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Documentation Grafana k6 JavaScript API k6/experimental csv parse( file, [options] )

parse( file, [options] )

The csv.parse function parses an entire CSV file at once and returns a promise that resolves to a SharedArray instance. This function uses Go-based processing, which results in faster parsing and lower memory usage compared to JavaScript alternatives. It’s ideal for scenarios where performance is a priority, and the entire CSV file can be loaded into memory.

Asynchronous Nature

csv.parse is an asynchronous function that returns a Promise. Due to k6’s current limitation with the init context (which doesn’t support asynchronous functions directly), you need to use an asynchronous wrapper like this:

JavaScript

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import { open } from 'k6/experimental/fs';
import csv from 'k6/experimental/csv';

let file;
let csvRecords;
(async function () {
  file = await open('data.csv');
  csvRecords = await csv.parse(file, { delimiter: ',' });
})();

Parameters

Returns

A promise resolving to a SharedArray instance, where each element is an array representing a CSV record, and each sub-element is a field from that record.

Example

JavaScript

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import { open } from 'k6/experimental/fs';
import csv from 'k6/experimental/csv';
import { scenario } from 'k6/execution';

export const options = {
  iterations: 10,
};

let file;
let csvRecords;
(async function () {
  file = await open('data.csv');

  // The `csv.parse` function consumes the entire file at once and returns
  // the parsed records as a `SharedArray` object.
  csvRecords = await csv.parse(file, { skipFirstLine: true });
})();

export default async function () {
  // `csvRecords` is a `SharedArray`. Each element is a record from the CSV file, represented as an array
  // where each element is a field from the CSV record.
  //
  // `csvRecords[scenario.iterationInTest]` gives the record for the current iteration.
  console.log(csvRecords[scenario.iterationInTest]);
}

Notes on Usage

• Memory considerations: csv.parse loads the entire CSV file into memory at once, which may lead to increased memory usage and startup time for very large files.
• Shared memory usage: The SharedArray returned by csv.parse is shared among all Virtual Users (VUs), reducing memory overhead when multiple VUs access the same data.