req.checkBody不是一个函数

时间：2017-06-30 00:34:32

标签： javascript node.js express npm

我正在关注Mozilla Express教程（https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/forms）并使用express-validator到达了部分。当我提交一个使用express-validator验证其内容的表单时，我不断收到错误“req.checkBody不是函数”（如果我删除生成该函数的行，我会收到其他错误，例如“req.sanitize not not功能“）。似乎没有正确识别express-validator。我正在使用node v6.3.1来获取它的价值。

已安装

express-validator 

├── async@2.5.0
├── body-parser@1.17.2
├── cookie-parser@1.4.3
├── debug@2.6.8
├── express@4.15.3
├── express-validator@3.2.0
├── moment@2.18.1
├── mongoose@4.11.0
├── morgan@1.8.2
├── nodemon@1.11.0
├── pug@2.0.0-rc.2
└── serve-favicon@2.4.3

我将其加载到主app文件（app.js）

中 
var expressValidator = require('express-validator');

并将其应用于

以下几行 
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(expressValidator()); // Add this after the bodyParser middlewares!

app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

并尝试在另一个模块（genreController.js）中使用它

exports.genre_create_post = function(req, res, next) {

    //Check that the name field is not empty
    req.checkBody('name', 'Genre name required').notEmpty(); 

    //Trim and escape the name field. 
    req.sanitize('name').escape();
    req.sanitize('name').trim();

    //Run the validators
    var errors = req.validationErrors();

我哪里错了？我已安装并卸载它，我已从模块中删除了代码并重新输入，但无济于事。

  req.checkBody is not a function
    TypeError: req.checkBody is not a function
        at exports.genre_create_post (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/controllers/genreController.js:48:9)
        at Layer.handle [as handle_request] (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/layer.js:95:5)
        at next (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/route.js:137:13)
        at Route.dispatch (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/route.js:112:3)
        at Layer.handle [as handle_request] (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/layer.js:95:5)
        at /Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:281:22
        at Function.process_params (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:335:12)
        at next (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:275:10)
        at Function.handle (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:174:3)
        at router (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:47:12)
        at Layer.handle [as handle_request] (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/layer.js:95:5)
        at trim_prefix (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:317:13)
        at /Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:284:7
        at Function.process_params (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:335:12)
        at next (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:275:10)
        at /Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:635:15
        at next (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:260:14)
        at Function.handle (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:174:3)
        at router (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:47:12)
        at Layer.handle [as handle_request] (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/layer.js:95:5)
        at trim_prefix (/Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:317:13)
        at /Users/cerulean/Documents/Projects/express-locallibrary-tutorial/node_modules/express/lib/router/index.js:284:7

3 个答案:

答案 0 :(得分：2)

您的代码中使用require的方式可能就是这样。由于你还没有插入代码的那部分，我假设有几个项目。无论如何，你可以查看一个有效的代码并弄清楚你做错了什么。或者，将整个代码粘贴到此处，我将能够为您提供帮助。

试试这个

// index.js

var util = require('util'),
    logger = require('morgan'),
    bodyParser = require('body-parser'),
    cookieParser=require('cookie-parser'),
    express = require('express'),
    expressValidator = require('express-validator'),
    app = express();

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));
app.use(expressValidator()); // this line must be immediately after any of the bodyParser middlewares! 
app.use(cookieParser());
// app.use(express.static(path.join(__dirname, 'public')));

app.get('/genres', require('./genre-controller.js').genre_create_post);

app.listen(8888);

和genre-controller.js 

// genre-controller.js
exports.genre_create_post = function (req, res, next) {

    console.log('my get method response');

    //Check that the name field is not empty
    req.checkBody('name', 'Genre name required').notEmpty();

    //Trim and escape the name field. 
    req.sanitize('name').escape();
    req.sanitize('name').trim();

    //Run the validators
    var errors = req.validationErrors();

    res.end(errors);
};

package.json是

{
  "name": "44836938-req-checkbody-is-not-a-function",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {
    "body-parser": "^1.17.2",
    "cookie-parser": "^1.4.3",
    "express": "^4.15.3",
    "express-validator": "^3.2.0",
    "morgan": "^1.8.2"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

然后运行

$ npm install
$ node index.js

然后转到http://localhost:8888/genres，您会看到验证工具正在运行..错误将是这样的

TypeError: first argument must be a string or Buffer
    at ServerResponse.OutgoingMessage.end (_http_outgoing.js:549:11)
    at exports.genre_create_post (/home/projects/44836938-req-checkbody-is-not-a-function/genreController.js:15:9)
    at Layer.handle [as handle_request] (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/layer.js:95:5)
    at /home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/index.js:335:12)
    at next (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/index.js:275:10)
    at cookieParser (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/cookie-parser/index.js:70:5)
    at Layer.handle [as handle_request] (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/index.js:317:13)
    at /home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/index.js:335:12)
    at next (/home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express/lib/router/index.js:275:10)
    at /home/projects/44836938-req-checkbody-is-not-a-function/node_modules/express-validator/lib/express_validator.js:445:5

答案 1 :(得分：0)

我得到了它，但我不知道为什么。如果有人能帮我理解，我会很感激。当我删除验证器代码（仅在项目中继续）时，我找到了答案，然后注意到了

req.body

是undefined

用Google搜索了一个答案，它涉及在设置中进一步向下移动路线，所以我尝试了。

我搬了

app.use('/', index);
    app.use('/users', users);
    app.use('/catalog', catalog);  // Add catalog routes to middleware chain.

下面

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

    // uncomment after placing your favicon in /public
    //app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
    app.use(logger('dev'));
    app.use(bodyParser.json());
    app.use(bodyParser.urlencoded({ extended: false }));
    app.use(expressValidator()); // Add this after the bodyParser middlewares!
app.use(cookieParser());
    app.use(express.static(path.join(__dirname, 'public')));

一切正常。

答案 2 :(得分：0)

我遇到了同样的问题，在我的情况下我通过确保app.js中的app.use（expressValidator（））在app.use.bodyParser后面解决了它，我确保路由在bodyparser和app.use（express.static ......） 我认为这与元素的放置顺序有关。

就我而言，似乎有效的顺序：

的ViewEngine

BodyParser中间件

路由

静态文件夹

app.use express validator

在使用此命令之前，Checkbody不作为函数存在，但可以使用函数Body。所以请求。似乎工作但不适用于所有功能。

如果有人可以更好地解释，请执行：）

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