Mongodb 找不到模块'；猫鼬'；即使安装了猫鼬

我知道Mongoose提供了一个直接的、基于模式的解决方案来为应用程序数据建模。它包括内置类型转换、验证、查询构建和业务，所以这里是我的代码

我的模型上有以下模式：

const mongoose = require("mongoose");
const crypto = require("crypto");

const userSchema = new mongoose.Schema(
  {
    username: {
      type: String,
      trim: true,
      required: true,
      max: 32,
      unique: true,
      index: true,
      lowercase: true,
    },
    name: {
      type: String,
      trim: true,
      required: true,
      max: 32,
    },
    email: {
      type: String,
      trim: true,
      required: true,
      unique: true,
      lowercase: true,
    },
    profile: {
      type: String,
      required: true,
    },
    hashed_password: {
      type: String,
      required: true,
    },
    salt: {
      type: String,
    },
    about: {
      type: String,
    },
    role: {
      type: Number,
      trim: true,
    },
    photo: {
      data: Buffer,
      contentType: String,
    },
    resetPasswordLink: {
      data: String,
      default: "",
    },
  },
  { timestamp: true }
);

userSchema
  .virtual("password")
  .set(function (password) {
    // create a temporary variable called _password
    this._password = password;
    // generate salt
    this.salt = this.makeSalt();
    // encryptPassword
    this.hashed_password = this.encryptPassword(password);
  })
  .get(function () {
    return this._password;
  });

userSchema.methods = {
  authenticate: function (plainText) {
    return this.encryptPassword(plainText) == this.hashed_password;
  },

  encryptPassword: function (password) {
    if (!password) return "";
    try {
      return crypto.createHmac("sha1", this.salt).update(password).digest("hex");
    } catch (err) {
      return "";
    }
  },

  makeSalt: function () {
    return Math.round(new Date().valueOf() * Math.random() + "");
  },
};

module.exports = mongoose.model("User", userSchema);

但这返回了以下错误：

Error: Cannot find module 'mongoose'
Require stack:
- C:\Users\Jones\Desktop\multiblog\models\user.js
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    'C:\\Users\\Jones\\Desktop\\multiblog\\models\\user.js',
    'C:\\Users\\Jones\\Desktop\\multiblog\\controllers\\auth.js',
    'C:\\Users\\Jones\\Desktop\\multiblog\\backend\\routes\\auth.js',
    'C:\\Users\\Jones\\Desktop\\multiblog\\backend\\server.js'

你知道我在这里遗漏了什么吗？我保证我的

package.json

安装了mongoose

我还查看了模式的其他文件和结构，结果很好

你认为我的错误是什么

更新：

package.json

{
  "name": "backend",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "nodemon server.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.19.0",
    "cookie-parser": "^1.4.5",
    "cors": "^2.8.5",
    "dotenv": "^8.2.0",
    "express": "^4.17.1",
    "express-jwt": "^6.0.0",
    "express-validator": "^6.10.0",
    "formidable": "^1.2.2",
    "jsonwebtoken": "^8.5.1",
    "lodash": "^4.17.21",
    "mongoose": "^5.12.3",
    "morgan": "^1.10.0",
    "nodemon": "^2.0.7",
    "shortid": "^2.2.16",
    "slugify": "^1.5.0",
    "string-strip-html": "^8.2.12"
  }
}

---

rm-rf节点\u模块包-lock.json&&npm安装&npm启动

---

如果这不起作用，我很确定您的一些文件夹不在您当前使用Mongo或express应用程序的文件夹中。

尝试删除

node\u模块

文件夹和

package lock.json

文件，然后运行

npm install

命令。我尝试了相同的输出。在您的问题中添加package.json文件。我刚刚更新。