How to use nodejs egg

Node.js Egg is a Node.js Web framework based on Koa.js. It is an open source Web development framework from Alibaba that can help developers build Web applications quickly and efficiently. This article will share the technical details and usage related to Node.js Egg.

1. Introduction to Node.js Egg

1. Why use Node.js Egg

Node.js Egg is an enterprise-level application framework based on Koa.js. Provides scalability, reliability and flexibility. It uses the modular idea to allow users to quickly develop, test and deploy. It can also have multiple plugins, so we can choose to install or uninstall them according to our needs. These plugins include ORM, Redis, queues, logs, and more, making it capable of meeting the needs of most web applications.

2. Features of Node.js Egg

Node.js Egg framework has the following features:

(1) Convention is better than configuration: some default values ​​and conventions The directory structure avoids excessive configuration files and duplicate content.

(2) Scalability: Provides a rich plug-in mechanism that allows users to quickly customize their applications.

(3) Useful plug-ins: Provides many useful plug-ins, such as ORM, Redis, queue, log, Session, etc.

(4) Easy to test and deploy: The framework is modular and can reserve interfaces, making testing and user customization easier.

(5) Security: Provides some default policies to ensure application security, such as CSRF prevention, XSS prevention, etc.

3. The architecture of Node.js Egg

The architecture of Node.js Egg is shown in the figure below (quoted from the official website):

Node.js Egg is mainly composed of the following parts:

(1) Application: The application is the outermost container of the framework. The application can be regarded as a large collection. The collection stores some is the most important thing about this application.

(2) Plug-in: Plug-in is the extension mechanism of Node.js Egg, which allows users to easily add some functions.

(3) Framework: The framework contains the basic modules of Node.js Egg, such as controllers, services, middleware, configuration, etc.

(4) Framework outline: The framework outline subdivides the framework and plug-ins into smaller, combinable parts, allowing plug-ins to be independent and cooperative with each other.

2. Rapid Development of Node.js Egg Application

Node.js Egg application can be built very quickly. Let’s take a look at the specific steps:

1. Install Node.js and npm

Node.js Egg is built using the Node.js framework, so you need to install the Node.js environment first. You can download the corresponding version of the Node.js environment from the Node.js official website. Open a terminal command line window and enter the following command to check whether the Node.js version is available:

$ node -v

If Node.js has been installed correctly, it will return a version number corresponding to the version you installed.

2. Install Node.js Egg

Before installing Node.js Egg, make sure that the Node.js environment has been installed. Open a terminal command line window, and then enter the following command at the command prompt to install Node.js Egg globally:

$ npm install egg-init -g

This installs the Node.js Egg scaffolding program into the global environment.

3. Create an empty application

Enter the development directory and run the following command:

$ egg-init myapp --type=simple
$ cd myapp # 进入项目
$ npm i # 安装依赖

Running the npm i command will install all dependencies in the myapp application, including Node.js Egg itself.

4. Run the application

Start the application in the terminal. Run in the myapp directory:

$ npm run dev

Now that the application is running on the local server, you can access the application by opening the browser and entering http://localhost:7001/.

At this point, we have completed the development of the Node.js Egg application.

3. Node.js Egg plug-ins

Node.js Egg provides many plug-ins. These plug-ins can make program development faster, smarter and more convenient. Let’s introduce Node first. Several commonly used plug-ins for .js Egg:

1. egg-validate plug-in

The egg-validate plug-in provides a simple and powerful mechanism for validating HTTP requests and responses. The egg-validate plug-in supports various verification methods, such as required, type, range, etc.

2. egg-sequelize plug-in

The egg-sequelize plug-in is a lightweight ORM framework for operating databases. It provides various database operation methods, such as adding, deleting, updating, querying, etc. It has built-in support for MySQL, PostgreSQL, SQLite, MSSQL and other databases.

3. egg-redis plug-in

The egg-redis plug-in is a Redis client. It provides you with various methods to operate Redis, such as set, get, incr, etc. Very convenient.

The above are just a few common plug-ins for Node.js Egg. If you want to know more, you can go to the Node.js Egg official website to find them.

4. Conclusion

This article introduces some concepts, features and usage of Node.js Egg, including Node.js Egg architecture, rapid application development and Node.js Egg plug-ins . If you're looking for a quick way to build web applications, Node.js Egg is the way to go.

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