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Javascript – Difference between Express and Nest JS

I want to start working with NestJs. But the first question comes into mind that what problem resolve NestJS. I know NestJs is framework and express is library when i search article to find the difference between Nest and Express the answer which met is
1=>Code Reusability
2=>Performance
etc.
But code reusability in express we can do.So i want to know from experts what exactly the difference between Nest and Express.

I search on google to find the difference between ExpressJs And NestJs but these points are not satisfy me. I want to learn from stack overflow experienced people tell and explain the difference.

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2

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  1. 0

    Express is a minimalist web framework for Node.js, offering flexibility but requiring manual structuring for large projects. NestJS, built on top of Express, provides a structured and opinionated framework with built-in support for TypeScript, dependency injection, and modular architecture, promoting code scalability and maintainability. Unlike Express, NestJS encourages a more organized approach to development through its architectural patterns like MVC and its reliance on decorators. While both offer code reusability, NestJS streamlines development through its powerful features and conventions, making it a preferred choice for complex applications requiring scalability and maintainability.

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  2. 0

    Express.js and NestJS are both web frameworks for Node.js, but they differ in various aspects including their architectural styles, features, and conventions. Here’s a comparison between Express.js and NestJS:

    1. Architectural Style:

      • Express.js: It’s a minimalist and unopinionated framework, providing a simple and flexible structure for building web applications. Developers have a lot of freedom to structure their application code and choose libraries according to their preferences.
      • NestJS: It’s a TypeScript-based framework that is heavily inspired by Angular. NestJS advocates for a modular and structured approach to building applications. It encourages the use of dependency injection, decorators, and other features commonly found in object-oriented programming languages.

    2. Dependency Injection:

      • Express.js: It doesn’t have built-in support for dependency injection. Developers often use third-party libraries like InversifyJS or Awilix for managing dependencies.
      • NestJS: It has built-in support for dependency injection. NestJS uses TypeScript decorators to declare dependencies, making it easier to manage and test application components.

    3. Decorators and Metadata:

      • Express.js: It doesn’t utilize decorators or metadata for defining routes and controllers. Developers typically use plain JavaScript/TypeScript functions to define routes.
      • NestJS: It heavily relies on decorators and metadata for defining controllers, routes, middleware, and other application components. Decorators are used to annotate classes and methods, providing a declarative way to define the structure of the application.

    4. Middleware:

      • Express.js: Middleware functions are integral to the request-response cycle in Express.js. Developers can create custom middleware functions to handle various aspects of the request processing pipeline.
      • NestJS: NestJS also supports middleware, but it provides a more structured approach using middleware classes and method decorators. Middleware can be applied globally, per module, or per route.

    5. Built-in Features:

      • Express.js: It’s a lightweight framework, providing the basic building blocks for web applications. Developers often rely on third-party middleware and libraries for adding features like authentication, validation, and ORM integration.
      • NestJS: It comes with built-in features such as modules, controllers, providers (services), middleware, exception handling, validation, GraphQL integration, and more. NestJS aims to provide a comprehensive solution for building scalable and maintainable applications.

    6. Community and Ecosystem:

      • Express.js: It has a large and mature ecosystem with a wide range of third-party middleware, libraries, and plugins available. There’s a vast community of developers contributing to the ecosystem.
      • NestJS: It’s relatively newer compared to Express.js but has been gaining popularity rapidly. NestJS has its ecosystem of modules, plugins, and libraries, and its community is growing steadily.

    In summary, Express.js is a lightweight and flexible framework that offers simplicity and freedom in building web applications, while NestJS provides a structured and opinionated approach, leveraging TypeScript features and Angular-inspired concepts to build scalable and maintainable applications. The choice between Express.js and NestJS depends on factors such as project requirements, developer preferences, and familiarity with TypeScript and Angular concepts.

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