We calculated the location of a column using a combination of the tr, awk, grep, and nlcommands.įirst, we converted the commas in the header line into line-breaks using the tr command. This script takes col_b as input from the user, and prints the corresponding column value for every record in the file. Read -p "Enter the column name to be printed for each record: " col_b We’ll illustrate this with a simple user-input-driven script: #! /bin/bash const input = fs.createReadStream("./csvsample.csv") Ĭonst rl = readline.There can be situations where we might need to parse the values from CSV based on column names in the header line. To create a readable steam, use `rl.createInterface()` and pass the CSV sample data as the input. In your readCSV2.js file, add the following code to import the fs and the readline module const fs = require("fs"), The readLine module provides an interface for reading data line by line. This can be avoided by reading the file line by line. Sooner or later, you will run out of memory. You may have noticed the shortcoming of reading the entire CSV file at once. READ: How Node.js setTimeout works Method-2: Read the CSV File Line by Line You can choose to generate your own or copy the following. We will be using mockaroo to generate some random data. npm init -yĬreate a new file and call it, `csvsample.csv`.This will be the file containing the CSV sample data. Start by initializing your NodeJs project by generating a package.json file by running the following command. To better understand this article and follow along with the example, you should have prior knowledge of JavaScript concepts and at least Node 8 installed. By the end, you will be able to read and write CSV files. In this article, you will learn how to parse CSV files in NodeJS. One of the most common uses of CSV files is to import and export data. The records have values separated by commas that represent fields. CSV files store tabular data where each of the lines in the file represents a record. A Comma Separated Values (CSV) file is a text file whose values are separated by commas.
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