Export csv file into json file


CSV (Comma Separated Values) is a most common file format that is widely supported by many platforms and applications. It is easier to export data as a csv dump from one system to another system. In Python it is simple to read data from csv file and export data to csv. The csv package comes with very handy methods and arguments to read and write csv file.



## JSON JSON( Java Script Object Notation) is a lightweight text based data-interchange format which is completely language independent. It is based on JavaScript. Easy to understand, manipulate and generate. In Python there are lot of packages to simplify working with json. We are going to use json module in this tutorial.


    "Name" : "Alex",
    "City" : "Chennai",
    "Country" : "India",
    "Age" : 25,
    "Skills" : [ "Java", "JSP"]

Steps to Convert CSV into JSON

  1. Get paths to both input csv file, output json file and json formatting via Command line arguments
  2. Read CSV file using Python CSV DictReader
  3. Convert the csv data into JSON or Pretty print JSON if required
  4. Write the JSON to output file



import sys, getopt
import csv
import json

#Get Command Line Arguments
def main(argv):
    input_file = ''
    output_file = ''
    format = ''
        opts, args = getopt.getopt(argv,"hi:o:f:",["ifile=","ofile=","format="])
    except getopt.GetoptError:
        print 'csv_json.py -i <path to inputfile> -o <path to outputfile> -f <dump/pretty>'
    for opt, arg in opts:
        if opt == '-h':
            print 'csv_json.py -i <path to inputfile> -o <path to outputfile> -f <dump/pretty>'
        elif opt in ("-i", "--ifile"):
            input_file = arg
        elif opt in ("-o", "--ofile"):
            output_file = arg
        elif opt in ("-f", "--format"):
            format = arg
    read_csv(input_file, output_file, format)

#Read CSV File
def read_csv(file, json_file, format):
    csv_rows = []
    with open(file) as csvfile:
        reader = csv.DictReader(csvfile)
        title = reader.fieldnames
        for row in reader:
            csv_rows.extend([{title[i]:row[title[i]] for i in range(len(title))}])
        write_json(csv_rows, json_file, format)

#Convert csv data into json and write it
def write_json(data, json_file, format):
    with open(json_file, "w") as f:
        if format == "pretty":
            f.write(json.dumps(data, sort_keys=False, indent=4, separators=(',', ': '),encoding="utf-8",ensure_ascii=False))

if __name__ == "__main__":

How to run?

Run the script via command line.

To print json dump

python csv-json.py -i users.csv -o users.json -f dump

To print json in pretty format

python csv-json.py -i users.csv -o users.json -f pretty

Packages Used

  1. sys
  2. getopt
  3. csv
  4. json

Got any suggestions? Feel free to comment below