var express = require('express');
var mysql=require('mysql');
var bodyParser = require('body-parser');
var con=mysql.createConnection({
host:"localhost",
user:"root",
password:"",
database:"nodedb"
});
var app = express();
app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());
app.post('/reg', function (req, res) {
var name=req.body.user_name;
console.log(name);
con.query("SELECT * FROM users WHERE email = ?", [req.body.email],
function(err,result){
if(result.length > 0){
console.log('mail already exist');
res.json('mail already exist');
}
else{
con.query("INSERT INTO users (`name`,`email`,`contact`,`password`) VALUES (?,?,?,?) ", [req.body.user_name,req.body.email,req.body.contact_no, req.body.user_password],
function(err1,result1){
if(err1){
console.log('failed');
res.json(err1);
}
else{
console.log('1 recoed inserted');
res.json(result1);
}
})
}
})
}
req.body.user_name print undefined in console and null on postman. It
is working on web page but not on postman. What should i do now. I looked in many websites but i didn't get answer.
You need to select the correct header content type: x-www-form-urlencoded
Hope it helps.
In the body of postman, make sure you are using raw and make the Application type to Application/json, then you can mention
{
"user_name": "Your_name"
}
You might not have initialized the middleware for using the body parser. Here's how you can do it:
Put app.use(express.json()); in the entry point of your project.
Related
I can't understand why I'm getting an empty req.body {} in client side I get undefined or when I try to use payload = req.body.payload and console.log(payload) I get undefined on the server side and on the client side I get (chrome developer tool console)
ERROR TypeError: Cannot read properties of null (reading 'payload').
What I don't understand is the server receives the request payload(status 201) the response payload is empty, also correct me if I'm wrong the response is a JavaScript object and in the service the original payload is contained so shouldn't I get that in the response.
I have looked at many topics that have the same issue. I'm already doing things that fixed some of the issues.
I have a Content-Type application/json, I apply the app.use(json()) before I use my routes, which seemed to have been the problem with some. Yet I still get empty re.body. I have tried so many things with no luck. Am I missing something? Code snippet.
I would appreciate a point in the right direction
Thanks In Advance
PH.
service.ts
export interface Products{
_id: string,
name: string
}
#Injectable({
providedIn: 'root'
})
export class SearchService {
constructor(private http:HttpClient) { }
searchProducts(query:string){
console.log("Does it get my searchProducts");
return this.http.post<{payload: Array<Products>}>(productsUrl, {payload: query}, {
headers: new HttpHeaders({'Content-Type': 'application.json'})
}).pipe(
map(data => data.payload)
);
}
}
header.ts
sendData(event:any){
//console.log(event.target.value);
let query:string = event.target.value;
//Will match if query is nothing or only spaces
let matchSpaces:any=query.match(/\s*/);
console.log("What about match");
if(matchSpaces[0] === query){
console.log("What about query");
//.products=[];
console.log("what is in collection", this.products);
this.hasQuery = false;
return;
}
console.log("about to call service")
this.searchService.searchProducts(query.trim()).subscribe((results) =>{
console.log("does it get pass subscribe")
// this.products = results;
this.hasQuery = true;
console.log(results);
})
}
route file getProducts.js
var express = require('express');
const cors = require('cors');
var bodyParser = require('body-parser')
const Products = require('../../../liveSearch');
const { query } = require('express');
var router = express.Router();
const app = express();
router.get('/', function(req, res){
res.send('GET route on api here.');
});
/*router.post('/getproducts', function(req,res){
res.send("Trying to post")
});*/
/*app.use(cors());
var corsOptions = {
origin: 'http://localhost:4200',
optionsSuccessStatus: 200 // some legacy browsers (IE11, various SmartTVs) choke on 204
}*/
router.post('/getProducts', async(req, res) =>{
let payload=req.body;
//let payload= req.body.payload;
let search = await Products.find({name: {$regex: new RegExp('^'+payload+'.*',
'i')}}).exec();
//Limit search to 10
search = search.slice(0, 10);
console.log("Payload", payload)
//.log("Inside search",search);
res.status(201).json(payload) //added to see why I couldn't get
response
// res.send({payload:search});
})
server.js
const express = require('express');
const cors = require('cors');
const router = express.Router();
var bodyParser = require('body-parser');
const Products = require('./liveSearch');
const getProducts = require('.../../controllers/api/getProducts/getProducts')
//const products = require('.../../routes/products.js')
const mongoose = require('mongoose');
//mongoose.Promise = Promise;
mongoose.connect('mongodb://localhost/productLiveSearch', {useNewUrlParser:
true, useUnifiedTopology: true, });
const db = mongoose.connection;
db.on('error', error => console.log(error));
db.once('open', () =>{ console.log('Connected to Mongoose')});
const app = express();
app.use(function(req,res,next){
res.header('Access-Control-Allow-Origin', '*');
res.header('content-type','application/json');
res.header('Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization');
res.header('Access-Control-Allow-Methods','POST, GET, DELETE, PUT, OPTIONS');
res.header('Allow', 'GET, POST, OPTIONS, PUT, DELETE');
next();
});
app.use(cors());
var corsOptions = {
origin: 'http://localhost:4200',
optionsSuccessStatus: 200 // some legacy browsers (IE11, various SmartTVs) choke on 204
}
app.use(express.json());
app.use(express.urlencoded({extended:true}));
// app.use(express.json({ limit: "1000mb" }));
// app.use(express.urlencoded({ limit: "1000mb", extended: true }));
app.use('/', getProducts);
app.use('/getProducts', getProducts);
app.get('/', function(req, res){
res.send('hello world');
});
app.listen(process.env.Port|| 3000, () => {
console.log("Server has started on Port 3000");
});
I'm working with Express.js and mysql package to create my apis, but i can't make a post.
This is my code so far:
const express = require('express');
const mysql = require('mysql');
const config = mysql.createConnection({
host: theHost,
port: thePort,
user: theUser,
password: thePass,
database: theDB,
});
const app = express();
config.connect(function(err){
if(!err) {
console.log("Success");
} else {
console.log("Error trying to connect");
}
});
app.get("/api/InternalAccess", function(req, res){
config.query('SELECT * from InternalAccess', (error, result) => {
if (error) throw error;
res.send(result);
});
});
app.post("/api/internalAccess", function(req, res){
var info = { User: req.body.User, Password: req.body.Password, CreationDate: req.body.CreationDate };
config.query('INSERT INTO InternalAccess SET ?', info, (error, result) => {
if (error) throw error;
res.send(result);
});
});
app.listen(3000);
I have no problems with get, it works fine, but to make post from postman, i get the error: " Cannot read property "User" of undefined". Am i avoiding something? I'm really new using mysql package.
My db is MySQL Workbench, and as i said, i'm using Node.js, Express.js and mysql package.
Hope you can help me. Thanks in advance
In order to have req.body populated automatically, you have to use some body-parser middlewares, like:
app.use(express.json()) // for parsing application/json
app.use(express.urlencoded({ extended: true })) // for parsing application/x-www-form-urlencoded
Of course, there can be multiple other causes (like, you're not constructing the request properly in postman), but the lack of setting the middlewares is the first place I'd fix.
Seems like req.body is null. I think you might just be missing the body-parser in your app.js.
var bodyParser = require('body-parser');
var app = express();
// parse application/json
app.use(bodyParser.json())
see other examples here: https://expressjs.com/en/resources/middleware/body-parser.html
I am new in angular and node js. I want to know how angular connect with node js with mysql server. Which simple return query result. Can anyone help me.
Angular is a fronend framework and nodejs can be used to implement a backend for a system. And you can use mysql as your DBMS.
You have to implement your backend and frontend separately. From backend you are exposing endpoints, routes, apis to the external applications.
And you can access those apis,routes from angular using HttpClient module. You can make Http requests using that.
Hope this helps
You may need to use some libraries to make a connection between angular frontend and backend with MySQL database.
You will need the express.js to handle the backend for the data request. Because you use the MySQL database, the database language would be different from any others such as MongoDB. The express provided database integration for the different databases.
You also need a body-parser as a middleware to parse the request body. This is a very important part of your project. The req is very complicated and this middleware can help to get the information which you need.
Here is a sample of how to use express connect mysql.
var express = require('express');
var query = require('./query')
var bodyParser = require('body-parser');
var cookieParser = require('cookie-parser');
var app = express();
//Middleware for bodyparsing using both json and urlencoding
app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json())
app.all('*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS');
res.header("Access-Control-Allow-Headers", "X-Requested-With");
res.header('Access-Control-Allow-Headers', 'Content-Type');
next();
});
//login
app.post('/login',(req,res)=>{
var opts = req.body;
query(" SELECT *FROM `v_users` WHERE userAcount = ?",opts.userName).then((result)=>{
var response = result[0];
if(opts.password !== response.u_password){
return res.send({
errorCode:'404',
errorMsg:'password error'
})
}
//loginToken
var loginToken = response.userAcount + Math.random()*Math.pow(10,16)
res.send({
loginToken:loginToken
})
})
})
var server = app.listen(3000,()=>{
console.log('success')
})
Here is the query method:
(function() {
var mysql = require('mysql');
// var session = require('cookie-session');
var query = (sql,key) => {
var connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: 'root123',
database: 'm_users'
});
connection.connect()
var promise = new Promise((resolve,reject)=>{
connection.query(sql,[key], function(error, results, fields) {
if(error){
reject(error)
}else{
resolve(results);
}
});
connection.end();
});
return promise;
}
module.exports = query;
})()
I've set up a node server that passes requests to a utility class.
So far the POST request is hit but the mapping to the body property values are undefined. Bodyparser is also used in the post method to assist in the Json parse.
I stepped into the request and see that the body is populated and see that the property names are correct as shown in the paste below:
body: { '{\n\t"Email":"brian#gmail.com",\n\t"Dashboard_Name":"my dash 4",\n\t''},
But the below mapping to the values assinged via req.body.propertyname return undefined:
var p_email = req.body.Email;
var p_dashboardName = req.body.Dashboard_Name;
Question:
How can you parse JSON properties from request body in express server?
JSON object posted:
This is the JSON that I post to the server using Postman:
{
"Email":"brian#gmail.com",
"Dashboard_Name":"my dash 4"
}
Gist of the express server and associated utility method SaveUserProfile:
Express server -
var express = require('express');
var UserLDAP = require('./utilities/UserLDAP'); //utility file containing the POST method
var bodyParser = require('body-parser');
const url = require('url');
const app = express();
var sql = require('mssql');
const cors = require('cors');
const path = require('path');
sql.connect("********************************************************************")
.then((connection1) => {
sql.globalConnection = connection1;
app.use(cors());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.post('/OOO/SaveUserProfile', UserLDAP.SaveUserProfile)
app.listen(process.env.PORT || 4000 );
logger.info(`listening to port ${process.env.PORT}`);
}).catch((err) => {
res.status(500).send(err.message);
logger.error(err.message);
});
UserLDAP.js -
var sql = require('mssql');
var bodyParser = require('body-parser');
//Save User Profile
exports.SaveUserProfile = function(req, res) {
req.app.use(bodyParser.json());
req.app.use(bodyParser.urlencoded({ extended: true }));
var request = new sql.Request(sql.globalConnection);
console.log(req);
var p_email = req.body.Email;
var p_dashboardName = req.body.Dashboard_Name;
};
Turns out I had incorrect content-type set in Postman on the object being posted. Needed to be set as:
application/json; charset=UTF-8
Currently you have no way of knowing if a parser like body-parser.json has produced an error which seems the obvious place to start given the content is there but the result isn't.
I had a look at body-parser and found an issue that spoke to the problem of detecting a json error which I would expect to be good to know.
The developer suggested the following as one method.
app.use(errorFork(bodyParser.json(),
function (err, req, res, next) {
// do stuff with only body parser errors
}))
// this is an example; you can use any pattern you like.
function errorFork(middleware, errorHandler) {
middleware(req, res, function (err) {
if (err) {
return errorHandler(err, req, res, next)
}else{
return next()
}
})
}
It isn't a fix but it would give you more info. Something is going wrong with the parsing by what you have indicated the questin is what? The other thing I noticed about your pasted body content is that it isn't valid json (ignoring \n\t) you have a few rouge ' in there, worth checking. Try copying what is in body (raw) and put it through a json validator site like jsonlint.com just as a double check and see if body-parser is returning any errors.
Where in the request object is the json?
For example I know I can use body-parser to do this
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.post('/', function(req, res){
console.log(req.body)
res.json({ message: 'goodbye'})
})
And start my server and hit it with
curl -H "Cont/json" -X POST -d '{"username":"xyz"}' http://localhost:3000/
but is there a way to do it without the body parser includes? Can I just see the json in the request?
You could do it through node stream as below
app.post('/', function(req, res){
var body = "";
req.on("data", function (data) {
body += data;
});
req.on("end", function() {
console.log(JSON.parse(body));
res.json({ message: 'goodbye'})
});
})
Yep, you can
//pipe to any writable stream
req.pipe(process.stdout);
Sure if u want - u may save it to string using something like this
var tmpstr = "";
req.on("data", function (data) {
tmpstr += data;
});
req.on("end", function() {
//do stuff
console.log("\ndata length is: %d", tmpstr.length);
});