Access Denied for MySql Connection in Nodejs

Question

please i'm using expressjs in nodejs. Am actually new to nodejs.

Am trying to connect to mysql with the my usual credentials but i get the following errors.

Please help me out. Thank you.

"C:\Program Files (x86)\JetBrains\IntelliJ IDEA 15.0\bin\runnerw.exe" "C:\Program Files\nodejs\node.exe" bin\www
Tue, 08 Dec 2015 21:39:57 GMT NodeApp:server Listening on port 3306
c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\protocol\Parser.js:82
        throw err;
        ^

Error: ER_ACCESS_DENIED_ERROR: Access denied for user ''@'localhost' (using password: YES)
    at Handshake.Sequence._packetToError (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\protocol\sequences\Sequence.js:48:14)
    at Handshake.ErrorPacket (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\protocol\sequences\Handshake.js:101:18)
    at Protocol._parsePacket (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\protocol\Protocol.js:274:23)
    at Parser.write (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\protocol\Parser.js:77:12)
    at Protocol.write (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\protocol\Protocol.js:39:16)
    at Socket.<anonymous> (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\Connection.js:96:28)
    at emitOne (events.js:77:13)
    at Socket.emit (events.js:169:7)
    at readableAddChunk (_stream_readable.js:146:16)
    at Socket.Readable.push (_stream_readable.js:110:10)
    --------------------
    at Protocol._enqueue (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\protocol\Protocol.js:135:48)
    at Protocol.handshake (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\protocol\Protocol.js:52:41)
    at Connection.connect (c:\Users\John\IdeaProjects\NodeApp\node_modules\mysql\lib\Connection.js:123:18)
    at Object.<anonymous> (c:\Users\John\IdeaProjects\NodeApp\routes\about.js:16:12)
    at Module._compile (module.js:435:26)
    at Object.Module._extensions..js (module.js:442:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Module.require (module.js:366:17)
    at require (module.js:385:17)

Process finished with exit code 1

Answer 1

As shown in the readme you should use user instead of username :

var mysql = require('mysql');

var connection = mysql.createConnection({
    host : 'localhost',
    user : 'root',
    password : 'password',
    database : 'db_name'
})

connection.connect();

Answer 2

for user : and password : please write them all in small letter if any of the letter of the mentioned captions( user and password) becomes uppercase it will display the error 'ER_ACCESS_DENIED_ERROR: Access denied for user ''@'localhost' (using password: YES)' on the contrary, Host and database is not case sensitive

Host     : 'localhost',
user     : 'user_username',// if you create a user otherwise use 'root'
Database : 'the database',
password : 'your password',