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Setting baseURL in default configuration

Fresh5 days ago
Mar 14, 20260 views
Confidence Score55%
55%

Problem

In some cases my app requires different defaults from the standard ones, and I've been dealing with this by putting something like this in the app's entry point: [code block] My tests are run in Node and I want to override the `baseURL` so that axios will work with Nock even with relative URLs, but the code above doesn't work. Would it be reasonable to add this parameter to the defaultConfig when instantiating Axios? Or is there a better way I should be doing this? I have an example of what I mean here.

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1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Override baseURL in Axios Default Configuration

Medium Risk

The issue arises because the default Axios configuration does not allow for dynamic changes to the `baseURL` after instantiation, which is necessary for testing environments where Nock is used to mock HTTP requests. This leads to failures when relative URLs are used without a proper base URL.

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  1. 1

    Install Axios and Nock

    Ensure that both Axios and Nock are installed in your project to handle HTTP requests and mocking respectively.

    bash
    npm install axios nock
  2. 2

    Create a Custom Axios Instance

    Instead of using the default Axios instance, create a custom instance where you can set the `baseURL` dynamically based on your environment (e.g., testing).

    javascript
    const axios = require('axios');
const axiosInstance = axios.create({
  baseURL: process.env.BASE_URL || 'http://localhost'
});
  3. 3

    Set BASE_URL in Test Environment

    Before running your tests, set the `BASE_URL` environment variable to the desired base URL that Nock will intercept. This allows you to use relative URLs in your Axios requests.

    bash
    export BASE_URL=http://mockapi.com
  4. 4

    Use Custom Axios Instance in Tests

    Replace all instances of the default Axios calls in your tests with the custom instance you created. This ensures that the overridden `baseURL` is used.

    javascript
    const response = await axiosInstance.get('/endpoint');
  5. 5

    Run Tests and Verify

    Execute your tests to ensure that they pass with the new configuration. Check that Nock is intercepting the requests correctly and that the responses are as expected.

    bash
    npm test

Validation

Confirm that all tests pass without errors related to Axios requests. Additionally, verify that the requests are being intercepted by Nock and that the correct responses are returned.

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Environment

Submitted by

AC

Alex Chen

2450 rep

Tags

axioshttpapi