How to execute large SQL statement - sql

Question

I'm trying to extract data from a MongoDb database and insert them into a SQL Server table, via a NodeJS program.
However, when I run it, it gives me almost 1 million lines and a huge SQL statement (with multiple "INSERT INTO", one for each row to avoid any limit) but it doesn't update my table.
I also tried to save the whole query in a text file and import it as a script in SSMS, but the file is too big (~300 mo) so SSMS is crashing.
What can I do? How can I maybe divide my query into smaller batches (like each 100 000 records) or pause it?
Here's my code :
var sql = require('mssql');
const fs = require('fs');
var config = { user: 'xxxxxx',
password: 'xxxxx',
server: 'xxxxx',
database: 'xxxx',
stream: true,
requestTimeout: 2000000,
};
exports.insertElementsInSql = function(elements, callback) {
let dateStr = new Date().toISOString().slice(0, 10);
sql.connect(config, function(err, conn) {
if (err) {
callback(err);
} else {
var request = new sql.Request();
request.stream = true;
var query = "";
var count=0;
query = query + "SET ANSI_WARNINGS OFF;";
query = query + "DELETE FROM [xxxx].[dbo].[xxxxx];";
for(var i in elements){
query = query + "INSERT INTO [xxxx].[dbo].[xxxxx] VALUES ";
query = query +"('" + dateStr + "'";
query = query + ",'"+elements[i].OrgaCode+ "'";
query = query + ","+elements[i].nbWidgets;
query = query + ","+elements[i].nbTabs;
query = query + ",'"+elements[i].Segment+ "'";
query = query + ",'"+elements[i].SitesList+ "'";
query = query + ",'"+elements[i].Columns+ "'";
query = query + ") ";
count++;
};
query = query + "SET ANSI_WARNINGS ON;";
console.log(query);
console.log("The query INSERT INTO is complete. Nb of lines : "+count);
fs.writeFile('request.txt', query, (err) => {
if (err) throw err;
console.log('Query saved!');
});
request.query(query, function(err, results) {
if (err) {
console.log("Failure ");
console.log(err);
callback(err);
} else {
callback(null);
console.log("Yay");
}
});
}
});
};
I get :
The query INSERT INTO is complete. Nb of lines: 919045
Thanks for any help!