Cursor AI Editor — AI-Powered Coding Guide

Cursor is an AI-first code editor built on VS Code that integrates large language models directly into the editing experience. It understands your entire codebase and can generate, edit, and explain code through natural language commands.

In this tutorial, you will learn how to use Cursor’s AI chat, inline editing, Composer for multi-file changes, and codebase awareness features. You will also configure .cursorrules for project-specific AI behavior and migrate your workflow from VS Code. DodaTech uses Cursor to accelerate development of Doda Browser features and DodaZIP utilities.

What You’ll Learn

By the end of this guide, you will be able to generate code from natural language descriptions, refactor across multiple files with Composer, configure Cursor’s AI to follow your project conventions, and maintain your existing VS Code extensions and settings.

Why Cursor Matters

AI-assisted coding is no longer experimental — it is a productivity multiplier. Developers using AI tools complete tasks 2-3x faster on average. Cursor’s deep integration means the AI understands your imports, types, function signatures, and project structure, producing contextually accurate code.

Cursor Learning Path

    flowchart LR
  A[Setup from VS Code] --> B[AI Chat]
  A --> C[Inline Editing]
  B --> D[Composer]
  C --> D
  D --> E[.cursorrules]
  E --> F{You Are Here}
  style F fill:#f90,color:#fff
  

Getting Started

Download Cursor from cursor.com. It is a fork of VS Code, so your settings, keybindings, and extensions carry over automatically.

Migrating from VS Code

Cursor adds a new icon bar on the left with AI-specific features: Chat, Composer, and AI terminal.

AI Chat

Press Cmd+I (macOS) or Ctrl+I (Windows/Linux) to open the AI chat panel. You can ask questions about your codebase:

Question: "How does the authentication middleware work in this project?"

The AI searches your project files, reads the relevant code, and explains it in context:

Answer: The auth middleware is in src/middleware/auth.js. It checks for a JWT token
in the Authorization header, verifies it using jsonwebtoken, and sets req.user.
If the token is missing or invalid, it returns 401.

Chat with Selection

Select code and press Cmd+L to ask questions about the selected code:

Selected: a React useEffect hook
Question: "Add cleanup logic to prevent memory leaks"

Inline Editing

Highlight any code block and press Cmd+K to edit it inline. Describe the change in natural language.

// Selected code
function processItems(items) {
  let result = [];
  for (let i = 0; i < items.length; i++) {
    if (items[i].active) {
      result.push(items[i]);
    }
  }
  return result;
}

Prompt: “Rewrite using filter and map, add types”

Result

interface Item {
  id: number;
  active: boolean;
  name: string;
}

function processItems(items: Item[]): Item[] {
  return items.filter((item) => item.active);
}

Expected output is the same filtered list but with type safety and idiomatic TypeScript.

Composer

Composer (Cmd+Shift+I) handles multi-file changes. Describe a feature, and Cursor creates or modifies multiple files:

Prompt: "Create a Todo API with Express, TypeScript, and an in-memory store.
Include GET /todos, POST /todos, PATCH /todos/:id, DELETE /todos/:id"

Composer generates:

// src/types.ts
export interface Todo {
  id: string;
  title: string;
  completed: boolean;
  createdAt: Date;
}

// src/store.ts
export class TodoStore {
  private todos: Map<string, Todo> = new Map();

  getAll(): Todo[] {
    return Array.from(this.todos.values());
  }
  getById(id: string): Todo | undefined {
    return this.todos.get(id);
  }
  create(title: string): Todo { /* ... */ }
  update(id: string, data: Partial<Todo>): Todo | undefined { /* ... */ }
  delete(id: string): boolean { /* ... */ }
}

// src/routes.ts
import { Router, Request, Response } from 'express';
import { TodoStore } from './store';

const router = Router();
const store = new TodoStore();

router.get('/todos', (_req: Request, res: Response) => {
  res.json(store.getAll());
});

router.post('/todos', (req: Request, res: Response) => {
  const todo = store.create(req.body.title);
  res.status(201).json(todo);
});
// ... PATCH, DELETE routes

Expected output

curl http://localhost:3000/todos
# → []

curl -X POST http://localhost:3000/todos -H "Content-Type: application/json" -d '{"title":"Test"}'
# → {"id":"abc123","title":"Test","completed":false,"createdAt":"..."}

curl http://localhost:3000/todos
# → [{"id":"abc123","title":"Test","completed":false,"createdAt":"..."}]

Codebase Awareness

Cursor indexes your project and understands relationships between files. It knows:

• Which functions are imported from where
• How components are composed
• What types are defined and used
• The project’s dependency graph

This means AI suggestions are not generic — they use your actual variable names, types, and function signatures.

.cursorrules

The .cursorrules file in your project root tells Cursor how to behave for that specific project:

You are an expert TypeScript and React developer.
- Always use TypeScript strict mode
- Prefer functional components with hooks
- Use Tailwind CSS for styling, not inline styles
- Import paths should use @/ alias
- Write unit tests for every new function
- Use async/await over raw promises

Place .cursorrules in the root of your project. The AI reads it on every interaction, ensuring consistent responses.

VS Code vs Cursor

Common Errors

1. AI Generating Outdated APIs

Cursor’s AI may suggest deprecated APIs. Add a .cursorrules line: “Use modern ES2023+ syntax. Preduce Array.prototype.toSorted() over .sort().”

2. Composer Creating Duplicate Files

Composer sometimes creates new files when existing ones should be modified. Review the diff before accepting. Use “Accept all” cautiously — check each file individually.

3. Extension Not Loading

All VS Code extensions work, but some may need a fresh install on Cursor’s marketplace. Check the Extensions panel for any disabled items.

4. Settings Not Synced

Cursor uses a separate config directory (~/.config/Cursor/User/). Copy your VS Code settings.json there, or use the Settings Sync feature built into Cursor (same GitHub account).

5. AI Hallucinates Import Paths

The AI may suggest imports that do not exist. Verify the path and file name. Press Ctrl+Click on the import to jump to the file.

6. Large Context Limitations

Cursor’s context window is limited. For very large refactors, break the task into steps and provide focused prompts.

7. .cursorrules Not Took Effect

The AI reads .cursorrules at the start of each session. If changes are not reflected, restart Cursor or open a new chat.

Practice Questions

1. What keyboard shortcut opens inline editing in Cursor?

Cmd+K (macOS) or Ctrl+K (Windows/Linux) with code selected.

2. What is the difference between Chat and Composer?

Chat (Cmd+I) answers questions and explains code. Composer (Cmd+Shift+I) makes multi-file changes based on feature descriptions.

3. How do you configure Cursor’s AI behavior per project?

Create a .cursorrules file in the project root with instructions for the AI model.

4. Can you use VS Code extensions in Cursor?

Yes — Cursor is a VS Code fork and supports the entire VS Code extension marketplace.

5. Challenge: Create an API with Composer

Prompt Composer: “Create a URL shortener API with Express and TypeScript. Include generateShortCode, store in memory, and redirect endpoint.” Review the generated files and test with curl.

Mini Project: AI-Assisted Code Generation

Build a simple CLI tool using Cursor’s Composer:

1. Create a new directory and open it in Cursor
2. Create a .cursorrules file:

You are a Node.js CLI expert.
- Use ESM imports (import/export)
- Use commander for CLI parsing
- Use chalk for colored output
- Include proper error handling

3. Prompt Composer: “Create a file-watching CLI tool that monitors a directory for changes and logs file events (add, modify, delete) with timestamps.”
4. Accept the generated files, run npm install, and test the CLI:

node index.js watch ./test-dir
# Expected: Watching ./test-dir for changes...
# Create a file: [2026-06-07T10:00:00] CREATED: test-dir/hello.txt

This workflow shows how DodaTech engineers use Cursor to rapidly prototype features for Doda Browser and DodaZIP before refining them manually.

FAQ

Built by the developers of Doda Browser, DodaZIP, and Durga Antivirus Pro.