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nodejs read csv line by line

barisx answered on August 22, 2022 Popularity 6/10 Helpfulness 2/10

answer nodejs read csv line by line

nodejs read csv line by line

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const { EOL } = require('os');
const { parse } = require('fast-csv');

const CSV_STRING = [
    'firstName,lastName',
    'bob,yukon',
    'sally,yukon',
    'timmy,yukon',
].join(EOL);

const stream = parse({ headers: true })
    .transform((data, cb) => {
        setImmediate(() => cb(null, {
            firstName: data.firstName.toUpperCase(),
            lastName: data.lastName.toUpperCase(),
            properName: `${data.firstName} ${data.lastName}`,
        }));
    })
    .on('error', error => console.error(error))
    .on('data', row => console.log(JSON.stringify(row)))
    .on('end', rowCount => console.log(`Parsed ${rowCount} rows`));

stream.write(CSV_STRING);
stream.end();

Popularity 6/10 Helpfulness 2/10 Language javascript

Source: c2fo.github.io

Tags: csv javascript line-by-line

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Contributed on Aug 22 2022

barisx

0 Answers Avg Quality 2/10

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nodejs read csv line by line

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import { EOL } from 'os';
import { parse } from '@fast-csv/parse';

const CSV_STRING = [
    'firstName,lastName',
    'bob,yukon',
    'sally,yukon',
    'timmy,yukon',
].join(EOL);

type UserRow = {
    firstName: string;
    lastName: string;
};

type TransformedUserRow = UserRow & {
    properName: string;
};

const stream = parse<UserRow, TransformedUserRow>({ headers: true })
    .transform((data, cb): void => {
        setImmediate(() =>
            cb(null, {
                firstName: data.firstName.toUpperCase(),
                lastName: data.lastName.toUpperCase(),
                properName: `${data.firstName} ${data.lastName}`,
            }),
        );
    })
    .on('error', error => console.error(error))
    .on('data', row => console.log(JSON.stringify(row)))
    .on('end', (rowCount: number) => console.log(`Parsed ${rowCount} rows`));

stream.write(CSV_STRING);
stream.end();

Popularity 6/10 Helpfulness 1/10 Language typescript

Source: c2fo.github.io

Tags: csv typescript line-by-line typ

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Contributed on Aug 22 2022

barisx

0 Answers Avg Quality 2/10

nodejs read csv line by line

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