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server.js
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server.js
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const express = require('express');
const axios = require('axios');
const cors = require('cors');
require('dotenv').config();
const app = express();
const PORT = process.env.PORT || 3000;
app.use(cors());
app.use(express.json());
app.use(express.static('public'));
const OPENAI_API_KEY = process.env.OPENAI_API_KEY;
app.post('/generate-questions', async (req, res) => {
const { inputText } = req.body;
if (!inputText) {
return res.status(400).send({ error: 'Input text is required' });
}
const systemPrompt = "Act as an examiner. Given the material, generate 5 open-ended questions and 10 questions with A, B, C, D options. There should always be only one correct solution to the question, and the correct answer shall not always be the same lettered option.";
const clientPrompt = `Text: ${inputText}\n\nGenerate the 15 questions based on the above text:`;
const messages = [
{ role: "system", content: systemPrompt },
{ role: "user", content: clientPrompt }
];
// Helper function to estimate token count
function estimateTokenCount(text) {
// Simple approximation: tokens are roughly the number of words
return text.split(/\s+/).length;
}
const maxTokensPerRequest = 4096 - 150; // Adjust for system prompt, completion, and some buffer
// Split the input text if it exceeds the max token limit
function splitText(text, maxLength) {
const chunks = [];
let currentChunk = '';
for (const word of text.split(' ')) {
if ((currentChunk + ' ' + word).length > maxLength) {
chunks.push(currentChunk.trim());
currentChunk = '';
}
currentChunk += ' ' + word;
}
if (currentChunk.trim()) {
chunks.push(currentChunk.trim());
}
return chunks;
}
const inputTextChunks = splitText(inputText, maxTokensPerRequest);
try {
let questions = [];
for (const chunk of inputTextChunks) {
const clientPromptChunk = `Text: ${chunk}\n\nGenerate the 15 questions based on the above text:`;
const messagesChunk = [
{ role: "system", content: systemPrompt },
{ role: "user", content: clientPromptChunk }
];
const response = await axios.post(
'https://api.openai.com/v1/chat/completions',
{
model: "gpt-3.5-turbo",
messages: messagesChunk,
max_tokens: 1000,
temperature: 0.7,
},
{
headers: {
'Content-Type': 'application/json',
Authorization: `Bearer ${OPENAI_API_KEY}`,
},
}
);
console.log(response);
const generatedText = response.data.choices[0].message.content.trim();
questions = questions.concat(generatedText.split('\n'));
}
res.send({ questions });
} catch (error) {
console.error(error);
res.status(500).send({ error: 'Error generating questions' });
}
});
app.listen(PORT, () => {
console.log(`Server is running on port ${PORT}`);
});