fetch POST and getting "400 (Bad Request)" in React client - Nodejs backend

Question

I am trying to add a new user with a registration form but when I fetch it with the post method to add to the database on MongoDB, I get the response on the screen as you see.

I can see data on the console after filling the registration form, I do that with console button.

Also, I can register a new user on Postman without any problem.

My code is here:

import { useState} from "react";
import { FaUser } from "react-icons/fa";
import { useNavigate } from "react-router-dom";


function Register() {
  
    const [formData, setFormData] = useState({
        name: "",
        email: "",
        password: "",
        password2: "",
    });
    const { name, email, password, password2 } = formData;

    const navigate=useNavigate();

    const onChange = (e) => {
        setFormData({ ...formData, [e.target.name]: e.target.value });
        // console.log(formData);
    }
    const showData=(e)=>{
        e.preventDefault();
        console.log(formData);
    }

    const onSubmit = (e) => {
        e.preventDefault();
        if(password!==password2){
           alert("Password does not match");
        }else{
            fetch("http://localhost:5000/api/users",{   
                mode: 'no-cors',
                method:"POST",
                headers:{
                    "Content-Type":"application/json"
                },
                body:JSON.stringify({
                    name,
                    email,
                    password
                })
            })
            .then(res=>res.json())
            .then(data=>{
                if(data.error){
                    console.log(data.error);
                }else{
                    navigate("/login");
                }
            })
            
        }
    }

   

    return (
    <>

        <section className="heading">
            <h1>
                <FaUser /> Register
            </h1>
            <p>Please create an account</p>
        </section>
        <section className="form">
            <form onSubmit={onSubmit}>
                <div className="form-group">
                    <input type="text" className="form-control" id="name"
                        name="name" value={name} placeholder="Enter your name"
                        onChange={onChange} />
                </div>
                <div className="form-group">
                    <input type="text" className="form-control" id="email"
                        name="email" value={email} placeholder="Enter your email"
                        onChange={onChange} />
                </div>
                <div className="form-group">
                    <input type="text" className="form-control" id="password"
                        name="password" value={password} placeholder="Enter your password"
                        onChange={onChange} />
                </div>
                <div className="form-group">
                    <input type="text" className="form-control" id="password2"
                        name="password2" value={password2} placeholder="Confirm your password2"
                        onChange={onChange} />
                </div>
                <div className="form-group">
                    <button type="submit" className="btn btn-block">Submit</button>
                    <button onClick={showData} className="btn btn-block">Console</button>
                </div>
            </form>
        </section>
    </>
    )
}

export default Register