Check if a user exists node.js mysql - mysql

Question

i have user mysql table with users how to get user exists.
i check user using select user from where access token = .
and check result in node.js server.
app.post("/checkStatusUser", function (request, responce) {
var accessTokenCheck = request.body.accessToken;
console.log(accessTokenCheck);
con.query(
"SELECT * FROM user_token_individual WHERE user_access_token = ?",
[accessTokenCheck],
function (err, res) {
if (err) {
responce.json({
STATUS_CODES: 404,
});
console.log(404);
responce.end();
} else {
if (!res.lenght) {
console.log(res);
responce.json({
STATUS_CODES: 200,
});
console.log(200);
responce.end();
}
console.log(404);
responce.end();
}
}
);
});
I don’t understand how to check if there is a user with such a token.
in res i have two log 200 and 404 because why i dont understand

Answer 1

I'd suggest using the response.status function to indicate status to the user, you can then use response.json to indicate the message. You could also use response.sendStatus if you just want to send text status, this would append a message to the response.
I'd suggest using a 500 status code in the case of an error, this indicates something we didn't expect, this is up to you of course!!
So something like this should work:
app.post("/checkStatusUser", function (request, responce) {
var accessTokenCheck = request.body.accessToken;
console.log(accessTokenCheck);
con.query(
"SELECT * FROM user_token_individual WHERE user_access_token = ?",
[accessTokenCheck],
function (err, res) {
if (err) {
console.error("An error occurred:", err.message);
responce.status(500).json({ status: 500, message: "An error occurred: " + err.message });
} else {
if (res.length) {
console.log( "User found successfully.");
responce.status(200).json({ status: 200, message: "User found successfully." });
} else {
console.log( "User not found.");
responce.status(404).send({ status: 404, message: "User not found." });
}
}
}
)
});