REACT fetch post request

This is how I made my post request in React.js;

const res = fetch('http://15.11.55.3:8040/Device/Movies', {
    method: 'post',
    headers: { 'Content-Type': 'application/json' },
    body: {
     id: 0,
    },
   })
   .then((response) => response.json())
   .then((responseJson) => {
     return responseJson.movies;
   })
   .catch((error) => {
     console.error(error);
   });

we need to make sending data as json stringify

handleSubmit(event){ 
    event.preventDefault();
    fetch('/', {
       method: 'post',
       headers: {'Content-Type':'application/json'},
       body: JSON.stringify({
            "first_name": this.state.firstName
       })
    });
};

I guess the way you are using ref has been deprecated. try below see if you have any luck.

export default class Form extends React.Component {
 constructor(props){
  super(props);
  this.handleSubmit = this.handleSubmit.bind(this);
 }

 handleSubmit(event){ 
  event.preventDefault();
  fetch('/', {
   method: 'post',
   headers: {'Content-Type':'application/json'},
   body: {
    "first_name": this.firstName.value
   }
  });
 };

 render () {
  return (
   
   <div id="signup">
    <form onSubmit={this.handleSubmit}>
        <input ref={(ref) => {this.firstName = ref}} placeholder="First Name" type="text" name="first_name"/><br />
        <input ref={(ref) => {this.lastName = ref}} placeholder="Last Name" type="text" name="last_name"/><br />
       <button type="Submit">Start</button>
    </form>
​
   </div>
​
  )
 }
}

Here is a link to react docs about refs