How to save connection result in a variable in Node.js ? Last Updated : 07 Apr, 2021 Comments Improve Suggest changes Like Article Like Report We are going to use the query function in MySQL library in node.js that will return our output as expected. Using this approach, we can save connection result in a variable in Node.js. Setting up environment and Execution: Step 1: Initialize node project using the following command. npm init Step 2: Turn on MySQL Database Step 3: After creating the NodeJS application, Install the mysql module using the following command. npm install mysql Database Table: Our sample gfg_table database with look like this. Step 4: Create an index.js file with the following code. index.js const mysql = require("mysql"); var db_con = mysql.createConnection({ host: "localhost", user: "root", password: "", database: "gfg_db" }); let output; const setOutput = (rows) => { output = rows; console.log(output); } db_con.connect(async(err) => { if (err) { console.log("Database Connection Failed !!!", err); return; } console.log("Connected to Database"); let query = 'SELECT * FROM users'; db_con.query(query, (err, rows) => { if (err) { console.log("internal error", err); return; } // This is the important function setOutput(rows); }); }); Step 5: Run the index.js file using the following command. node index.js Output: Comment More infoAdvertise with us Next Article How to save connection result in a variable in Node.js ? P pratikraut0000 Follow Improve Article Tags : Web Technologies Node.js Node.js-Methods NodeJS-Questions NodeJS-MySQL +1 More Similar Reads How to Properly Reuse Connection to MongoDB Across NodeJs Efficiently managing database connections is important for Node.js applications using MongoDB. MongoDB connection reuse in Node.js is a practice that optimizes resource utilization and enhances application performance. By reusing connections, developers can reduce the overhead associated with establ 6 min read How to Use Connection Pooling with MySQL in Node.js? MySQL is one of the most preferred relational databases, While Node.js is another name for JavaScript runtime environment. While assessing a large number of connections in the database in a Node. In this regard, effectiveness in managing them is also a significant determinant when developing and mai 3 min read How to Push Data to Array Asynchronously & Save It in Node.js ? 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