Create a TCP connection with SSL certificates when using Node.js

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Open a TCP connection to Cloud SQL for MySQL by using the Node.js npm mysql module with SSL (Secure Sockets Layer) certificates.

Code sample


const mysql = require('promise-mysql');
const fs = require('fs');

// createTcpPool initializes a TCP connection pool for a Cloud SQL
// instance of MySQL.
const createTcpPool = async config => {
  // Note: Saving credentials in environment variables is convenient, but not
  // secure - consider a more secure solution such as
  // Cloud Secret Manager ( to help
  // keep secrets safe.
  const dbConfig = {
    host: process.env.INSTANCE_HOST, // e.g. ''
    port: process.env.DB_PORT, // e.g. '3306'
    user: process.env.DB_USER, // e.g. 'my-db-user'
    password: process.env.DB_PASS, // e.g. 'my-db-password'
    database: process.env.DB_NAME, // e.g. 'my-database'
    // ... Specify additional properties here.

  // (OPTIONAL) Configure SSL certificates
  // For deployments that connect directly to a Cloud SQL instance without
  // using the Cloud SQL Proxy, configuring SSL certificates will ensure the
  // connection is encrypted.
  if (process.env.DB_ROOT_CERT) {
    dbConfig.ssl = {
      sslmode: 'verify-full',
      ca: fs.readFileSync(process.env.DB_ROOT_CERT), // e.g., '/path/to/my/server-ca.pem'
      key: fs.readFileSync(process.env.DB_KEY), // e.g. '/path/to/my/client-key.pem'
      cert: fs.readFileSync(process.env.DB_CERT), // e.g. '/path/to/my/client-cert.pem'

  // Establish a connection to the database.
  return mysql.createPool(dbConfig);

What's next

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