Why is the name variable empty when it is sent to my postgres database?

I am trying to Post data in my postgres database using javascript and express. I think that the “app.use(express.json());” line in my code is the one giving me problem, but I’m new to javascript and I’m not comfortable yet with middleware.

This is the error I receive in my terminal after making the POST request with postman (it might be slightly different because i translated it from french)

error: a NULL value violates the constraint NOT NULL in the column « name » in the table « players » 

This is the value of the fields i try to insert in my table:

(4, null, null, null)

This is my code

import express from 'express';
import pkg from 'pg';

const { Pool } = pkg;
const db = new Pool({
    user: "postgres",
    host: "localhost",
    database: "postgres", 
    password: "123456", 
    port: 5433
});

const app = express();
const port = process.env.PORT || 3000;

app.use(express.json());

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

app.post('/players', async (req, res) => {
    console.log(req.body);
    const {
        name,
        email,
        password,
        } = req.body;
    try{
        const client = await db.connect();
        const result = await client.query(
            'INSERT INTO players (name,email,password) VALUES ($1, $2, $3) RETURNING *', 
            [name,email,password]);
            res.status(201).json(result.rows[0]);
            client.release();
        } catch(err){
            console.error(err);
            res.status(500).send('Error creating user');
        }
    });

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

I was expecting the value to be the same as the body of my POST request :

{
    "name": "Zelda",
    "email": "[email protected]",
    "password": "zelda123",
}

The server is working because if I make the get request, I get back “Hello world”