Python | Check whether a string is valid json or not
Last Updated :
14 Dec, 2023
Given a Python String, the task is to check whether the String is a valid JSON object or not. Let’s try to understand the problem using different examples in Python.
Validate JSON String in Python
There are various methods to Validate JSON schema in Python here we explain some generally used methods for validating JSON schema in Python which are the following:
- Check Whether a String Is Valid JSON
- Use JSON Schema to Validate JSON Strings
- Checking Validity for Multi-Line JSON String
Check Whether a String Is Valid JSON
In the below example, the string is an invalid JSON because, the string characters are enclosed in single quotes (‘), but as per valid JSON schema, strings must be enclosed in double quotes (“).
Python3
import json
ini_string = "{'akshat' : 1, 'nikhil' : 2}"
print ( "initial string" , ini_string)
try :
json_object = json.loads(ini_string)
print ( "Is valid json? true" )
except ValueError as e:
print ( "Is valid json? false" )
|
Output:
initial string {'akshat' : 1, 'nikhil' : 2}
Is valid json? false
Use JSON Schema to Validate JSON Strings
In this example the below code uses a function, `is_valid`, to check JSON string validity with `json.loads()`. It tests the function on three JSON strings containing various data types and prints whether each string is valid or not.
Python3
import json
def is_valid(json_string):
print ( "JSON String:" , json_string)
try :
json.loads(json_string)
print ( " Is valid?: True" )
except ValueError:
print ( " Is valid?: False" )
return None
is_valid( '{"name":"John", "age":31, "Salary":2500000}' )
is_valid( '{ "Subjects": {"Maths":85.01, "Physics":90}}' )
is_valid( '{"success": true}' )
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Output:
JSON String: {"name":"John", "age":31, "Salary":2500000}
Is valid?: True
JSON String: { "Subjects": {"Maths":85.01, "Physics":90}}
Is valid?: True
JSON String: {"success": true}
Is valid?: True
Checking Validity for Multi-Line JSON String
Here we have taken a sample, multi-line Python string, and we’ll try to check the validity of the String for a valid JSON string or not. Although this String contains multiple line-breaks, still json.JSONDecoder able to parse this String.
Python3
import json
def is_valid(json_string):
print ( "JSON String:" , json_string)
try :
json.loads(json_string)
print ( " Is valid?: True" )
except ValueError:
print ( " Is valid?: False" )
return None
json_str =
is_valid(json_str)
|
Output:
JSON String:
{
"Person": [
{"name": "P_1", "age": 42},
{"name": "P_2", "age": 21},
{"name": "P_3", "age": 36}
],
"location": "1.1.0",
"Country": "IND"
}
Is valid?: True
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