We can convert the CSV file to a JSON file in Python by using the following methods. So, we need some method to convert the CSV format data to JSON format.

Suppose we have data saved in CSV ( Comma Separated Values) format, and we need to convert it to JSON format. In web applications, the format used to save and transfer data is the JSON format. This tutorial will demonstrate various methods to read data from a CSV file and save it as a JSON file in Python.

Convert CSV File to JSON File in Python Using the Dataframe.to_json() Method in Python.

Convert CSV File to JSON File in Python Using the json.dump() Method in Python.

To convert CSV to JSON in Python, follow these steps: You have to convert the JSON data into a Python dictionary using the ‘load’ method.

Call the ‘writer’ function passing the CSV file as a parameter and use the ‘writerow’ method to write the JSON file content (now converted into Python dictionary) into the CSV file.

Read the lines of CSV file using csv.DictReader() function.

Add the dictionary to the Python List created in step 1.

Convert the Python List to JSON String using json.dumps().You may write the JSON String to a JSON file.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). 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 Output: data.json Conversion 100.000 rows completed successfully in 0.

Python json to csv