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Developer builds hybrid AI tool for JSON mocking, hits Cloudflare Workers AI bug

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A developer added an AI assistant to Temp API, a free mock-endpoint tool that converts JSON or CSV into live APIs. The design deliberately keeps AI away from data correctness — JSON repair and formatting are handled deterministically using the jsonrepair library, while AI is reserved for generating schemas, sample data, and change explanations. The tool runs on Cloudflare Workers AI using the Qwen2.5-Coder model via an edge binding, requiring no external API keys. A subtle bug caused two of three AI features to fail in production: Workers AI sometimes returns already-parsed JSON objects instead of strings, causing a .trim() call to throw an error. The fix involved checking the response type before processing, a gotcha the developer flagged as worth knowing for anyone building on the platform.

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Developer builds hybrid AI tool for JSON mocking, hits Cloudflare Workers AI bug · ShortSingh