req.checkBody不是一个函数
我正在使用Mozilla Express教程（ https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/forms ），并使用express-validator来访问该部分。 当我提交一个表单，其内容使用express-validator进行validation时，我总是收到错误“req.checkBody不是一个函数”（如果我删除了生成该行的行，则会得到其他错误，如“req.sanitize is not一个函数“）。 似乎表示validation程序没有被正确识别。 我使用节点v6.3.1，无论它是值得的。
express-validator被安装
├── 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 我加载它的主要应用程序文件（app.js）
var expressValidator = require('express-validator');
并在下面的几行应用它
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？ 我已经安装并卸载它，我已经从模块中删除了代码，然后重新input，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
也许是你在代码中使用的方式。 因为你没有插入代码的那部分，我假设了一些项目。 无论如何，你可以检查一个工作代码，并找出你做错了什么。 或者，在这里粘贴整个代码，我将能够帮助你。
尝试这个
// 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
并转到http://localhost:8888/genres ，你会看到validation工作..错误将是这样的事情
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
我得到它的工作，但我不知道为什么。 如果有人能帮助我理解，我会很感激的信息。 当我删除validation器代码（只是为了继续在项目中），然后注意到这一点，我追查了答案
req.body
undefined
谷歌search了一个答案，它涉及在设置中进一步下移路线，所以我试了一下。
我搬家了
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。
我有同样的问题，在我的情况下，我解决了这个问题，确保在App.js app.use（expressValidator（））是在app.use.bodyParser后面，我确保路由是在bodyparser和应用程序.use（express.static ……）我认为这与元素的放置顺序有关。
在我的情况下，似乎工作的顺序：
视图引擎
BodyParser中间件
路线
静态文件夹
app.use表示validation器
在使用这个命令之前Checkbody不是作为一个函数存在的，但是可以使用函数Body。 所以要求。 似乎工作，但不是所有的function。
如果一个人可以更好地解释请做:)