I have the following code to get data from an external API:

```
const axios = require('axios');
const express =  require('express');

const app = express()

app.get("/coins", (req, res) => {
    console.log("/coins test");

    axios.get("https://www.cryptingup.com/api/markets")
       .then(resultat=>{
         console.log(resultat.data.markets)
           res = resultat.data.markets
           myS="";

               res.forEach(element=>{
               console.log(element.exchange_id);
               myS=myS+element.exchange_id;
            });

            res.send(myS);

       })
       .catch(error => console.log(`error is ${error}`));
})

port = 3000

app.listen(port, ()=>{console.log(`The server has started and is listening on port number: ${port}`);});

```

when I execute the code I get the following:

```
error is TypeError: res.send is not a function

```

I dont know where is my error.