Nestjs HttpService error handling with AxiosRequestConfig's validateStatus function - node.js

Question

I need to handle http errors status code (such as 401, 500, etc) which can occur when consuming an external service using HttpService (HttpModule of Nestjs). Here is the implementation i am working on:
import { Injectable } from '#nestjs/common';
import { HttpService } from '#nestjs/axios';
import { Logger } from '#nestjs/common';
import { AxiosRequestConfig } from 'axios';
import { catchError, firstValueFrom, map } from 'rxjs';
type Person = {
name: string;
lastName: string;
};
#Injectable()
export class PersonService {
constructor(private httpService: HttpService) {}
async findPerson(): Promise<Person> {
const axiosConfig: AxiosRequestConfig = {
method: 'get',
url: 'https://service.dns/path/person',
headers: {
'Content-Type': 'application/json',
Authorization: `Bearer ${jwt}`,
},
validateStatus: function (status: number) {
return status === 200;
},
};
const personInstance: Person = await firstValueFrom(
this.httpService.request(axiosConfig).pipe(
catchError((e) => {
Logger.error(e.response.data.errorMessage);
throw new Error('internal communication error');
}),
map((res) => {
return res.data;
}),
),
);
return personInstance;
}
}
In the code above, I just need the function catchError throws the custom error, but I am not able to make the function validateStatus to trigger the execution of catchError.

Answer 1

I have implemented next code in order to take advantage of validateStatus function of AxiosRequestConfig for giving solution to my needs:
import { Injectable } from '#nestjs/common';
import { HttpService } from '#nestjs/axios';
import { Logger } from '#nestjs/common';
import { AxiosRequestConfig } from 'axios';
import { firstValueFrom } from 'rxjs';
type Person = {
name: string;
lastName: string;
};
#Injectable()
export class PersonService {
constructor(private httpService: HttpService) {}
async findPerson(): Promise<Person> {
const axiosConfig: AxiosRequestConfig = {
method: 'get',
url: 'https://service.dns/path/person',
headers: {
'Content-Type': 'application/json',
Authorization: `Bearer fake_jwt`,
},
validateStatus: function (status: number) {
return status === 200;
},
};
return firstValueFrom(this.httpService.request(axiosConfig))
.then((res) => res.data)
.catch((e) => {
Logger.error(e.errorMessage);
throw new Error('internal communication error');
});
}
}
Note: this code deals with Promise<AxiosResponse<any>> instead of Observable<AxiosResponse<any> methods