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 2: BOM (Byte Order Mark) Prefix The UTF-8 BOM is a sequence of three bytes () that some tools and Windows text editors prepend to files and responses. It's invisible in most text editors and terminals. What it looks…
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