You can not find the Get method in Node.JS

I have the following code on my Node.JS server that queries a database:

              if(response.context.rfc){
                var valorRFC = response.context.rfc;
                connection.query('SELECT * FROM pruebas.Usuarios2 where RFC = '${valorRFC}'', function (err, result, fields) {
                      if (result.length > 0) {

                app.get('/bd/', (req, res)=>{
                        res.json("jeje");
                 });

                    } else {
                      console.log("No login");
                    }
              });
            }

This result is from my JavaScript file with the following fetch:

if(response.context.rfc){
    fetch('/bd/').then(r => r.json())
    .then(data => {
         console.log(data);
        }).catch(err => {
      });  
    }
};

But I get the following error in the JavaScript console:

  

script.js: 33 GET link 404 (Not Found)

Do you know how I can fix it?