Python JSON: Create a new JSON file from an existing JSON file

Last update on June 28 2025 12:50:17 (UTC/GMT +8 hours)

6. Create a New JSON File from an Existing JSON File

Write a Python program to create a new JSON file from an existing JSON file.

Sample Solution:-

Python Code:

import json

with open('states.json') as f:
  state_data= json.load(f)

for state in state_data['states']:
  del state['area_codes']

with open('new_states.json', 'w') as f:
  json.dump(state_data, f, indent=2)

Output:

new_states.json
{
  "states": [
    {
      "name": "Alabama",
      "abbreviation": "AL"
    },
    {
      "name": "Alaska",
      "abbreviation": "AK"
    },
    {
      "name": "Arizona",
      "abbreviation": "AZ"
    },
    {
      "name": "Arkansas",
      "abbreviation": "AR"
    },
    {
      "name": "California",
      "abbreviation": "CA"
    },
    {
      "name": "Colorado",
      "abbreviation": "CO"
    },
    {
      "name": "Connecticut",
      "abbreviation": "CT"
    },
    {
      "name": "Delaware",
      "abbreviation": "DE"
    },
    {
      "name": "Florida",
      "abbreviation": "FL"
    },
    {
      "name": "Georgia",
      "abbreviation": "GA"
    },
    {
      "name": "Hawaii",
      "abbreviation": "HI"
    },
    {
      "name": "Idaho",
      "abbreviation": "ID"
    },
    {
      "name": "Illinois",
      "abbreviation": "IL"
    },
    {
      "name": "Indiana",
      "abbreviation": "IN"
    },
    {
      "name": "Iowa",
      "abbreviation": "IA"
    },
    {
      "name": "Kansas",
      "abbreviation": "KS"
    },
    {
      "name": "Kentucky",
      "abbreviation": "KY"
    },
    {
      "name": "Louisiana",
      "abbreviation": "LA"
    },
    {
      "name": "Maine",
      "abbreviation": "ME"
    },
    {
      "name": "Maryland",
      "abbreviation": "MD"
    },
    {
      "name": "Massachusetts",
      "abbreviation": "MA"
    },
    {
      "name": "Michigan",
      "abbreviation": "MI"
    },
    {
      "name": "Minnesota",
      "abbreviation": "MN"
    },
    {
      "name": "Mississippi",
      "abbreviation": "MS"
    },
    {
      "name": "Missouri",
      "abbreviation": "MO"
    },
    {
      "name": "Montana",
      "abbreviation": "MT"
    },
    {
      "name": "Nebraska",
      "abbreviation": "NE"
    },
    {
      "name": "Nevada",
      "abbreviation": "NV"
    },
    {
      "name": "New Hampshire",
      "abbreviation": "NH"
    },
    {
      "name": "New Jersey",
      "abbreviation": "NJ"
    },
    {
      "name": "New Mexico",
      "abbreviation": "NM"
    },
    {
      "name": "New York",
      "abbreviation": "NY"
    },
    {
      "name": "North Carolina",
      "abbreviation": "NC"
    },
    {
      "name": "North Dakota",
      "abbreviation": "ND"
    },
    {
      "name": "Ohio",
      "abbreviation": "OH"
    },
    {
      "name": "Oklahoma",
      "abbreviation": "OK"
    },
    {
      "name": "Oregon",
      "abbreviation": "OR"
    },
    {
      "name": "Pennsylvania",
      "abbreviation": "PA"
    },
    {
      "name": "Rhode Island",
      "abbreviation": "RI"
    },
    {
      "name": "South Carolina",
      "abbreviation": "SC"
    },
    {
      "name": "South Dakota",
      "abbreviation": "SD"
    },
    {
      "name": "Tennessee",
      "abbreviation": "TN"
    },
    {
      "name": "Texas",
      "abbreviation": "TX"
    },
    {
      "name": "Utah",
      "abbreviation": "UT"
    },
    {
      "name": "Vermont",
      "abbreviation": "VT"
    },
    {
      "name": "Virginia",
      "abbreviation": "VA"
    },
    {
      "name": "Washington",
      "abbreviation": "WA"
    },
    {
      "name": "West Virginia",
      "abbreviation": "WV"
    },
    {
      "name": "Wisconsin",
      "abbreviation": "WI"
    },
    {
      "name": "Wyoming",
      "abbreviation": "WY"
    }
  ]
}

Flowchart:

Flowchart: Create a new JSON file from an existing JSON file.

For more Practice: Solve these Related Problems:

Write a Python program to read a JSON file, modify its content, and write the updated data to a new JSON file.
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Write a Python program to merge two JSON files into one and output the merged result as a new JSON file.
Write a Python program to read a JSON file, filter out specific keys, and save the modified dictionary to a new file.

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