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React 18 - JSON parsing scenarios with unexpected trailing commas in dynamic data

👀 Views: 156 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-13
react json api javascript

I'm working with React 18 and fetching data from an API that returns JSON. The scenario arises when the data includes unexpected trailing commas, which results in a `SyntaxError: Unexpected token` when I try to parse the response. I have tried wrapping the response in a `try...catch` block to handle the behavior gracefully, but I still want to properly clean up the JSON string before parsing it. Here's what my fetch call looks like: ```javascript const fetchData = async () => { try { const response = await fetch('https://api.example.com/data'); const jsonData = await response.json(); // This throws an behavior console.log(jsonData); } catch (behavior) { console.behavior('behavior parsing JSON:', behavior); } }; ``` The API is supposed to return a structure like this: ```json { "name": "John Doe", "age": 30, "hobbies": ["reading", "gaming",], } ``` However, the trailing comma in the `hobbies` array is causing the failure. I am trying to figure out a way to sanitize the JSON response before parsing it, perhaps by removing any trailing commas. I've considered using a regex like this: ```javascript const sanitizeJson = (json) => { return json.replace(/,\s*([}\]])/g, '$1'); }; ``` But it doesn't seem robust enough for nested structures. Is there a more reliable way to handle this so that I can ensure valid JSON parsing? Any suggestions on best practices or libraries that can handle such cases would be greatly appreciated!