如何解决在node.js中将数据保存到mongodb的问题？

我构建了一个代码来创建一个带有node.js，express.js和mongodb的服务器。这是一个将用户数据保存到mongodb的简单代码。我用Advanced REST Client测试了这段代码。

此时，请求参数被传输但在使用此url：http://localhost:8080/users发送请求时有0个请求错误。

server.js

var express     = require('express');
var app         = express();
var port        = process.env.PORT || 8080;
var morgan      = require('morgan');
var mongoose    = require('mongoose');
var User        = require('./user');
var bodyParser = require('body-parser');

app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded
app.use(morgan('dev'));

mongoose.createConnection('mongodb://localhost:27017/mean', function(err) {
    if (err) {
        console.log('Not connected to the database: ' + err);
    } else {
        console.log('Successfully connected to MongoDB')
    }
});

// http://localhost:8080/users
app.post('/users', function(req, res) {
    var user = new User();
    user.username = req.body.username;
    user.password = req.body.password;
    user.email = req.body.email;
    if (req.body.username == null || req.body.username == "" || req.body.password == null || req.body.password == "" || req.body.email == null || req.body.email == "") {
      res.send("Ensure username, email and password were provided");
    } else {
        user.save(function(err) {
            if (err) {
                res.send("Username or Email already exists.");
            } else {
                res.send("user created");
            }
        });
    }
});

app.listen(port, function() {
    console.log('Running the server on port ' + port);
});

user.js的

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var bcrypt = require('bcrypt-nodejs');

var UserSchema = new Schema({
    username: { type: String, lowercase: true, required: true, unique: true },
    password: { type: String, required: true },
    email: { type: String, required: true, lowercase: true, unique: true }
});

UserSchema.pre('save', function(next) {

    var user = this;
    bcrypt.hash(user.password, null, null, function(err, hash) {
        if (err) return next(err);
        user.password = hash;
        next();
    });
});

module.exports = mongoose.model('User', UserSchema);

的package.json

{
  "name": "mean",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bcrypt-nodejs": "0.0.3",
    "body-parser": "^2.18.2",
    "express": "^4.16.2",
    "mongoose": "^4.13.7",
    "morgan": "^1.9.0"
  }
}

您应该使用浏览器执行post请求而不是get请求。

也

var user = new User();
    user.username = req.body.username;
    user.password = req.body.password;
    user.email = req.body.email;
    if (req.body.username == null || req.body.username == "" || req.body.password == null || req.body.password == "" || req.body.email == null || req.body.email == "") {
      res.send("Ensure username, email and password were provided");

您没有在请求中发送任何参数，如email或name，....因此，您的数据库中无法保存任何内容。

请post请求而不是get并考虑在您的请求中添加正确的参数，一切都会好的。

如何解决在node.js中将数据保存到mongodb的问题？

我构建了一个代码来创建一个带有node.js，express.js和mongodb的服务器。这是一个将用户数据保存到mongodb的简单代码。我用Advanced REST Client测试了这段代码。

此时，请求参数被传输但在使用此url：http://localhost:8080/users发送请求时有0个请求错误。

server.js

var express     = require('express');
var app         = express();
var port        = process.env.PORT || 8080;
var morgan      = require('morgan');
var mongoose    = require('mongoose');
var User        = require('./user');
var bodyParser = require('body-parser');

app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded
app.use(morgan('dev'));

mongoose.createConnection('mongodb://localhost:27017/mean', function(err) {
    if (err) {
        console.log('Not connected to the database: ' + err);
    } else {
        console.log('Successfully connected to MongoDB')
    }
});

// http://localhost:8080/users
app.post('/users', function(req, res) {
    var user = new User();
    user.username = req.body.username;
    user.password = req.body.password;
    user.email = req.body.email;
    if (req.body.username == null || req.body.username == "" || req.body.password == null || req.body.password == "" || req.body.email == null || req.body.email == "") {
      res.send("Ensure username, email and password were provided");
    } else {
        user.save(function(err) {
            if (err) {
                res.send("Username or Email already exists.");
            } else {
                res.send("user created");
            }
        });
    }
});

app.listen(port, function() {
    console.log('Running the server on port ' + port);
});

user.js的

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var bcrypt = require('bcrypt-nodejs');

var UserSchema = new Schema({
    username: { type: String, lowercase: true, required: true, unique: true },
    password: { type: String, required: true },
    email: { type: String, required: true, lowercase: true, unique: true }
});

UserSchema.pre('save', function(next) {

    var user = this;
    bcrypt.hash(user.password, null, null, function(err, hash) {
        if (err) return next(err);
        user.password = hash;
        next();
    });
});

module.exports = mongoose.model('User', UserSchema);

的package.json

{
  "name": "mean",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bcrypt-nodejs": "0.0.3",
    "body-parser": "^2.18.2",
    "express": "^4.16.2",
    "mongoose": "^4.13.7",
    "morgan": "^1.9.0"
  }
}

您应该使用浏览器执行post请求而不是get请求。

也

var user = new User();
    user.username = req.body.username;
    user.password = req.body.password;
    user.email = req.body.email;
    if (req.body.username == null || req.body.username == "" || req.body.password == null || req.body.password == "" || req.body.email == null || req.body.email == "") {
      res.send("Ensure username, email and password were provided");

您没有在请求中发送任何参数，如email或name，....因此，您的数据库中无法保存任何内容。

请post请求而不是get并考虑在您的请求中添加正确的参数，一切都会好的。