Mongodb why FindOne works but Find doesn't?

Question

JavaScript

here is the code

if (req.url === '/login' && req.method === 'POST') {
        console.log('login');
        res.setHeader('content-type','application/json; charset=utf-8');
        res.setHeader('Access-Control-Allow-Origin','*');
        let data = '';
        req.on('data',(dataSumbol) => {
            data+=dataSumbol.toString();
        })
        req.on('end',async () => {
            data = JSON.parse(data);
            let infoBD = await db.find({email:data.email,password:data.password});
            console.log('data',infoBD);
            if (!infoBD) {
                res.end(JSON.stringify({
                  resultCode:1,
                  textErorr:'ivalid login or password',
                }));
                return
            } else {
                res.end(JSON.stringify(infoBD));
            }
        })
        return
    }

rejection text
UnhandledPromiseRejectionWarning: TypeError: Converting circular structure to JSON
--> starting at object with constructor 'NativeTopology'
| property 's' -> object with constructor 'Object'
| property 'sessionPool' -> object with constructor 'ServerSessionPool'

Answer 1

In the condition, check through infoDB.length, because you receive an array and even if it is empty, you will always have true