.log("test ", process.env.NEXT_PUBLIC_DB_HOST);
But in my console I get a "test undefined".
I tried to put my variable into an .env file instead, without success.
What I am doing wrong ?
Restarting the server worked for me.
npm run dev> klout@0.1.0 dev
> next dev
Loaded env from [path]/.env.local
This envs just works in Server Side. To access this envs in Client Side, you need declare in the next.config.js
This way:
module.exports = {
reactStrictMode: true,
env: {
BASE_URL: process.env.BASE_URL,
}
}
After spending countless hours on this, I found that there is a tiny little paragraph in both the pre and post nextjs 9.4 documentation:
Next.js will replace process.env.customKey with 'my-value' at build time.
In order to keep server-only secrets safe, Next.js replaces process.env.* with the correct values at build time.
Key words being BUILD TIME. This means you must have set these variables when running next build and not (just) at next start to be available for the client side to access these variables.
Create .env (all environments), .env.development (development environment), and .env.production (production environment).
Add the prefix NEXT_PUBLIC to all of your environment variables.
NEXT_PUBLIC_API_URL=http://localhost:3000/
process.env.NEXT_PUBLIC_API_URL
npm run dev
For those using NextJS +9 and looking for environment variables in the browser, you should use the NEXT_PUBLIC_ prefix. Example:
NEXT_PUBLIC_ANALYTICS_ID=123456789
This is my next.config.js file.
/** @type {import('next').NextConfig} */
const nextConfig = {
reactStrictMode: true,
env: {
BASE_URL: process.env.NEXT_PUBLIC_SITE_URL,
},
};
module.exports = nextConfig;
Restart the server and it worked fine. using Nextjs 12.1.0 with typescript
In my case, Im pasting REACT_APP_API_URL instead of NEXT_PUBLIC_API_URL.