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Node.js Case Studies

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nodejsDebugging
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Node.js Debugging

1. Debugging Steps

Step 1: Start the Inspector

Use nodemon to start in debug mode:

nodemon --inspect-brk xx.js

Example output:

[nodemon] starting `node --inspect-brk /Users/maoxunxing/alibaba/vite-comp/bin/index.js`
Debugger listening on ws://127.0.0.1:9229/b789951b-b593-482e-a365-575f547e3fc3
For help, see: https://nodejs.org/en/docs/inspector
Debugger attached.

Step 2: Enable Listening in Chrome

  1. Open the Chrome browser and navigate to the following address:
    chrome://inspect/#devices
  2. Configure the debugging address to 127.0.0.1:9229.
  3. Click the Inspect button to enter the debugging interface.

2. More Advanced Topics

Refer to the official documentation for more debugging techniques and configuration methods:

Node.js Case Studies

<ref *1> Error: connect ECONNREFUSED 127.0.0.1:7001 at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1247:16) { errno: -61, code: 'ECONNREFUSED', syscall: 'connect', address: '127.0.0.1',

This error occurs when starting a local Node.js service. It’s not because the port is occupied, but because the Node.js version is incorrect. Using version 14 works. Specify Node.js version in WebStorm:

WebStorm Node Version

WebStorm Node Version

vscode: launch.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Launch Program",
            "skipFiles": [
                "<node_internals>/**"
            ],
            "program": "${workspaceFolder}/src/node.js"
        }
    ]
}

NodeParty Notes

1. Testing and Tools

Fixtures

  • Definition: Fixtures are integrated debugging data used for data preparation and simulation in a test environment.

Marmot

  • Purpose: CI/CD toolchain.
  • Features:
    • Provides a high-efficiency development process.
    • Supports Node BFF (Backend For Frontend) services to improve front-end development efficiency.

JSON Schema Protocol

  • Definition: A protocol used to describe the structure of JSON data.
  • Application: Often used for API definition and validation.

2. Teams and Projects

Xudafeng (徐达峰)

  • Contributions:
    • Open-source project contributor, driving the development of front-end technology.
    • Related projects include apfe-ci and amur graphql.

Ant Design

  • Positioning: A UI component library for business-oriented applications.
  • Features:
    • High Reusability: Provides a complete toolchain and JS-SDK.
    • Rich Scenarios: Supports complex business scenarios.

3. Front-End Complexity and Solutions

Manifestations of Front-End Complexity

  • Mainly reflected in diverse business scenarios.
  • Solutions:
    • Use highly reusable toolchains (e.g., apfe-ci).
    • Introduce Node BFF services to reduce front-end and back-end coupling.

Cross-Platform Development

  • Challenges:
    • Updating large objects can cause performance issues.
    • Compatibility between different platforms.
  • Solutions:
    • Use a virtual DOM (e.g., vm-vdom-page-view) for optimization.
    • Add flags in the DOM to distinguish between different states.

4. Permissions and Security

Permission Management

  • Two Types:
    1. API-Level Permissions: Control interface access.
    2. Field-Level Permissions: Fine-grained control over data field access.
  • Implementation:
    • Use Sessions or Tokens for authentication.
    • Permission management is usually targeted at SPAs (Single Page Applications).

5. Real-Time Monitoring and Animation

Chameleon

  • Function: A real-time monitoring system to help quickly discover and resolve issues.

Animation Engine

  • Role: Enhance user experience through interactive innovation.
  • Application Scenarios: Animation effects in complex interactive scenarios.

6. Technical Frameworks and Protocols

Service Mesh

  • Definition: A microservices architecture pattern for inter-service communication.
  • Related Technology: sofa-rpc-node.

Amur GraphQL

  • Features:
    • Provides a flexible way to define APIs.
    • Supports complex data queries and operations.

Scheme API Definition

  • Background: Can generate multiple nested requests.
  • Advantages: Improves the flexibility and reusability of interfaces.

7. Performance Optimization

QPS (Queries Per Second)

  • Definition: Queries Per Second, an important metric for measuring system performance.
  • Optimization Directions:
    • Reduce unnecessary requests.
    • Use caching mechanisms.

TWA (Trusted Web Activity)

  • Purpose: To achieve a smoother web application experience on the Android platform.
  • Advantages: Improves performance and consistency in cross-platform development.

8. Other Technical Points

Alipay App in Each Country

  • Features:
    • Customized development according to the needs of each country.
    • Supports localized payment and financial services.

SDK Documentation and Development

  • What Programmers Focus On:
    • Clear documentation.
    • Easy-to-use development tools.

Team Tool Accumulation

  • Practice: Gradually accumulate and improve the toolchain based on business needs.

References