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To submit a form in React and send a request to your Node.js server to interact with a MySQL database, you can follow these steps:

1. Create a form component in your React application that collects the necessary data from the user.
2. When the user submits the form, handle the form submission by sending a POST request to your Node.js server using the fetch API or a library like Axios.
3. In your Node.js server, create a route to handle the POST request and extract the data from the request body.
4. Use a MySQL library like mysql or sequelize in your Node.js server to interact with your MySQL database and perform the necessary database operations (e.g., insert data into a table).
5. Send a response back to the client to let them know if the operation was successful.

Here's an example of how you can implement this:

React form component:

import React, { useState } from 'react';

const MyForm = () => {
  const [formData, setFormData] = useState({
    name: '',
    email: ''
  });

  const handleSubmit = async (e) => {
    e.preventDefault();

    try {
      const response = await fetch('http://localhost:3000/api/form-submit', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: JSON.stringify(formData)
      });

      if (response.ok) {
        console.log('Form submitted successfully');
      } else {
        console.error('Failed to submit form');
      }
    } catch (error) {
      console.error('Error submitting form:', error);
    }
  };

  const handleChange = (e) => {
    setFormData({
      ...formData,
      [e.target.name]: e.target.value
    });
  };

  return (
    <form onSubmit={handleSubmit}>
      <input type="text" name="name" value={formData.name} onChange={handleChange} />
      <input type="email" name="email" value={formData.email} onChange={handleChange} />
      <button type="submit">Submit</button>
    </form>
  );
};

export default MyForm;

Node.js route handling the form submission:

const express = require('express');
const bodyParser = require('body-parser');
const mysql = require('mysql');

const app = express();
app.use(bodyParser.json());

const connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'mydatabase'
});

app.post('/api/form-submit', (req, res) => {
  const { name, email } = req.body;

  const sql = 'INSERT INTO users (name, email) VALUES (?, ?)';
  connection.query(sql, [name, email], (error, results) => {
    if (error) {
      console.error('Error submitting form:', error);
      res.status(500).send('Error submitting form');
    } else {
      console.log('Form submitted successfully');
      res.status(200).send('Form submitted successfully');
    }
  });
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Remember to replace the database connection details with your actual database credentials and adjust the routes and table names as necessary. This is just a basic example to get you started.