Developer releases three free utility APIs to fix LLM JSON, secure Discord webhooks, and generate QR codes

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A developer spent a week building three utility APIs to address common pain points faced when working with large language models and web apps. The first API repairs malformed JSON output from LLMs — such as trailing commas or markdown fences — using a fast local engine under 5ms, with an AI fallback for heavily corrupted inputs. The second API protects Discord webhook URLs by storing them encrypted server-side and exposing only a safe proxy ID to frontend code, also filtering out spam pings. The third API generates PNG and SVG QR codes with custom colors and logo overlays, processed entirely locally at near-zero cost. All three APIs are available on RapidAPI with free tiers requiring no credit card, built using FastAPI, Python, and open-source libraries hosted on Render.

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