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How to Convert CSV to JSON in Python

  • Last updated Apr 25, 2024

Python has a built-in module called csv that provides functions to read and write tabular data in CSV format. Python also has json built-in module which helps to serialize and deserialize JSON data. In this example, we will use both of these built-in Python modules to convert CSV format data to JSON format data.

Let the CSV file data be the following:


The code below converts data of a CSV file to JSON in Python:

import csv
import json

file_path = "D:\data.csv"

with open(file_path, mode='r') as csvfile:

    csvreader = csv.reader(csvfile)
    # read first row field names
    fields = next(csvreader)
    rows = []
    for row in csvreader:
        data_as_dict = {}
        i = 0
        for value in row:
            data_as_dict[fields[i]] = value
            i += 1
    json_data = json.dumps(rows, indent=4)
    print("Total number of row in csv file: %d" % (csvreader.line_num))
    # removing data from rows


The output of the above code is as follows:

[ { "name": "Jonny", "course": "Programming", "id": "1" }, { "name": "Joe", "course": "Engineering", "id": "2" }, { "name": "Danny", "course": "Scientist", "id": "3" }, { "name": "Leni", "course": "Doctor", "id": "4" } ]
Total number of row in csv file: 5