Build a Bounded JSON Repair Loop for LLM Output in Python

📰 Dev.to · Alex Chen

Learn to build a bounded JSON repair loop for LLM output in Python to separate syntax, shape, and semantic errors

intermediate Published 15 Jul 2026
Action Steps
  1. Import the necessary libraries, including json and a JSON validation library
  2. Define a function to check for JSON syntax errors and return an error message if found
  3. Implement a loop to attempt repairs on the JSON output, with a bounded number of attempts to prevent infinite loops
  4. Use a try-except block to catch and handle shape and semantic errors during the repair process
  5. Test the function with sample LLM output to validate its effectiveness
Who Needs to Know This

Data scientists and software engineers working with LLMs can benefit from this technique to improve the accuracy and reliability of their models

Key Insight

💡 Separating JSON syntax errors, shape errors, and semantic errors is crucial for effective LLM output repair

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🚀 Build a bounded JSON repair loop for LLM output in Python to improve model accuracy and reliability! 📊

Key Takeaways

Learn to build a bounded JSON repair loop for LLM output in Python to separate syntax, shape, and semantic errors

Full Article

Learn to separate JSON syntax errors, shape errors, and semantic errors while limiting model repair attempts.
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