POST data to back-end

form.js

import React, {useState} from "react";

export default function Create() {
    const [state, setState] = useState()

    function changeHandler(event) {
        const {name, value} = event.target

        setState(prevState => ({
            ...prevState,
            [name]: value
        }))
    }

    function submitHandler(event) {
        event.preventDefault()

        fetch('api/create-server', {
            method: 'POST',
            body: JSON.stringify(state),
            headers: {
                'Content-Type': 'application/json;charset=utf-8'
            },
        })
    }

    return (
        <form onSubmit={submitHandler} autoComplete={"off"} method="POST">
            <input type="text" name="name" onChange={changeHandler}/>
            <input type="text" name="IP" onChange={changeHandler}/>
            <input type="text" name="OS" onChange={changeHandler}/>
            <button>Post</button>
        </form>
    )
}