What is the best way to `javascript parse csv` data?

General Discussions
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1

I’m looking for some JavaScript code that can parse CSV data. Where can I find a reliable solution to handle this in JavaScript?

2

I’ve worked with a ton of data-heavy web apps over the years, and when it comes to javascript parse csv, my go-to has always been PapaParse.

Papa.parse(csvData, {
  header: true,
  complete: function(results) {
    console.log(results.data);
  }
});

:pushpin: Why I recommend it:

  • Handles edge cases like quoted fields, custom delimiters, and multi-line entries
  • Streams large files without crashing the browser
  • Works seamlessly in the browser or via Web Workers
3

That’s a solid choice, But in my experience, if you just need something ultra lightweight for quick tasks, there’s value in going manual. I’ve used this tiny snippet for years when I need to quickly javascript parse csv data with no frills.”*

function parseCSV(str) {
  return str.split('\n').map(row => row.split(','));
}

:pushpin: When this works best:

  • No embedded commas or quotes in the data
  • Small files or quick internal tools
  • No need to load external libraries
4

Both of those are great, depending on your needs. But let me take it a step further—what if you’re letting users upload files directly? I’ve implemented this in a few browser-based tools, and javascript parse csv really shines when you combine it with FileReader.”

document.getElementById('csv').addEventListener('change', function(e) {
  const reader = new FileReader();
  reader.onload = function() {
    const rows = reader.result.split('\n').map(line => line.split(','));
    console.log(rows);
  };
  reader.readAsText(e.target.files[0]);
});

:pushpin: Why this approach rocks:

  • Lets users upload actual CSV files
  • Parses the data right in the browser without sending to a server
  • Perfect for lightweight in-browser tools and quick data previews