Deno is a modern runtime for JavaScript and TypeScript that makes web development easier and more secure. If you’re new to Deno, this guide will walk you through the basics step by step.
1. Installing Deno
Before you can start using Deno, you need to install it. Here’s how:
- For macOS:
Open your terminal and run:
brew install deno - For Windows:
Open PowerShell and run:
iwr https://deno.land/x/install/install.ps1 -useb | iex - For Linux:
In your terminal, type:
curl -fsSL https://deno.land/x/install/install.sh | sh
2. Verify Installation
Once installed, make sure it’s working by typing:
deno --version
You should see the version number of Deno displayed.
3. Running Your First Script
Let’s create a simple script. Open your favorite text editor and make a file called hello.ts with the following code:
console.log("Hello, Deno!");
Now, run the script in your terminal with:
deno run hello.ts
You should see “Hello, Deno!” printed in your terminal!
4. Importing Modules
Deno makes it easy to use third-party libraries. You can import them directly from URLs. For example, let’s create a simple server:
import { serve } from "https://deno.land/std/http/server.ts";
const server = serve({ port: 8000 });
console.log("Server running on http://localhost:8000");
for await (const request of server) {
request.respond({ body: "Hello from Deno!\n" });
}
Run it with:
deno run --allow-net server.ts
The --allow-net flag gives your script permission to use the network.
5. Understanding Permissions
Deno is designed with security in mind. By default, your scripts don’t have access to files, the network, or the environment. You must give explicit permissions using flags like --allow-read, --allow-write, or --allow-net when running your scripts.
6. Built-in Tools
Deno comes with useful tools to help you write better code:
- Formatting: To format your code neatly, run:
deno fmt - Linting: To check your code for common errors, use:
deno lint - Testing: If you want to run tests, just type:
deno test
7. Deploying with Deno Deploy
If you want to deploy your Deno application, check out Deno Deploy. It’s a serverless platform that lets you run your Deno code in the cloud. Sign up for an account on the Deno Deploy website, and follow the instructions to get started.
Conclusion
Deno is a powerful tool that makes developing applications simpler and safer. With its straightforward installation, easy module importing, and built-in tools, it’s a great choice for both beginners and experienced developers. Explore more about Deno in the official documentation as you continue your journey! That’s it <3