GitHub Copilot

Set Up Project Structure

Create the project folder and install the necessary dependencies.

Initialize a Node.js project, install Express, JWT, bcrypt. Create the folders: /routes, /controllers, /models, /middleware.

Start with a comment describing the API structure so Copilot can suggest initial setup code.

Define User Model

Create a user schema with password hashing based on Copilot's suggestions.

Write a comment: "// User model with email, password (hashed), name, timestamps" then let Copilot generate the model code.

Carefully review the generated code, especially the functions related to security like password hashing.

Implement Authentication Routes

Build the register and login endpoints along with JWT token generation.

Comment: "// POST /auth/register - create a new user with a hashed password" and "// POST /auth/login - authenticate user and return JWT"

Copilot will suggest the entire route handler; adjust the token expiry and secret management as needed.

Create Authentication Middleware

Build middleware to protect routes that require authentication.

Comment: "// Middleware to check JWT token and attach user to request" then accept Copilot's suggestions.

Add appropriate error handling for expired tokens and invalid signatures.

Build Protected API Endpoints

Create business logic endpoints that use authentication middleware.

Comment describing the purpose of the endpoint (e.g., "// GET /api/profile - return the current user's information") and let Copilot generate implementation code.

Use clear comments before each endpoint to help Copilot suggest more accurate code.

Add Error Handling

Implement comprehensive error handling and validation.

Comment: "// Global error handling middleware" and "// Input validation for user registration"

Copilot is very good at generating try-catch blocks and schema validation when asked clearly.