Two ways/methods to parse a CSV file content to JSON (Typescript)

Introduction

Let's say you have a CSV file which you want to read data from and convert to JSON using typescript, how do you go about it?

First Method: Using csv-parser package

First of all you'll need to install csv-parser package to your project by running the code:

npm install csv-parser

After installing csv-parser, you'll need to use the code snippet to help you extract and convert data in a CSV file to JSON.

import fs from "fs";
import csv from "csv-parser"

async function parseCSV(filePath: string) {
    let results: any[] = [];

    try {
        const readPromise = new Promise((resolve, reject) => {
            fs.createReadStream(filePath)
        .pipe(csv())
        .on('data', (data) => results.push(data))
        .on('end', () => {
            fs.unlink(filePath as string, (error) => {
                if (error) {
                    reject(error);
                  } else {
                    resolve(results);
                  }
            });
        })
        .on('error', (error) => reject(error));
        });

        return readPromise;

    } catch (error) {
        console.log(error);
        return null;
    }
}

export {
    parseCSV
}

To use this code snippet, call parseCSV and pass the file path to the CSV as argument. Here is an example below:

const JSONResult = await parseCSV("/path/to/file");

Second method: Using papaparse package

You can also convert the content of a CSV file to JSON using the package named papaparse. You can install on your project by running the code below:

npm install papaparse

Then, next, the code snippet:

import Papa from "papaparse";

Papa.parse("path/to/file", {
  complete: (result: any) => {
    console.log("JSON data", result.data);
  }
});

Conclusion

There are more methods to convert contents of a CSV file to JSON, but here are the two methods which works perfectly for me, I hope it also works for you, enjoy.