Question 116046 in Mongodb Question posted in
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trying to post my blog collection to mongoDB

i’m new to nodeJS. am trying a use post request to get the information the user post but am getting an error: TypeError: Cannot read properties of undefined (reading ‘title’). please what am i doing wrong here.

here’s my code

const express = require("express")
const app = express()
const mongoose = require("mongoose")
const Schema = mongoose.Schema;

const BlogPost = new Schema({
    title:{
        type: String,
        required: true
    },
    content: {
        type: String,
        required: true
    },
    body: {
        type: String,
        required: true
    }
})

const Blog = mongoose.model("Blog", BlogPost)
module.exports = Blog;

app.post("/blogs", (req, res) => {
    const blogs = new Blog({
        title:req.body.title,
        content: req.body.content,
        body: req.body.body,
    })
    blogs.save()
    .then(result => console.log(result))
    .catch(err => console.log(err))
})
Tags:

2

Answers


  1. 0

    You may not get title from req.body.title that’s why when you save this doc to mongodb it will throw this error.

    For solution, you must check req.body.title before saving data into mongodb,
    Otherwise, simply REMOVE required: true from schema

    title:{
    type: String,
    required: true
},
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  2. 0

    To make this code to workable condition for that add app.use(express.json())

    As we are accepting http request body value from postman , so that it will parse our http request into json payload,

    Hence we can access the body parameters value by req.body..

    const express = require("express")
const app = express()
const mongoose = require("mongoose")
const Schema = mongoose.Schema;

// 2 json parsing
app.use(express.json())

//as my mongoose version is latest one so in that strictQuery is not supported
mongoose.set('strictQuery', false);

const BlogPost = new Schema({
    title: {
        type: String,
        required: true
    },
    content: {
        type: String,
        required: true
    },
    body: {
        type: String,
        required: true
    }
})

const Blog = mongoose.model("Blog", BlogPost)
module.exports = Blog;

//3. connection bridge between applicaion and mongoose
const connectionUrl = 'mongodb://127.0.0.1:27017'
mongoose.connect(connectionUrl, {
    useNewUrlParser: true
},()=>{
    console.log('Connected to MongoDB')
})


//Middleware

app.post("/blogs", (req, res) => {
    //console.log(req.body.title+ "  "+ req.body.content+ "  "+ req.body.body );
    const blogs = new Blog({
        title: req.body.title,
        content: req.body.content,
        body: req.body.body,
    })
    blogs.save()
        .then(result => console.log(result))
        .catch(err => console.log(err))
})

// 1.listen 
app.listen(3033, () => {
    console.log("Server is running on port 3033")
});

/**
 * use post request to get the information 
 * the user post but getting an error: 
 * TypeError: Cannot read properties of undefined (reading 'title').
 */

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