How to get request query parameters in interceptor - nestjs

Question

I am developing a Nest.js project.
I have a interceptor which simply logs request parameters:
#Injectable()
export class MyRequestInterceptor implements NestInterceptor {
constructor(private logger: MyLogger) {}
intercept(context: ExecutionContext, next: CallHandler): Observable<string> {
const http = context.switchToHttp();
const request = http.getRequest();
const params = request.params;
// output is {}, no parameters showing
this.logger.info(JSON.stringify(params));
return next.handle()
}
}
When I send request GET http://localhost:9001/data?foo=1,2, I expect to see log for foo=1,2 but I see empty object {}. So, where am I wrong? How to access query parameters of request in Nest.js interceptor?

Answer 1

Try request.query
#Injectable()
export class MyRequestInterceptor implements NestInterceptor {
constructor(private logger: MyLogger) {}
intercept(context: ExecutionContext, next: CallHandler): Observable<string> {
const http = context.switchToHttp();
const request = http.getRequest();
const query = request.query;
this.logger.info(JSON.stringify(query));
return next.handle()
}
}

Answer 2

example log interceptor
#Injectable()
export class LogRequestInterceptor implements NestInterceptor {
constructor(
) { }
async intercept(context: ExecutionContext, next: CallHandler<any>): Promise<Observable<any>> {
const http = context.switchToHttp();
const request = http.getRequest();
const id = v4();
const { params, query, body, headers, user } = request;
const { url, method } = request.raw;
console.log('___________________________________________________________________________');
console.log('url : ', url);
console.log('method : ', method);
console.log('params : ', params);
console.log('query : ', query);
console.log('body : ', body);
console.log('headers : ', headers);
console.log('id : ', id);
// const message = { id, type: 'request', method, url, params, query, body, headers, user: (user || {}) };
// this.logger.log(message);
return next.handle()
.pipe(tap(data => {
}),
catchError(err => {
const { message: error, status, stack } = err;
const errorMessage = {
id, type: 'error', method, url, params, query, body, headers,
user: (user || {})._id, data: { error, status, stack },
};
console.log('err', err);
return throwError(err);
}));
}
}