Python Read and Write a JSON File Example

Hi Developer,

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.

Here, I will give the following three examples of reading and writing a JSON file in the python program.

1) Read JSON File in Python

2) Write JSON File in Python

4) Read and Write to Same JSON File in Python

Let's see those three examples:

You can use these examples with python3 (Python 3) version.

Example 1: Read JSON File in Python

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

data.json

[
  {
    "ID": 1,
    "Name": "Hardik Savani",
    "email": "hardik@gmail.com"
  },
  {
    "ID": 2,
    "Name": "Vimal Kashiyani",
    "email": "vimal@gmail.com"
  },
  {
    "ID": 3,
    "Name": "Harshad Pathak",
    "email": "harshad@gmail.com"
  }
]

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': 'Hardik Savani', 'email': 'hardik@gmail.com'}
{'ID': 2, 'Name': 'Vimal Kashiyani', 'email': 'vimal@gmail.com'}
{'ID': 3, 'Name': 'Harshad Pathak', 'email': 'harshad@gmail.com'}

Example 2: Write JSON File in Python

main.py

import json
  
# Create List for write data into json file
data = [
    { "ID": 1, "Name": "Hardik Savani", "email": "hardik@gmail.com"},
    { "ID": 2, "Name": "Vimal Kashiyani", "email": "vimal@gmail.com"},
    { "ID": 3, "Name": "Harshad Pathak", "email": "harshad@gmail.com"}
]
  
# 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:

After run successfully above example, you will see data.json file saved in your root path and file content will be as the below:

[
  {
    "ID": 1,
    "Name": "Hardik Savani",
    "email": "hardik@gmail.com"
  },
  {
    "ID": 2,
    "Name": "Vimal Kashiyani",
    "email": "vimal@gmail.com"
  },
  {
    "ID": 3,
    "Name": "Harshad Pathak",
    "email": "harshad@gmail.com"
  }
]

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": "Hardik Savani",
    "email": "hardik@gmail.com"
  },
  {
    "ID": 2,
    "Name": "Vimal Kashiyani",
    "email": "vimal@gmail.com"
  },
  {
    "ID": 3,
    "Name": "Harshad Pathak",
    "email": "harshad@gmail.com"
  }
]

main.py

import json
  
# 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": "Paresh Patel",
        "email": "paresh@gmail.com"
    })
  
# Append new object to list data
data.append({
        "ID": 5,
        "Name": "Rakesh Patel",
        "email": "rakesh@gmail.com"
    })
    
# Create new JSON file
with open('data.json', 'w') as f:
    json.dump(data, f, indent=2)
  
# Closing file
f.close()

Output:

After run successfully above example, you will see data.json file saved in your root path and file content will be as the below:

[
  {
    "ID": 1,
    "Name": "Hardik Savani",
    "email": "hardik@gmail.com"
  },
  {
    "ID": 2,
    "Name": "Vimal Kashiyani",
    "email": "vimal@gmail.com"
  },
  {
    "ID": 3,
    "Name": "Harshad Pathak",
    "email": "harshad@gmail.com"
  },
  {
    "ID": 4,
    "Name": "Paresh Patel",
    "email": "paresh@gmail.com"
  },
  {
    "ID": 5,
    "Name": "Rakesh Patel",
    "email": "rakesh@gmail.com"
  }
]

I hope it can help you...