json_repair is an open-source Python library designed to automatically fix malformed JSON data and convert it into valid, parseable structures. The tool is particularly useful in scenarios where JSON output is generated by large language models or external services that may produce syntactically invalid responses. Instead of failing when encountering errors such as missing quotes, trailing commas, or incomplete objects, the library analyzes the malformed data and reconstructs it into valid JSON. The repair process can also be combined with optional JSON Schema validation to enforce structural constraints and ensure the output conforms to expected data types and formats. Developers can integrate the library into applications as a drop-in replacement for standard JSON parsing functions, allowing systems to tolerate imperfect structured data without crashing.

Features

  • Automatic repair of malformed JSON structures
  • Handling of syntax errors such as missing quotes and trailing commas
  • Optional JSON Schema validation for structural constraints
  • Transparent logging of repair operations and corrections
  • Drop-in replacement for standard JSON parsing workflows
  • Optimized handling of inconsistent JSON generated by language models

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License

MIT License

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Additional Project Details

Programming Language

Python

Related Categories

Python Large Language Models (LLM)

Registered

2026-03-04