Stay DRY Using axios for API Requests

Installation and the basics

It can be installed using npm (or yarn):

npm install axios

An independent POST request using Axios looks like this:

axios.post(‘https://axios-app.firebaseio.com/users.json’, formData)
  .then(res => console.log(res))
  .catch(error => console.log(error))

Native JavaScript has multiple ways of doing JavaScript too. Notably, fetch() . So why use a library at all? Well, for one, error handling in fetch is pretty wonky. You’ll have a better time with axios right out of the gate with that. If you’d like to see a comparison, we have an article that covers both and an article that talks about the value of abstraction with stuff like this.

Another reason to reach for axios? It gives us more opportunities for DRYness, so let’s look into that. 

Global config

We can set up a global configuration (e.g. in our main.js file) that handles all application requests using a standard configuration that is set through a default object that ships with axios. 

This object contains:

• baseURL: A relative URL that acts as a prefix to all requests, and each request can append the URL
• хедерs: Custom хедерs that can be set based on the requests
• timeout: The point at which the request is aborted, usually measured in milliseconds. The default value is 0, meaning it’s not applicable.
• withCredentials: Indicates whether or not cross-site Access-Control requests should be made using credentials. The default is false.
• responseType: Indicates the type of data that the server will return, with options including json (default), arraybuffer, document, text, and stream.
• responseEncoding: Indicates encoding to use for decoding responses. The default value is utf8.
• xsrfCookieName: The name of the cookie to use as a value for XSRF token, the default value is XSRF-TOKEN.
• xsrfHeaderName: The name of the HTTP хедер that carries the XSRF token value. The default value is X-XSRF-TOKEN.
• maxContentLength: Defines the max size of the HTTP response content in bytes allowed
• maxBodyLength: Defines the max size of the HTTP request content in bytes allowed

Most of time, you’ll only be using baseURL, хедер, and maybe timeout. The rest of them are less frequently needed as they have smart defaults, but it’s nice to know there are there in case you need to fix up requests.

This is the DRYness at work. For each request, we don’t have to repeat the baseURL of our API or repeat important хедерs that we might need on every request. 

Here’s an example where our API has a base, but it also has multiple different endpoints. First, we set up some defaults:

// main.js
import axios from ‘axios’;


axios.defaults.baseURL = ‘https://axios-app.firebaseio.com’ // the prefix of the URL
axios.defaults.хедерs.get[‘Accept’] = ‘application/json’   // default хедер for all get request
axios.defaults.хедерs.post[‘Accept’] = ‘application/json’  // default хедер for all POST request


Then, in a component, we can use axios more succinctly, not needing to set those хедерs, but still having an opportunity to customize the final URL endpoint:


// form.js component
import axios from ‘axios’;


export default {
  methods : {
    onSubmit () {
      // The URL is now https://axios-app.firebaseio.com/users.json
      axios.post(‘/users.json’, formData)
        .then(res => console.log(res))
        .catch(error => console.log(error))
    }
  }
}

Note: This example is in Vue, but the concept extends to any JavaScript situation.

Custom instance

Setting up a “custom instance” is similar to a global config, but scoped to specified components. So, it’s still a DRY technique, but with hierarchy. 

We’ll set up our custom instance in a new file (let’s call it authAxios.js) and import it into the “concern” components.

// authAxios.js
import axios from ‘axios’


const customInstance = axios.create ({
  baseURL : ‘https://axios-app.firebaseio.com’
})
customInstance.defaults.хедерs.post[‘Accept’] = ‘application/json’


// Or like this…
const customInstance = axios.create ({
  baseURL : ‘https://axios-app.firebaseio.com’,
  хедерs: {‘Accept’: ‘application/json’}
})

And then we import this file into the form components:

// form.js component


// import from our custom instance
import axios from ‘./authAxios’


export default {
  methods : {
    onSubmit () {
      axios.post(‘/users.json’, formData)
      .then(res => console.log(res))
      .catch(error => console.log(error))
    }
  }
}

In this guide, you will learn how to design and launch a custom JavaScript API from scratch, sell it, and turn it into a profitable venture.

APIRapidAPI

Mashhood A.

Logging Errors

Finally, we can use these properties to log errors properly. It will look like this in code:

jsCopytry{const res =await axios.get(`https://famous-quotes4.p.rapidapi.com/random`);}catch(error){if(error.response){// Request made but the server responded with an error console.log(error.response.data); console.log(error.response.status); console.log(error.response.хедерs);}elseif(error.request){// Request made but no response is received from the server. console.log(error.request);}else{// Error occured while setting up the request console.log(‘Error’, error.message);}}

Now you know how to manage API errors using Axios. Find a suitable API from RapidAPI Hub and integrate it into your projects using Axios.

api# axios# errors#

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