Malformed JSON From APIs: How to Handle and Sanitize It
Handle malformed JSON from APIs: detection strategies, sanitization approaches, lenient parsers, and fallback patterns for production systems.
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Tags: json, developer-tools, api
Malformed JSON From APIs: How to Handle and Sanitize It Not every API follows the rules. Some wrap responses in callback function calls. Some prepend invisible Unicode characters. Some concatenate multiple JSON objects in a single response body. When you're integrating with a third-party API, a legacy internal service, or scraping structured data from the web, you'll occasionally receive something that isn't valid JSON but should be. This guide covers the most common patterns of malformed JSON from APIs, how to detect them, and how to handle or sanitize them reliably. --- Pattern 1: JSONP Wrapping JSONP (JSON with Padding) is a pre-CORS technique for cross-origin data loading. Instead of returning raw JSON, the server wraps the payload in a JavaScript function call: Or with a callback…
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