Read and Write JSON in Python

Read and Write JSON in Python

What is a JSON file?

According to Wikipedia JSON is “JavaScript Object Notation (JSON, pronounced /ˈdʒeɪsən/; also /ˈdʒeɪˌsɒn/) is an open standard file format, and data interchange format, that uses human-readable text to store and transmit data objects consisting of attribute–value pairs and array data types (or any other serializable value).”

In Short JSON is:

  • It is Light-weight file format to exchange data.
  • Data is written in key : value pairs. just like dictionaries in python.


Luckily Python has an in-built package named ‘JSON’ which can parse and manipulate data.

import json  #imports json package

To parse the json file we need open the json file in python and then pass the file object in json.load() function.

JSON file :

import json
 #open json as file object
data=json.load(f)  #parse file object 
 #print parsed json

Next, we want to access the key: vale pairs in the json file.

Just like dictionaries in python, data can be accessed by using indexing where ‘key’ is index value.Remember Keys are case sensitive.

Structure of JSON (partial)
import json
 #covid-19 data 16aug2020
print(data['Global'])  #print value in 'Global' key.
print(data['Global']['NewConfirmed']) #print integer value in new confirmed

Write JSON

As we have already seen that JSON is very much similar to python dictionaries therefore the simplest way to create a JSON file would be to convert dictionary into JSON.

Json dump function does the job of json creation easily.

import json

 #make a dictionary with key-value pairs
with open('datadump.json', 'w') as json_file: #open file to write
    json.dump(data, json_file)  #dump json data

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