Check if Json Object has Empty Value in Python

We have JSON data and we need to check if the JSON Object has an empty value or not in Python. In this article, we will see some methods that help us to check if JSON objects have empty values or not in Python.

Example

Input : '{"name": "John", "age": 25, "city": ""}'
Output : Empty Value Found for Key : City 
Explanation: Here, we have JSON data, and we identify the city with an empty value.

How to Check If Json Object has Empty Value in Python

Below, are the methods of how to check if a JSON Object has an empty value in Python:

• Iterating JSON Keys and Values
• Using List Comprehension
• Using JSON path-ng Library

Check If Json Object Has Empty Value by Iterating JSON Keys and Values

In this example, below code imports, the `json` module, processes a JSON string (`,`) with key-value pairs, and converts it into a Python dictionary (`parsed_json`). It then iterates through the dictionary, identifying and printing keys linked to empty values like an empty string or null.

Python3

import json

json_data = '{"name": "John", "age": 25, "city": "", "email": null}'
parsed_json = json.loads(json_data)

for key, value in parsed_json.items():
    if not value:
        print(f"Empty value found for key: {key}")

Output

Empty value found for key: city
Empty value found for key: email

Check If Json Object Has Empty Value Using List Comprehension

This Python code uses the json module to parse a JSON string (json_data) into a Python dictionary (parsed_json). It then creates a list (empty_values) to check for empty values in the dictionary. The result is determined using the any() function.

Python3

import json

json_data = '{"name": "John", "age": 25, "city": "", "email": null}'
parsed_json = json.loads(json_data)

empty_values = [not value for value in parsed_json.values()]
result = any(empty_values)

print(f"Does the JSON object have empty values? {result}")

Output

Does the JSON object have empty values? True

Check If Json Object Has Empty Value Using jsonpath-ng Library

In this example, below code employs the json and jsonpath_ng modules to process a JSON string (json_data). It loads the data into a Python dictionary (parsed_json) and utilizes a JSONPath expression to find elements with null or empty values. The result is a boolean value indicating whether the JSON object contains such values,

Python3

import json
from jsonpath_ng import jsonpath, parse

json_data = '{"name": "John", "age": 25, "city": "", "email": null}'
parsed_json = json.loads(json_data)

# Using select with a lambda function for filtering
jsonpath_expr = parse("$..*").find(parsed_json)
matches = [match.value for match in jsonpath_expr if match.value == '' or match.value is None]
result = bool(matches)

print(f"Does the JSON object have empty values? {result}")

Output:

Does the JSON object have empty values? True