How to Let Users Download JavaScript Array Data as a CSV on Client-Side?

In this article, we’ll look at how to let users download a JavaScript array’s data as a CSV on the client-side. How to let users download JavaScript array data as a CSV on client-side? We can let generate CSVs from nested arrays on the client-side and let users download them with some JavaScript code.

Sometimes, we may want to let users download a nested array with data as a CSV text file.

In this article, we’ll look at how to let users download a JavaScript array’s data as a CSV on the client-side.

Using the window.open Method

We can use the window.open method to open a URL encoded string to let users download that to their computer.

For instance, we can write:

const rows = [
  ["name1", "new york", "abc"],
  ["name2", "san francisco", "def"]
];
let csvContent = "data:text/csv;charset=utf-8,";
for (const rowArray of rows) {
  const row = rowArray.join(",");
  csvContent += `${row}\r\n`;
}
const encodedUri = encodeURI(csvContent);
window.open(encodedUri);

We have the rows nested array that we want to convert to a CSV string and let users download it.

To do the conversion, we first define the beginning of the csvContent string which specifies the MIME type and the character set.

Then we loop through the rows entries, join each row’s entries and append them to the csvContent string with newline characters.

Then we call encodeURI with the csvContent string to encode it to a URL encoded string.

And finally, we can download the string as a file with window.open .

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