Securing Applications in Deno

Introduction

Deno is a modern runtime for JavaScript and TypeScript, emphasizing security. This lesson covers essential concepts for securing applications developed in Deno.

Key Security Concepts

1. Permission System

Deno operates with a secure permission system, requiring explicit permissions for file, network, and environment access.

2. Secure APIs

Deno provides a set of secure APIs that prevent access to potentially dangerous system resources.

3. TypeScript by Default

Deno uses TypeScript, which allows for static type checking, helping to catch errors at compile time.

Best Practices

Use the permission flags wisely when running Deno scripts.
Keep your dependencies updated to mitigate vulnerabilities.
Utilize Deno's built-in testing and linting tools for code quality.

Code Examples

Here are some code snippets demonstrating security features in Deno.


            // Example: Running a Deno script with permissions
            deno run --allow-net --allow-read my_script.ts


            // Example: Using Deno's fetch API securely
            const response = await fetch("https://api.example.com/data", {
                method: "GET",
                headers: {
                    "Authorization": "Bearer YOUR_TOKEN",
                },
            });
            const data = await response.json();
            console.log(data);

FAQ

What are Deno's security permissions?

Deno requires explicit permissions for file, network, and environment access, enhancing security by default.

How can I keep my Deno application secure?

Regularly update dependencies, use secure APIs, and run your scripts with the minimum required permissions.