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@fast-csv/parse

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@fast-csv/parse

fast-csv parsing package

  • 5.0.2
  • latest
  • Source
  • npm
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What is @fast-csv/parse?

@fast-csv/parse is a powerful and flexible CSV parsing library for Node.js. It allows you to read and parse CSV files or strings with ease, providing a variety of options to handle different CSV formats and use cases.

What are @fast-csv/parse's main functionalities?

Parsing CSV from a file

This feature allows you to parse a CSV file from the file system. The `headers: true` option indicates that the first row of the CSV file contains headers.

const fs = require('fs');
const { parse } = require('@fast-csv/parse');

fs.createReadStream('path/to/your.csv')
  .pipe(parse({ headers: true }))
  .on('data', row => console.log(row))
  .on('end', rowCount => console.log(`Parsed ${rowCount} rows`));

Parsing CSV from a string

This feature allows you to parse a CSV string directly. The `headers: true` option indicates that the first row of the CSV string contains headers.

const { parseString } = require('@fast-csv/parse');

const csvString = 'header1,header2\nvalue1,value2\nvalue3,value4';

parseString(csvString, { headers: true })
  .on('data', row => console.log(row))
  .on('end', rowCount => console.log(`Parsed ${rowCount} rows`));

Handling different delimiters

This feature allows you to parse CSV data with a custom delimiter. In this example, the delimiter is set to a semicolon (`;`).

const { parseString } = require('@fast-csv/parse');

const csvString = 'header1;header2\nvalue1;value2\nvalue3;value4';

parseString(csvString, { headers: true, delimiter: ';' })
  .on('data', row => console.log(row))
  .on('end', rowCount => console.log(`Parsed ${rowCount} rows`));

Transforming data during parsing

This feature allows you to transform data during parsing. The `transform` function is applied to each row, allowing you to modify the data as it is being parsed.

const { parse } = require('@fast-csv/parse');

const transform = (row) => {
  return {
    ...row,
    transformed: true
  };
};

parse({ headers: true, transform })
  .on('data', row => console.log(row))
  .on('end', rowCount => console.log(`Parsed ${rowCount} rows`));

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Package last updated on 22 Oct 2024

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