slew

Loading big data files in the browser can be a pain. Slew is here to help, providing streaming loaders for CSV and JSON data. Just add the included bundle.js or bundle.min.js to your document's head:

<script src="bundle.min.js"></script>

You can also link directly to the Browserify CDN-hosted build at: https://wzrd.in/standalone/slew@latest

slew.csv(url, [options,] callback)

Streams CSV row-by-row with csv-parser, providing a stream to the callback function. The optional options object allows you to set parsing parameters, such as separator and newline.

slew.csv("path/to/data.csv", function(stream) {
  var rows = [];
  stream
    .on("data", function(row) {
      rows.push(row);
    })
    .on("end", function() {
      console.log("all done!");
    });
});

slew.json(url, [path,] callback)

Streams JSON, emitting a data event whenever the optional JSONStream path is matched in the output:

/*
 * e.g., if your data looks like:
 * { results: [ ... ] }
 */
slew.json("path/to/data.json", "results.*", function(stream) {
  var rows = [];
  stream
    .on("data", function(row) {
      rows.push(row);
    })
    .on("end", function() {
      console.log("all done!");
    });
});

Coming soon: line-delimited JSON!