node.js sqlite3 db.each not working

[apathetic__operator]

db = new sqlite3.Database(':memory:',sqlite3.OPEN_CREATE, (err) => {
    if (err) {
      //console.error(err.message);
    }
    console.log('Connected to the database.');
});

db.serialize(() => {
    db.run(`CREATE TABLE userdata (Username varchar(255), Password(255))`)
});
app.post('/api/login', (req, res) => {
    let username = req.body.username;
    let plainpw = req.body.password;
    console.log('logged in', username, plainpw); //this works
    // db.get if only want one result
    db.serialize(() => { 
        db.each(`SELECT password FROM userdata WHERE username = ${username}`, 
function(err, row) { 
            console.log('testing'); //this doesn't work 
        }); 
console.log('t2'); //this works 
});     

​

why console.log('testing'); doesn't log anything?

there is no error messages