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Error Explainer

Paste an error message and get a clear explanation of what it means.

\n\n \n
\n \n\n

\n\n \n\n`;\n\nexport default async function (req: Request): Promise {\n if (req.method === \"OPTIONS\") {\n return new Response(null, {\n headers: {\n \"Access-Control-Allow-Origin\": \"*\",\n \"Access-Control-Allow-Methods\": \"GET, POST, OPTIONS\",\n \"Access-Control-Allow-Headers\": \"Content-Type\",\n },\n });\n }\n\n const url = new URL(req.url);\n\n // Serve the HTML form for plain GET requests with no ?error param\n if (req.method === \"GET\" && !url.searchParams.get(\"error\")) {\n return new Response(HTML_PAGE, {\n headers: { \"Content-Type\": \"text/html; charset=utf-8\" },\n });\n }\n\n let errorMessage: string | null = null;\n\n if (req.method === \"POST\") {\n const body = await req.json().catch(() => ({}));\n errorMessage = body.error ?? body.message ?? null;\n } else {\n errorMessage = url.searchParams.get(\"error\");\n }\n\n if (!errorMessage) {\n return Response.json(\n { usage: 'POST { \"error\": \"your error message\" } or GET ?error=...' },\n { status: 400 },\n );\n }\n\n try {\n const completion = await openai.chat.completions.create({\n model: \"gpt-5-nano\",\n max_completion_tokens: 150,\n messages: [\n { role: \"system\", content: SYSTEM_PROMPT },\n {\n role: \"user\",\n content: `Explain this error message: ${errorMessage}`,\n },\n ],\n });\n\n const explanation = completion.choices[0]?.message?.content ??\n \"Hmm, couldn't explain that one!\";\n\n return Response.json(\n { original: errorMessage, explanation },\n { headers: { \"Access-Control-Allow-Origin\": \"*\" } },\n );\n } catch (err) {\n return Response.json(\n {\n error: \"Something went wrong calling the AI model\",\n detail: String(err),\n },\n { status: 500, headers: { \"Access-Control-Allow-Origin\": \"*\" } },\n );\n }\n}","deleted",false,"label",[19],{"_33":61,"_13":62,"_35":63,"_37":-5,"_38":39,"_40":64,"_42":43,"_44":65,"_17":66,"_47":67,"_49":68,"_51":52,"_53":-5,"_58":69,"_18":70},{"_33":34,"_13":19,"_35":36,"_37":-5,"_38":39,"_40":41,"_42":43,"_44":57,"_17":46,"_47":48,"_49":50,"_51":52,"_53":14,"_58":59,"_18":60},["D",1788760212312],"children",[],[19],"caa43f58-114c-40ef-be51-a2ac6296e903","main.ts","8f5e5cc6-aa7e-11f1-9e75-1607ee4eb77e",2,["D",1788759606886],1,"script","// explain-like-im-5.ts\nimport { OpenAI } from \"https://esm.town/v/std/openai\";\n\nconst openai = new OpenAI();\n\nexport default async function (req: Request): Promise {\n if (req.method === \"OPTIONS\") {\n return new Response(null, {\n headers: {\n \"Access-Control-Allow-Origin\": \"*\",\n \"Access-Control-Allow-Methods\": \"GET, POST, OPTIONS\",\n \"Access-Control-Allow-Headers\": \"Content-Type\",\n },\n });\n }\n\n let errorMessage: string | null = null;\n\n if (req.method === \"POST\") {\n const body = await req.json().catch(() => ({}));\n errorMessage = body.error ?? body.message ?? null;\n } else {\n const url = new URL(req.url);\n errorMessage = url.searchParams.get(\"error\");\n }\n\n if (!errorMessage) {\n return Response.json(\n { usage: 'POST { \"error\": \"your error message\" } or GET ?error=...' },\n { status: 400 },\n );\n }\n\n const completion = await openai.chat.completions.create({\n model: \"gpt-5-nano\", // free tier friendly; swap for gpt-4o-mini etc if you like\n max_tokens: 150,\n messages: [\n {\n role: \"system\",\n content:\n \"You explain programming error messages to a curious 5-year-old. 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