Trouble in pass string parameter from typescript to nodejs

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Typescript

Node.js

i have this ts code to add brand to database table:

add_brand(bDesc,captionid){
     console.log(bDesc);     ***print correct value***
     this.http.post("http://localhost:3000/add_Brand",{bDesc,captionid}).subscribe(
     (res) => {
       console.log("record INSERTEDw");                                             //working True
       this.table.renderRows();
     },
     (error) => {console.log(error)}
     );
}

and in nodejs recive parameters from above ts code:

const bodyParser=require('body-parser');


app.post("/add_brand",(req,res)=>{
    console.log(req.body.bdesc);                        ***print undefined***
    const insertquery="INSERT INTO brandtbl (BDesc,CaptionCode) VALUES ('" + req.body.bdesc + "'," + req.body.captionid + ")";
    
    ConnectToDB().query(insertquery,(err,result)=>{

       if (err){
           console.log("error"+err);
           res.sendStatus(500); 
           return;
       }
       else{
       console.log("record inserted");
       res.end();}
   })
});

but for bDesc i recive undefined value ,how to change to recive string correct value?

What I have tried:

Quote:

this.http.post("http://localhost:3000/add_Brand",{bDesc,captionid}).subscribe