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This article mainly explains "Node.js development example analysis". The explanation content in this article is simple and clear, easy to learn and understand. Please follow the idea of Xiaobian and go deep into it slowly to study and learn "Node.js development example analysis" together!

1. Hierarchical organization code

For example, Express.js is a widely used Node.js framework that allows developers to customize callback functions that execute when requested by the client. With this flexibility, developers can easily analyze various business logic in callback functions.

However, if you start with callbacks, before you really understand the principles of callbacks, you'll find that as development progresses, the number of callbacks you need to write increases dramatically, making your routing file a cumbersome and confusing piece of code. The worst case scenario is code that is poorly readable, difficult to maintain and manage, and difficult to write unit test cases.

To avoid this situation, it is best to practice the programming principle of separation of concerns. This means that in application development you have to write different modules to route to your different businesses.

For back-end application development, different client requests are handled through different modules or layers.

So we can divide the code into three layers to handle these things:

Controller: This is the code module that defines API routing. In the routing processing function, the request object can be parsed, the necessary request parameters can be obtained, and then the service layer can be processed.

Sevice layer: Consists of many classes and methods that have a single responsibility while ensuring availability. The definition service layer effectively decouples business logic processing from routing definition.

Data access layer: It is mainly responsible for accessing, writing and updating the database. All SQL statements, database connections, models, ORMs, etc. should be defined here.

This three-tier code design provides a solid scaffolding for most Node. js-based application development, making our applications easier to code, maintain, debug, and test.

2. Use code compression

As a lossless file compression format, Gzip is mainly used to compress files for faster network transmission. It has a clear advantage in compressing code for Web applications developed on Node.js. Did you know that Express.js can easily compress code in Gzip format? That's right, it's using compression middleware.

In addition, the Express.js documentation recommends the following code to improve the performance of your app.

These settings compress the response body returned by the backend service and reduce latency to improve page responsiveness.

When optimizing server-side performance, front-end code optimization is also critical. You need to know the size of the page before the frontend code goes live. Don't forget to use tools like HTMLMinifier, CSSNano and UglifyJS to compress front-end HTML, CSS, JavaScript code before going live.

In summary, compressing and streamlining front-end code using Gzip is one of the best practices in Node.js development.

3. Learn to use third-party solutions

There is no doubt that Node.js has a large global development community. Package managers around NPM or Node already have a lot of feature-rich, well-maintained, well-documented frameworks, libraries, and tools for various use cases. As a result, developers can easily use these existing solutions in their projects and take advantage of these APIs.

It is strongly recommended that you look for existing solutions to deal with the problems encountered, which will make your development work easier. Here are some popular Node.js libraries that can improve the quality of your code:

Gulp: An automated task builder.

Agenda: A lightweight task scheduler library.

Moment: A tool library for parsing, checking, manipulating, and displaying dates and times.

Winston: A logging framework.

Nodemon: A tool that listens for file changes and automatically restarts services.

The libraries and tools above make it easier for developers to tackle a variety of problems. However, it is critical that you be aware of and accountable for each package imported into your project. In addition, you should know what the purpose of each package imported is, what its advantages are, and what its disadvantages and problems are. Finally, as a developer, you want to make sure you don't rely too much on these third-party libraries.

4. Take full advantage of program monitoring tools

APM tools are responsible for monitoring application performance and availability by discovering bottlenecks and fixing bugs. The Node.js monitoring tool can fix bugs by analyzing each Web result, pointing out problems and tracking issues.

One of the main purposes of using APM tools is to evaluate performance metrics, quality issues, performance bottlenecks, standard errors, etc., and use this information to make required code modifications and improvements.

ScoutAPM is an APM tool that helps developers analyze and optimize web application performance. It also provides real-time monitoring to help developers quickly locate problems and make changes to solve them before they are finalized.

This APM tool is the only application performance monitoring product that overcomes issues such as improving performance and stability. Among them, N+1 database query, database slow query and performance exception are the most common problems.

5. Keep your code clean and easy to reuse Code checking and formatting

All you need to do is keep improving the code quality and readability. To achieve this, you need to compress the code, which helps reduce latency and improve web page responsiveness. Most code development processes typically involve a process of code review and code formatting.

But code inspectors can only deal with imperfections in code, and there is only one way to fix them. On the other hand, the goal of the code formatter's work is to identify a set of formatting and style guidelines that must be consistent throughout the project.

ESLint, JSLint, and HSHint are the most commonly used JavaScript code inspection tools, and Prettier is the most commonly used code formatting tool. These tools do not care about the specific meaning of the code, only about the format and standardization of the code. Fortunately, most IDEs or code editors such as Visual Studio code(VSCode), Atom, etc. recognize the importance of writing high-quality code and provide code detection and formatting plug-ins that are easy to set up.

In addition, some IDEs provide useful features such as intelligent code completion, Debug debugging tools, code jumps, and code formatting optimizations. These tools still have a lot of advantages, so it is strongly recommended to use these IDE settings when writing code.

Thank you for reading, the above is the content of "Node.js development example analysis", after learning this article, I believe that everyone has a deeper understanding of Node.js development example analysis, the specific use of the situation also needs to be verified by practice. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!

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