Why JSON.parse() Fails Silently on Truncated LLM Responses (And What I Did About It)

Why JSON.parse Fails Silently on Truncated LLM Responses (And What I Did About It) If you've shipped anything that asks an LLM to return JSON, you've already hit this bug. You just may not have noticed. The LLM returns a response. Your code parses it. Most of the time it works. Sometimes it returns {} and you assume the LLM didn't find anything. The reality is darker: the JSON was truncated mid-object, your parser silently failed, and your downstream code is now operating on an empty dictionary instead of the partial result the LLM actually produced. I lost six weeks to this bug.