Jaison: The Fault-Tolerant JSON Parser for LLM Outputs and Chinese Users

Jaison: The Fault-Tolerant JSON Parser Built for the LLM Era If you’ve ever asked ChatGPT, Claude, Gemini, Qwen, ERNIE, or any large language model to “return JSON,” you already know the pain: the output looks perfect to human eyes but explodes the moment you feed it to JSON.parse. A missing bracket, a trailing comma, Chinese full-width punctuation, single quotes, // comments, “`json Jaison is a zero-dependency, pure JavaScript JSON parser designed from the ground up to fix exactly these problems in a single pass. It silently repairs dozens of structural mistakes that LLMs love to make and hands you back …