NODE and SQL Server : transaction commit and rollback - node.js

Question

I'm trying to insert an array of data into a table and this has to be done in a single go. I'm trying to implement a transaction with SQL Server in node js.
I can insert the data successfully, but the issue is whenever there is an error, the transaction is still getting committed. I know my code is not correct, can anyone help me correct my code?
saveStockbulkDetails = async(requestBody, res) => {
var toggle = true;
let dDate = new Date();
let currentDate = moment(dDate).format("YYYY-MM-DD");
const transaction = new sql.Transaction(dbconn1);
transaction.begin((err) => {
const request = new sql.Request(dbconn1);
for (let i = 0; i < requestBody.pipeDetails.length; i++) {
console.log(requestBody.pipeDetails[i].heat);
request.query(
"insert into JSULLCStockDB.dbo.ma_smallpipe_shipping_details(jsuordref, itemno, pipeid, heat, loadtallyno, uid_ent, tmstp_ent, date_ent)" +
" values('" +
requestBody.jsuOrder +
"'," +
"'" +
requestBody.itemNo +
"'," +
"'" +
requestBody.pipeDetails[i].pipeid +
"'," +
"'" +
requestBody.pipeDetails[i].heat +
"'," +
"'" +
requestBody.loadTallyNo +
"'," +
"'" +
requestBody.uid_ent +
"'," +
"getDate()," +
"'" +
currentDate +
"')",
(err, res) => {
if (err) {
transaction.rollback((err) => {
console.log("transaction commit rollback");
});
}
}
);
}
console.log(toggle);
if (toggle) {
transaction.commit((err) => {
if (err) {
console.log("transaction commit error!!");
} else {
console.log("transaction commit success!!");
}
});
}
});
}