Web project using Node.js to implement online Q&A community functions

Node.js is a JavaScript running environment based on the Chrome browser. It can run JavaScript code on the server side and provides efficient I/O operations, non-blocking IO, and events. Excellent features such as drivers make Node.js widely used in web application development, including web projects that implement online question and answer community functions.

In this article, we will learn how to use Node.js to build an online Q&A community, which includes user registration, login, question, answer and other functions, and will also give specific code examples.

1. Environment setup

Before starting to build an online Q&A community, you need to set up a Node.js environment. Here, we choose to use the Express framework, which is a simple, flexible, and efficient web framework for Node.js.

After installing Node.js, we can use npm to install Express. The specific code is as follows:

npm install express --save

2. User registration

Implement the user registration function It is fundamental content in online Q&A communities. We need to store the user's user name, password and other related information in the database, and also need to perform certain verification on the information entered by the user.

Here, we choose to use MongoDB to store user information and use the bcrypt encryption library to encrypt user passwords. The specific code is as follows:

// 引入相关库
const bcrypt = require('bcrypt')
const { User } = require('../models')

// 用户注册
const register = async (req, res, next) => {
  try {
    const { username, password } = req.body

    if (!username || !password) {
      return res.status(400).send('用户名或密码不能为空')
    }

    const user = await User.findOne({ username })

    if (user) {
      return res.status(400).send('该用户名已被占用，请更换其他用户名')
    }

    const salt = await bcrypt.genSalt(10)
    const hash = await bcrypt.hash(password, salt)

    const newUser = await User.create({
      username,
      password: hash,
    })

    return res.status(201).send(newUser)
  } catch (err) {
    next(err)
  }
}

module.exports = {
  register,
}

3. User login

The user login function is another basic function in the online Q&A community. When a user logs in, the user's input information needs to be verified. If the information entered by the user matches the information stored in the database, the login is successful, otherwise the login fails.

Here, we choose to use the Passport.js library to implement user login verification. The specific code is as follows:

// 引入相关库
const passport = require('passport')

// 用户登录
const login = async (req, res, next) => {
  passport.authenticate('local', (err, user, info) => {
    if (err) {
      return next(err)
    }
    if (!user) {
      return res.status(401).send(info.message)
    }
    req.logIn(user, (err) => {
      if (err) {
        return next(err)
      }
      return res.status(200).send(user)
    })
  })(req, res, next)
}

module.exports = {
  login,
}

4. Question function

The question function is One of the core functions of the online Q&A community. Users can ask their own questions in the community and expect other users to provide solutions.

Here, we need to use MongoDB to store questions raised by users, and also need to encapsulate a route to handle user requests. The specific code is as follows:

// 引入相关库
const { Question } = require('../models')

// 提问
const ask = async (req, res, next) => {
  try {
    const { question, description } = req.body

    if (!question) {
      return res.status(400).send('问题不能为空')
    }

    const newQuestion = await Question.create({
      question,
      description,
      userId: req.user.id,
    })

    return res.status(201).send(newQuestion)
  } catch (err) {
    next(err)
  }
}

module.exports = {
  ask,
}

5. Answer function

The answer function is another core function in the online Q&A community. When other users ask questions in the community, other users can answer the questions based on their own experience or knowledge in the hope of being helpful to the user who asked the question.

Here, we need to use MongoDB to store the answers put forward by users, and at the same time, we need to encapsulate a route to handle user requests. The specific code is as follows:

// 引入相关库
const { Answer, Question } = require('../models')

// 回答问题
const answer = async (req, res, next) => {
  try {
    const { content } = req.body
    const { questionId } = req.params

    if (!content) {
      return res.status(400).send('回答不能为空')
    }

    const question = await Question.findOne({
      _id: questionId,
    })

    if (!question) {
      return res.status(404).send('未找到该问题')
    }

    const newAnswer = await Answer.create({
      content,
      userId: req.user.id,
      questionId: question._id,
    })

    return res.status(201).send(newAnswer)
  } catch (err) {
    next(err)
  }
}

module.exports = {
  answer,
}

6. Summary

In this article, we learned how to use Node.js to build a web project for an online Q&A community, which includes core functions such as user registration, login, questions, and answers. At the same time, we also provide specific code examples, hoping to help developers better understand the application of Node.js in web application development.

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