There are a few ways to use environment variables in Deno:
The Deno runtime offers built-in support for environment variables with
Deno.env
.
Deno.env
has getter and setter methods. Here is example usage:
Deno.env.set("FIREBASE_API_KEY", "examplekey123");
Deno.env.set("FIREBASE_AUTH_DOMAIN", "firebasedomain.com");
console.log(Deno.env.get("FIREBASE_API_KEY")); // examplekey123
console.log(Deno.env.get("FIREBASE_AUTH_DOMAIN")); // firebasedomain.com
console.log(Deno.env.has("FIREBASE_AUTH_DOMAIN")); // true
You can also put environment variables in a .env
file and retrieve them using
dotenv
in the standard library.
Let's say you have an .env
file that looks like this:
PASSWORD=Geheimnis
To access the environment variables in the .env
file, import the load
function from the standard library. Then, import the configuration using it.
import { load } from "https://deno.land/std/dotenv/mod.ts";
const env = await load();
const password = env["PASSWORD"];
console.log(password);
// "Geheimnis"
The Deno standard library has a
std/flags
module for
parsing command line arguments.