Modify JSON File in Python Tutorial Example

Hi Dev,

In this article we will cover on how to implement modify json file in python tutorial example. In this article, we will implement a python json update value by key. This article goes in detailed on how to edit a json file python. This tutorial will give you simple example of python open json file and edit.

There are several ways to update the JSON file in python. Here, i will give you very simple example of edit JSON file using open(), append(), dump() and close() functions. so let's see a simple example below:

Example :

main.py

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": "piyush@gmail.com"
  },
  {
    "ID": 2,
    "Name": "Savan Rathod",
    "email": "savan@gmail.com"
  },
  {
    "ID": 3,
    "Name": "Raju Mochi",
    "email": "raju@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": "Rahul Shinde",
        "email": "rahul@gmail.com"
    })
  
# Append new object to list data
data.append({
        "ID": 5,
        "Name": "Jaydip Pathar",
        "email": "jaydip@gmail.com"
    })
    
# 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": "piyush@gmail.com"
  },
  {
    "ID": 2,
    "Name": "Savan Rathod",
    "email": "savan@gmail.com"
  },
  {
    "ID": 3,
    "Name": "Raju Mochi",
    "email": "raju@gmail.com"
  },
  {
    "ID": 4,
    "Name": "Rahul Shinde",
    "email": "rahul@gmail.com"
  },
  {
    "ID": 5,
    "Name": "Jaydip Pathar",
    "email": "jaydip@gmail.com"
  }
]