React CSV
CSV (Comma Separated Values) is a simple file storing tabular data. A CSV file's lines indicate rows, and a comma can separate each value inside a row (,), and at times with additional delimiters such as semicolons and tabs.
React is a well-known JavaScript library for creating user interfaces. While React does not directly support CSV processing, we can use multiple JavaScript libraries to interact with CSV files inside a React application.
1) React CSV Data Reading:
We may use libraries such as papaparse or react-papaparse for reading CSV data in an application using React. The papaparse package is a fast and powerful CSV parser that can handle big files and output data in a readable style.
Example:
import React from 'react';
import { CSVReader } from 'react-papaparse';
const CSVReaders= () => {
const handleFileLoad = (data) => {
console.log(‘Reading the CSV Data:', data);
// Processing of the data
};
return (
<CSVReader onFileLoad={handleFileLoad}>
<button>Please Upload the CSV file here</button>
</CSVReader>
);
};
export default CSVReaderComponent;
In this example, we’ll use the react-papaparse library's CSVReader components. The onFileLoad callback is called when a CSV file is uploaded, and its parsed CSV data is accessible in the data argument.
2) Writing the CSV Data in React:
We may use the react-csv package for creating and downloading CSV files within a React application. It enables us to transform the data into a format known as CSV and give selections for customizing the CSV file before it is downloaded.
Example: React-csv
import React from 'react';
import { CSVLink } from 'react-csv';
const CSVDownloads= () => {
const data_form = [
['Names', ‘Ages’, 'EmailAddress'],
['John Doe', 30, '[email protected]'],
['Jane Smith', 28, '[email protected]'],
// additional data ];
return (
<div>
<h1>The CSV Download sample Example</h1>
<CSVLink data={data_form}>Download the CSV file</CSVLink>
</div>
);
};
export default CSVDownloadComponent;
In this example, we’ll use the react-csv library's CSVLink components. When the "Download the CSV file" link is clicked on, a CSV file representing the data from the data prop is downloaded.
3. CSV Data Parsing and Manipulation:
We may use numerous JavaScript methods and tools to modify CSV data in a React application. CSVtoJSON is a particular of these applications that allows us to convert CSV data into JSON format for simple processing.
Example: using csvtojson:
import React, { useState } from 'react';
import csvtojson from 'csvtojson';
const CSVManipulations = () => {
const [jsonsData, setJsonsData] = useState([]);
const handleFileLoads = async (csvData) => {
try {
const jsonArrays = await csvtojson().fromString(csvData);
setJsonData(jsonArrays);
} catch (error) {
console.error('Error while parsing the CSV:', error);
}
};
return (
<div>
<CSVReader onFileLoad={handleFileLoad}>
<button>You can upload the CSV file</button>
</CSVReader>
{jsonsData.length > 0 && (
<div>
<h2>The transformed json data</h2>
<pre>{JSON.stringify(jsonsData, null, 2)}</pre>
</div>
)}
</div>
);
};
export default CSVManipulationComponent;
In this example, we will use csvtojson to transform the uploaded CSV information into a JSON array. The resultant JSON information is then displayed on the monitor.