Idea Odyssey | Interactive

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\n\n\n\n`;\n}\n\n// --- MAIN VAL TOWN FUNCTION ---\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n\n if (req.method === \"POST\" && url.pathname.endsWith(\"/expand\")) {\n try {\n const body = await req.json();\n const topic = body.topic;\n\n if (!topic || typeof topic !== \"string\" || topic.trim().length === 0) {\n return new Response(\n JSON.stringify({ error: \"A valid 'topic' string is required.\" }),\n {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n\n const openai = new OpenAI();\n const completion = await openai.chat.completions.create({\n model: \"gpt-4o\",\n messages: [\n { role: \"system\", content: GRAPH_GENERATOR_PROMPT },\n { role: \"user\", content: `The central concept is: \"${topic}\"` },\n ],\n temperature: 0.7,\n response_format: { type: \"json_object\" },\n });\n\n const content = completion.choices[0].message.content;\n const parsedContent = extractJson(content);\n\n if (\n !parsedContent || !parsedContent.expansion ||\n !Array.isArray(parsedContent.expansion)\n ) {\n throw new Error(\"AI returned data in an invalid format.\");\n }\n\n return new Response(JSON.stringify(parsedContent), {\n headers: { \"Content-Type\": \"application/json\" },\n });\n } catch (error) {\n console.error(\"AI Expansion Error:\", error);\n return new Response(\n JSON.stringify({\n error: error.message || \"An unknown server error occurred.\",\n }),\n {\n status: 500,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n }\n\n const baseUrl = `https://${url.hostname}${url.pathname}`;\n return new Response(\n generateHtml(baseUrl.endsWith(\"/\") ? baseUrl : baseUrl + \"/\"),\n {\n headers: { \"Content-Type\": \"text/html\" },\n },\n );\n}","deleted","label",[99],"permalink","https://www.val.town/x/volt/untitled-9066/code/main.ts","extension","actionData","errors"]