express-validator

Question

我已经尝试解决这个问题 2 个小时了，但我有点沮丧。基本上，我想验证表单输入，但我总是收到此错误。

TypeError: req.checkBody is not a function
at C:\Users\bobbo\Desktop\Develops\Project_folder\routes\index.js:19:7
at Layer.handle [as handle_request] (C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\layer.js:95:5)
at next (C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\layer.js:95:5)
at C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\index.js:281:22
at Function.process_params (C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\index.js:335:12)
at next (C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\index.js:275:10)
at Function.handle (C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\index.js:174:3)
at router (C:\Users\bobbo\Desktop\Develops\Project_folder\node_modules\express\lib\router\index.js:47:12)

几乎我能找到的唯一信息是告诉我写 app.use(expressValidator()); 在 app.use(bodyParser.json()); app.use(bodyParser.urlencoded({ extended: false })); 之后，但不管我做什么，我仍然会遇到同样的错误。这是我使用的代码。

//index.js    
    var express = require('express');
    var bodyParser = require('body-parser');
    var app = express();
    var expressValidator = require('express-validator');

    app.use(bodyParser.json());
    app.use(bodyParser.urlencoded({ extended: false }));
    app.use(expressValidator());
    var router = express.Router();
    router.get('/', function(req, res, next) {
      res.render('index', { title: 'Express' });
    });

    router.get('/signup', function(req, res, next) {
      res.render('signup', { title: 'Express' });
    });

    router.post('/signup', function(req, res){
      var name = req.body.name;
      console.log(name);    //works
      req.checkBody("name", "Invalid name").notEmpty();
      var errors = req.validationErrors();
      if(errors){
        console.log('errors');
      } else{
        console.log('no errors');
      }
    });
    module.exports = router;

app.js

//app.js
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var bodyParser = require('body-parser');
var expressValidator = require('express-validator');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// BodyParser Middleware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

package.json

    //package.json
{
  "name": "pizzaonline",
  "version": "0.0.0",
  "private": true,
  "scripts": {
    "start": "node ./bin/www"
  },
  "dependencies": {
    "body-parser": "^1.18.3",
    "cookie-parser": "~1.4.3",
    "debug": "~2.6.9",
    "express": "~4.16.0",
    "express-session": "^1.15.6",
    "express-validator": "^5.2.0",
    "http-errors": "~1.6.2",
    "morgan": "~1.9.0",
    "pug": "2.0.0-beta11"
  }

}

如果我注释掉 req.checkBody("name", "Invalid name").notEmpty();，下一个要执行的快速验证代码是 var errors = req.validationErrors();，给我一个相同的错误，告诉我 req.validationErrors() 不是一个函数。我是新手，但这告诉我 express-validator 没有正确安装，我错了吗？任何帮助深表感谢。提前致谢。

Answer 1

在您的嵌套路由文件（index.js 和 users.js）中，您正在创建新的应用程序实例并将该验证器附加到它，但实际上这是不正确的。

原因是创建新的应用程序实例您在 app.js 中创建了不同于 app 的新应用程序上下文。

所以这是解决方法：

1) 在 app.js 文件的这一行上方附加快速验证器：

app.use(expressValidator());


app.use('/', indexRouter);
app.use('/users', usersRouter);

2) 从嵌套路由文件中删除 app 对象生成并使其看起来像：

//index.js    
var express = require('express');
var router = express.Router();

router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });
});

router.get('/signup', function(req, res, next) {
  res.render('signup', { title: 'Express' });
});

router.post('/signup', function(req, res){
  var name = req.body.name;

  req.checkBody("name", "Invalid name").notEmpty();
  var errors = req.validationErrors();
  if(errors){
    console.log('errors');
  } else{
    console.log('no errors');
  }
});

module.exports = router;

Answer 2

npm i --save express-validator@4

reqiure app.js

app.use(expressValidator());

再试一次

npm start

express-validator - req.checkBody 不是函数

express-validator - req.checkBody is not a function

javascript

node.js

express

npm