We have a method res.json to send file in NodeJs but what would happen if we send a json file using res.send. What will be the consequences and why should we avoid doing this thing?

>Solution :

I assume you are talking about ExpressJS:

Whenever an Express application server receives an HTTP request, it will provide the developer with an object, commonly referred to as res. For example,

Example

app.get('/test', (req, res) => {
   // use req and res here
})

The res object basically refers to the response that’ll be sent out as part of this API call.

res.send:

The res.send function sets the content type to text/Html which means that the client will now treat it as text. It then returns the response to the client.

res.json:

The res.json function on the other handsets the content-type header to application/JSON so that the client treats the response string as a valid JSON object. It also then returns the response to the client.

conclusion:

With res.send you have to take care of converting it to a JSON object if needed, whereas with res.json this is done automatically.