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Bug: json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) #3

Answered by Ki-Seki
Z1zs asked this question in Q&A
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Here’s a best practice suggested by @J1awei-Yang to help others when facing issues with JSON data extraction.

Best Practice: Reliable JSON Extraction from LLM Responses with Retry

The Problem

When calling a language model (LLM) to generate structured JSON output, it’s common for the model to occasionally return malformed JSON—such as extra text, missing commas, or unclosed braces. This causes json.loads() to raise a JSONDecodeError.

response = llm.generate(prompt)
json.loads(response)  # 💥 Raises JSONDecodeError if the response is not valid JSON

The Solution: Wrap Both the LLM Call and JSON Parsing in a Retry

Use a retry mechanism (e.g., Tenacity) to automatically retry the entire process—

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