not able to get json response from nestjs route handler - nestjs

Question

Why I am not getting the desired output as i given in res variable for returning from this route
#Get('/signout')
signOut(#Session() session: any) {
session.userId = null;
let res = JSON.parse(
JSON.stringify({
status: 'success',
}),
);
console.log( "--> ", res);
if (!session.userId) {
return res;
}
}
i am getting empty json object as response
{}
i tried printing out my res var it outputs fine.

Answer 1

To help debug your code have you tried just returning the response without any logic ?
#Get('/signout')
signOut(#Session() session: any) {
const res = {
status: 'success',
}
console.log( "--> ", JSON.stringify(res));
return res;
}
and then try
#Get('/signout')
signOut(#Session() session: any) {
session.userId = null;
const res = {
status: 'success',
};
console.log( "--> ", JSON.stringify(res));
if (!session.userId) {
return res;
} else {
throw new HttpException('Error', 500);
}
}

Answer 2

json response can be generated with two ways in NestJs, either use response object of express Response, or just add a header on the top of route handler method
Solution with applying header;
#Get('/')
#Header('Content-type', 'application/json')
handleGet(){
return JSON.stringify({ status : "success"})
}
Solution with using response imported from Express.
#Get('/')
#Header('Content-type', 'application/json')
handleGet(#Response() res : Response){
return res.json({ status : "success"});
}
These are the two possible ways that i found to return JSON response from a route handler method. further if all your responses need to be JSON, you may create an interceptor to alter your response before it is sent