How to connect react native and MSSQL server [duplicate]

You need to have REST APIs build using expressjs and then these APIs will be taking to your database using the MySQL library for nodejs and at the end, your react application will talk to REST API.

connect to MySQL like this:

var mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'me',
  password : 'secret',
  database : 'my_db'
});
 
connection.connect();