how to store user input value state from react to express js array and variable?

I am Junior React Developer and learning express js. My question is how can i pass user input value from react state to Express js Array & variable. What are the possible ways and which one is better?

React js Code

    import React, {useState} from "react";

function App() {

  const [textValue, settextValue] = useState("");
const [number, setnumber] = useState(10);
const [jsonresponse, setJsonresponse] = useState();

const  handleSubmit = async (e) => {

  return (
    <div className="container">
        <form onSubmit={handleSubmit}>
      <div class="my-3">
        <label forhtml="exampleInputEmail1" className="form-label">Text</label>
        <input type="text" class="form-control" onChange={(e) => settextValue(} id="exampleInputEmail1" aria-describedby="emailHelp" value={textValue} />
        <div className="my-3">
      <input class="form-control"id="number" type="number" placeholder="Number" onChange={(e) => setnumber(} value={number}  /></div>
      <button type="submit" className="btn btn-primary">Submit</button>

Node js File index.js

const PAGE_SIZE = value from react userinput
const KEYWORDS = ['value from react userinput'];

2nd Question: After adding value into variables. An Api will be called and return json response. how can i can pass this JSON Response into react state


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