Store data from online form in sql database

I am trying to save data from a form in a sql database. The form is written in html / js, running locally on an express server. The sql database is on aws.

I create a connection to the db like this:

var connection = mysql.createConnection({ 
     host: 'endpoint from connectivity tab', 
     port: '3306', 
     user: 'admin', 
     password: 'master pw' 

When I submit the form, though, a red error on the top of the browser displays Error: ER_NO_DB_ERROR: No database selected. When I add the database identifier name from RDS > Databases > database identifier such as

var connection = mysql.createConnection({ 
     host: 'endpoint from connectivity tab', 
     port: '3306', 
     user: 'admin', 
     password: 'master pw', 
     database: 'database identifier' 

and then run npm start, though, I receive an error in my terminal that says errno: 1049 sqlMessage: "Unknown database 'database identifier' " obviously with my identifier as the actual name. My db is publically accessible.

Also, on VPC I created an Inbound Rule which allows all connections from anywhere to the db.

Am I going about saving data to a sql db in the right way?