Express validator always returning error even when valid

I am using postman to send a post request with some data in the body, but express validator is always returning the error array. Here is the index.js code:

import express from "express";
import { router } from "./Routes/CreateUser.js";
import { connect, findFoodItems } from "./db.js";
import { body, validationResult } from "express-validator";


const app = express();
const port = 5000;

await connect();

app.get("/", (req, res) => {
    res.send("Hello World");
});

app.listen(port, () => {
    console.log(`Server is running on port ${port}`);
});

app.post('/createUser', body('name').notEmpty(), (req, res) => {
    const result = validationResult(req);
    if(result.isEmpty())
    {
        return res.send(`Hello ${req.body.name}`);
    }
    res.send({errors: result.array()});
});

I have tried everything but no matter what I do when I send a POST request to localhost50000/createUser whatever name value I give it always returns error array.

You have to parse the body of response by using express middleware json and urlencoded

Express Doc

import express from "express";
import { router } from "./Routes/CreateUser.js";
import { connect, findFoodItems } from "./db.js";
import { body, validationResult } from "express-validator";


const app = express();
const port = 5000;

await connect();

app.use(express.json());    //this
app.use(express.urlencoded({extended:false})); 

app.get("/", (req, res) => {
    res.send("Hello World");
});

app.listen(port, () => {
    console.log(`Server is running on port ${port}`);
});

app.post('/createUser', body('name').notEmpty(), (req, res) => {
    const result = validationResult(req);
    if(result.isEmpty())
    {
        return res.send(`Hello ${req.body.name}`);
    }
    res.send({errors: result.array()});
});