I'm creating a NodeJS backend using Express, and I'm getting the following error:
`Uncaught TypeError: Cannot read properties of undefined (reading 'id')`

My code of where this error is happening is as follows:
```
app.delete('/post', (req, res) => {
    const user = getUser(req.user.user_id);
    if (!user) return res.sendStatus(401);
    const post = getPost(req.body.id);
    if (!post) return res.sendStatus(404);
    if (post.user_id != req.user.user_id) return res.sendStatus(403);
    // Code that deletes the post through DB
    return res.sendStatus(201);
});
```

What are ways I can fix this error?
The error Uncaught TypeError: Cannot read properties of undefined (reading 'id') is likely occurring because req.body.id is undefined. To resolve this error, you should add a check to verify that req.body.id exists before trying to access its properties.

You can do this by adding a conditional statement before accessing req.body.id:

'''
app.delete('/post', (req, res) => {
    const user = getUser(req.user.user_id);
    if (!user) return res.sendStatus(401);
    if (!req.body.id) return res.sendStatus(400);
    const post = getPost(req.body.id);
    if (!post) return res.sendStatus(404);
    if (post.user_id != req.user.user_id) return res.sendStatus(403);
    // Code that deletes the post through DB
    return res.sendStatus(201);
});
'''

This way, if req.body.id is undefined, the code will return a status of 400 Bad Request instead of attempting to access undefined properties.
Thank you that was very helpful!
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