👀 Views: 1 💬 Answers: 1 📅 Created: 2025-06-06

Flask JSON TypeError Python

I've spent hours debugging this and This might be a silly question, but I'm writing unit tests and I'm building a feature where I keep running into I'm developing a Flask application that processes JSON data from an external API. I'm working with a `TypeError: 'NoneType' object is not subscriptable` when trying to access elements in the JSON response. The API returns a JSON object that looks like this: ```json { "data": { "items": [ { "id": 1, "name": "Item1" }, { "id": 2, "name": "Item2" } ] } } ``` In my Flask route, I'm trying to extract the items using the following code: ```python from flask import Flask, jsonify, request import requests app = Flask(__name__) @app.route('/process', methods=['POST']) def process_data(): response = requests.get('https://api.example.com/data') json_data = response.json() items = json_data['data']['items'] # This line throws the TypeError return jsonify(items) ``` I've checked the API response, and it seems to return a successful status code (200), but when I log `json_data`, it prints `{'data': None}` instead of the expected structure. I tried adding behavior handling to check if `json_data['data']` is `None` before accessing `items`, but it doesn't prevent the crash. ```python if json_data.get('data') is None: return jsonify({'behavior': 'No data found'}), 500 ``` However, the behavior still gets raised at the original line. I also tried using `json_data.get('data', {}).get('items', [])`, but this doesn't help either since it doesn't provide a clear behavior message or handle the case where the data structure is not as expected. I'm using Flask 2.0.1 and requests 2.25.1. Does anyone have insight into how I might debug this further or prevent this behavior without crashing the application? I've been using Python for about a year now. Thanks for your help in advance! This is my first time working with Python latest. This is happening in both development and production on CentOS. What's the correct way to implement this? Is there a simpler solution I'm overlooking?