Ravikumar Raman

Introduction One of the ideas in JavaScript that I think most beginners struggle with is asynchronous programming. I struggled to understand it as well. It took some time for me to finally grasp this notion, despite the fact that I saw a number of tutorials and read a lot about it. In order to make asynchronous JavaScript easy to comprehend for novices, I will do my best to describe it in this essay.   JavaScript is a single-threaded programming language which means only one thing can happen at a time. That is, the JavaScript engine can only process one statement at a time in a single thread. While the single-threaded languages simplify writing code because you don’t have to worry about the concurrency issues, this also means you can’t perform long operations such as network access without blocking the main thread. Imagine requesting some data from an API. Depending upon the situation the server might take some time to process the request while blocking the main thread ...

This blog explains you how we can convert a JSON  from an uploaded Excel file to the browser.  Please follow the below steps to covert excel to json The first thing is getting the excel file from the user. We can do it using the  <input>  tag in HTML. It shows below. ( <input type=”file” id=”fileUploader” name=”fileUploader” accept=”.xls, .xlsx”/> ) Next we have to define what we are going to do when user upload the file. For that we are going to use the  change  event of the element above.   This is the important part. Now we are going to define what we want to do with the file uploaded. First, we have to read the file uploaded. In here we make an assumption that the user only uploading a one file. Next we are going to read that file data using a  FileReader.  From this FileReader we can read the data in our excel file as a binary string. Then we use  XLSX  which an inbuilt facility of  SheetJS js-xls...