Module Not Found Error

Check if the package is listed in package.json and installed.

# Check if package is installed
npm ls package-name

# Install if missing
npm install package-name

# Install dev dependency
npm install --save-dev @types/package-name

Verify the path to the module is correct, especially for relative imports.

// ❌ Wrong relative path
import { helper } from "../utils/helper"
// File is at src/app/page.tsx, helper is at src/lib/helper.ts

// ✅ Correct path (relative to current file)
import { helper } from "../../lib/helper"

// ✅ Using path alias
import { helper } from "@/lib/helper"

Ensure tsconfig.json has the correct module resolution settings.

{
  "compilerOptions": {
    "moduleResolution": "bundler", // or "node" for older projects
    "baseUrl": ".",
    "paths": {
      "@/*": ["./src/*"]
    }
  }
}