std:dotenv

Load environment variables from .env files.

Import

import { Dotenv } from "std:dotenv";

Functions

config(path: String = ".env"): Void

Reads KEY=value lines from a file and sets them in the process environment. Read the values with Process.env from std:process.

• Empty lines and lines starting with # are skipped.
• Spaces around the key and the value are trimmed. Quotes are kept as part of the value.
• Existing variables with the same name are overwritten.
• If the file does not exist, nothing happens and no error is raised.

import { Dotenv } from "std:dotenv";

Dotenv.config();  // Loads from .env

// Or specify a path
Dotenv.config(".env.production");

File Format:

# Comments start with #
DATABASE_URL=postgres://localhost/mydb
API_KEY=secret-key-123
DEBUG=true

Usage:

import { Dotenv } from "std:dotenv";
import { Process } from "std:process";
import { File } from "std:io";

File.write(".env", "DATABASE_URL=postgres://localhost/mydb\nAPI_KEY=secret-key-123\n");
Dotenv.config();

let dbUrl = Process.env("DATABASE_URL");
let apiKey = Process.env("API_KEY");
print(dbUrl);  // postgres://localhost/mydb
File.delete(".env");

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