I can't store data into MongoDB(Atlas) on Postman (Node.js with express)

It’s my first post.

I’m trying to post a data which is object includes “title”,”body”,”snippet” into backend which I use Mongo DB Atlas.

However when I test it on postman, I can’t store those data into a schema which is prepared in model.

The error message:

 “   title: MongooseError [ValidatorError]: Path `title` is required.
        at new ValidatorError ”

Others(body,snippet) are also null.

app.js:

const express = require('express'),
      mongoose = require('mongoose'),
      cors = require('cors'),
      app = express(),
      blogRoutes = require('./routes/blogRoute');

// connect to mongoDB
const dbURI = '';
mongoose.connect(dbURI,{ useNewUrlParser: true,useUnifiedTopology: true } )
.then(result => {
    // Listen for requests
    app.listen(3000);
})
.catch((err) => console.log(err));

// Middleware & static files
app.use(express.urlencoded({ extended: true }))

// cors
app.use(cors({ origin: true, credentials: true }))

//Blog Router
app.use('/blogs/api',blogRoutes);

//404
app.use((req,res) => {
    res.render('404',{ title:'Not Found' });
})

Model file:

const mongoose = require('mongoose'),
      Schema = mongoose.Schema;

const blogSchema = new Schema({
    title:{
        type:String,
        required:true
    },
    snippet:{
        type:String,
        required:true
    },
    body:{
        type:String,
        required:true
    },
}, { timestamps:true })

// create model
const Blog = mongoose.model('Blog',blogSchema);

module.exports = Blog;

Controller(store):

// Store
const blog_create_post = async (req,res) => {
    const {title,snippet,body} = req.body;
    try {
        const blog = await Blog.create({ title,snippet,body });
        res.status(201).json(blog);
        console.log(blog);
    } catch (error) {
        res.status(400);
    }
}

router: // Store

router.post('/',blogController.blog_create_post)

Even though GET works fine, I’m stuck in this error for a long time on POST method…

I would appreciate if you suggest something.