Check if user already exist in MySql database in Node.js
Don't substitute a variable into the SQL, use a placeholder and a parameter array.
const selectUsername = conn.query("SELECT username FROM user WHERE username= ?", [username], function (err, row){
How to check if Email exists , throw error if so , and create user if no match with Sequelize and Express?
You should also give us a log of what found
contains, but with a guess maybe try changing this line:
if (found != "")
to line below:
if (found)
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