Inserting data into a database using node js mysql

ow yes I forgot.

cartAdd(){
var dataToSend = {
order_id:2,name:“kota”,price:57.96,qty:2,totalAmt:78
};
var url =“http://localhost:4000/add”;
this.http.post(url,{data:JSON.stringify(dataToSend)},{headers:new HttpHeaders(
{“content-Type”:“application/json”}
)}).subscribe(
(data)=>{
alert(data);
}
)
}