How to Read and Write a JSON File in Python?

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Jan 06, 2023

Hi Dev,

Here, I will show you how to works how to read and write a json file in python. let’s discuss about python open read write json file. I would like to show you python reading and writing json file example. you'll learn how to create and read a json file in python.

If you need to see an example of python read and write json file. I would like to show you python open read write json file. you'll learn how to read and write a json file in python. This tutorial will give you a simple example of how to create and read a json file in python. follow the below example for python reading and writing json file example.

Example 1: Read JSON File in Python

I simply created data.json file with content as like below:

data.json

[
  {
    "ID": 1,
    "Name": "Piyush Patel",
    "email": "[email protected]"
  },
  {
    "ID": 2,
    "Name": "Savan Rathod",
    "email": "[email protected]"
  },
  {
    "ID": 3,
    "Name": "Raju Mochi",
    "email": "[email protected]"
  }
]

main.py

import json

  
# Opening JSON file
f = open('data.json')

   
# Get JSON Data from Object
data = json.load(f)

    
# Get JSON Data ROW
for row in data:
    print(row)

    
# Closing file
f.close()

Output:

{'ID': 1, 'Name': 'Piyush Patel', 'email': '[email protected]'}
{'ID': 2, 'Name': 'Savan Rathod', 'email': '[email protected]'}
{'ID': 3, 'Name': 'Raju Mochi', 'email': '[email protected]'}

Example 2: Write JSON File in Python

main.py

import json

  
# Create List for write data into json file
data = [
    { "ID": 1, "Name": "Piyush Patel", "email": "[email protected]"},
    { "ID": 2, "Name": "Savan Rathod", "email": "[email protected]"},
    { "ID": 3, "Name": "Raju Mochi", "email": "[email protected]"}
]

  
# Create Json file with list
with open('data.json', 'w') as f:
    json.dump(data, f, indent=2)

  
print("New data.json file is created from list")

Output:

[
  {
    "ID": 1,
    "Name": "Piyush Patel",
    "email": "[email protected]"
  },
  {
    "ID": 2,
    "Name": "Savan Rathod",
    "email": "[email protected]"
  },
  {
    "ID": 3,
    "Name": "Raju Mochi",
    "email": "[email protected]"
  }
]

Example 3: Read and Write to Same JSON File in Python

I simply created data.json file with content as like below showed you. we will open that file and read it, Then write some more content on it.

data.json

[
  {
    "ID": 1,
    "Name": "Piyush Patel",
    "email": "[email protected]"
  },
  {
    "ID": 2,
    "Name": "Savan Rathod",
    "email": "[email protected]"
  },
  {
    "ID": 3,
    "Name": "Raju Mochi",
    "email": "[email protected]"
  }
]

main.py

# Read Existing JSON File
with open('data.json') as f:
    data = json.load(f)

  
# Append new object to list data
data.append({
        "ID": 4,
        "Name": "Rahul Shinde",
        "email": "[email protected]"
    })

  
# Append new object to list data
data.append({
        "ID": 5,
        "Name": "Jaydip Pathar",
        "email": "[email protected]"
    })

    
# Create new JSON file
with open('data.json', 'w') as f:
    json.dump(data, f, indent=2)

  
# Closing file
f.close()

Output:

[
  {
    "ID": 1,
    "Name": "Piyush Patel",
    "email": "[email protected]"
  },
  {
    "ID": 2,
    "Name": "Savan Rathod",
    "email": "[email protected]"
  },
  {
    "ID": 3,
    "Name": "Raju mochi"
    "email": "[email protected]"
  },
  {
    "ID": 4,
    "Name": "Rahul Shinde",
    "email": "[email protected]"
  },
  {
    "ID": 5,
    "Name": "Jaydip Pathar",
    "email": "[email protected]"
  }
]