how to use .env in javascript

To use .env in JavaScript, you can use dotenv package which loads environment variables from a .env file into process.env. Here's how you can use it:

1. Install dotenv package using npm.

npm install dotenv
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2. Create a .env file in the root directory of your project and add environment variables with key-value pairs. For example:

DB_HOST=localhost
DB_USER=root
DB_PASSWORD=secret
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3. Require and configure dotenv at the beginning of your JavaScript file.

index.tsx
require('dotenv').config()
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4. Access environment variables using process.env.

index.tsx
const dbConfig = {
  host: process.env.DB_HOST,
  user: process.env.DB_USER,
  password: process.env.DB_PASSWORD
};

console.log(dbConfig);
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This will output:

index.tsx
{
  host: 'localhost',
  user: 'root',
  password: 'secret'
}
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Make sure to add .env to .gitignore file to keep your sensitive data out of version control.