In your Angular service, use the HttpClient to make a GET or POST request. Crucially, set the responseType to 'blob' . How to download files in Angular - CoreUI
To download a file from an API as a byte array in Angular, you must configure the HttpClient to expect a response rather than the default JSON. This approach converts the incoming byte stream into a binary object that the browser can save as a physical file. 1. Configure the Angular Service angular download file from api byte array