For the test I made 100.000 lines in a csv file with copy/paste, and the whole conversion takes about half a second with Apple’s M1 Chip while the presented example took only 0.0005 seconds.You may write the JSON String to a JSON file.Python is a versatile programming language that is widely used for data analysis and manipulation. Convert the Python List to JSON String using json.dumps(). This article will explain how to convert any CSV file to JSON format using Python.Add the dictionary to the Python List created in step 1.
Read the lines of CSV file using csv.DictReader() function. To convert CSV to JSON in Python, follow these steps: Since I have more than 2000 rows, it is not a feasible solution.Ĭan anyone suggest how to parse CSV file line by line and convert it into JSON without specifying fieldnames? Answer by Milovan Tomašević Python CSV to JSON This post will list the most used methods to convert CSV to JSON string using Python: Method 1: Using df.tojson () Function. write ( ' \n ' )īut the problem with above code is that we need to mention the field names to parse the CSV. Step 1: Take input the CSV file and the JSON file paths This can be achieved with the help of the input function. To make it easier to work with data, the CSV file is converted into JSON using different methods in Python. DictReader ( csvfile, fieldnames ) for row in reader : json. Output: data.json Conversion 100.000 rows completed successfully in 0.Import csv import json csvfile = open ( 'file.csv', 'r' ) jsonfile = open ( 'file.json', 'w' ) fieldnames = ( "FirstName", "LastName", "IDNumber", "Message" ) reader = csv. Print(f"Conversion 100.000 rows completed successfully in seconds") JsonString = json.dumps(jsonArray, indent=4) 
With open(jsonFilePath, 'w', encoding='utf-8') as jsonf: #convert python jsonArray to JSON String and write to file #load csv file data using csv library's dictionary reader With open(csvFilePath, encoding='utf-8') as csvf:
For the test I made 100.000 lines in a csv file with copy/paste, and the whole conversion takes about half a second with Apple's M1 Chip while the presented example took only 0.0005 seconds.ĭef csv_to_json(csvFilePath, jsonFilePath):. import pandas as pd df pd.readcsv ('Input File path') df.tojson ('Out File path') Thats all, above 3 liners are what you need to convert a CSV to json file. 
You may write the JSON String to a JSON file. Lets use simple CSV file example as below, We shall read below file using Python and convert it to JSON array.Convert the Python List to JSON String using json.dumps().
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