Node JS get request body length

Question

I need to get the length of a field in req.body. But using req.body.username.length <= 5 I got error Cannot read property 'length' of undefined. How can I do it?

Answer 1

Consider that objects don't has property length in JavaScript. For this purpose you can use this code instead.

Object.keys(req.body).length

Object.keys(req.body) will return an array of all keys. So, we can simply get the length of an array with .length.