Express app.put / app.post outputs null values - node.js

Question

I'm really new to node/express/mongoDB coding, and I have a slight problem with adding/updating values into mongoDB via node/express.
app.post('/', (req, res, next) => {
let data = {
first_value: req.body.first_value,
second_value: req.body.second_value,
};
dbase.collection("testDB").insertOne(data, (err, result) => {
if (err) {
console.log(err);
}
res.send('data added successfully');
});
});
app.put('/:id', (req, res, next) => {
var id = { _id: new ObjectID(req.params.id) };
dbase.collection("testDB").updateOne({ _id: id }, {
$set: {
first_value: req.body.first_value
second_value: req.body.second_value,
}
}, (err, result) => {
if (err) {
throw err;
}
res.send('data updated sucessfully');
});
});
app.put does not alter the values in DB, and app.post only adds "null" into every section of the new entry when I'm trying them with Postman. When I add new values with html form, the data is added correctly.
What is the problem with my code?

Answer 1

For app.post , can you provide me a screen shot of the way you are entering data and in which format e.g. , application/raw , application/x-www-form-urlencoded etc .
For app.put you need to correct the following things . The corrected code is as below ,
app.put('/:id', (req, res, next) => {
var id = { _id: new ObjectID(req.params.id) };
dbase.collection("testDB").updateOne( id , { // put "id" instead of "{ _id: id }"
$set: {
first_value: req.body.first_value
second_value: req.body.second_value,
}
}, (err, result) => {
if (err) {
throw err;
}
res.send('data updated sucessfully');
});
});
Hope you can get the point and this works for you .