Vue.js is a popular framework for creating front end web apps.

In this article, we’ll look at some tips for writing better Vue.js apps.

Force Download with GET Request using Axios

We can make the response always download by passing our response data into the Blob constructor.

For instance, we can write:

axios
  .get(`download-pdf`, {
    responseType: 'arraybuffer'
  })
  .then(response => {
    const blob = new Blob(
      [response.data], 
      { type: 'application/pdf' }
    ),
    const url = window.URL.createObjectURL(blob);
    window.open(url) ;
  })

We make a GET request to the download-pdf endpoint to download our PDF.

We make sure that we specify that the responseType is 'arraybuffer' to indicate that it’s a binary file.

Then in the then callback, we get the response parameter, which has the data we want in the data property.

We pass that into the Blob constructor in an array.

And we specify the MIME type of the response data.

Then we create the URL that lets us download the file with createObjectURL .

Finally, we call window.open with the url to download the file.

We can also specify the file name of the downloaded file by making a small change in the then callback.

To do that, we write:

axios
  .get(`download-pdf`, {
    responseType: 'arraybuffer'
  })
  .then(response => {
    const blob = new Blob(
      [response.data], 
      { type: 'application/pdf' }
    ),
    const link = document.createElement('a');
    link.href = window.URL.createObjectURL(blob);
    link.download = "file.pdf";
    link.click();
  })

Instead of creating an object URL directly, we create an invisible link first and set the file name as the download property of it.

Then we call click to download it.

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