json




Hello Folks...!!!
Today Let us look at the JSON  package in Python.

What is JSON ?

  • The full form of JSON is JavaScript Object Notation. 
  • It is a format for storing and exchanging data.
  • It is mostly used when data is transferred between server and web pages.
  • These look similar to nested dictionaries in Python. They are just key-value pairs.
  • Look at the image below to visualize a JSON file with two records.
  • The objects of JSON are called JSON string.




Python provides a package for creating and manipulating JSON files.

To utilize the functions provided by this package, import it by writing : import json

Serialization and deserialization

Serialization is the conversion of a python object (mostly dictionaries) into JSON String. Deserialization refers to vice-versa. To be precise it the former refers to conversion of Python objects into JSON format and the later refers to vice-versa.

json.load( )

  • It is used to read the JSON file directly.
  • It can deserialize itself. 
  • The parameter required is the path of the json file.
  • You can directly print the content of a json file as the pointer to the json file is the parameter passed.
For example:



Here I have taken a file named test2.json. I have opened it in read mode and passed to the load() function. We can directly print the contents of the function here. The return type of the function is a Python object- Dictionary. Then the contents can be treated as nor dictionary contents and manipulations can be made using the methods available for dictionary. Look at the example below.



json.loads( )

  • Here the 's' refers to string. 
  • It expects a JSON string parameter instead of file pointer. 
  • It cannot deserialize itself.
  • You have to read the content and use this method for parsing the contents.
For example


You will get an error, if you pass the file to loads( ) function. To overcome this, we have to read the contents first and then pass it to the loads(). So we can write as given below.



This also returns a dictionary data type. But the only difference is, you have to read the content first and pass it as a string to the loads() function.
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