const pdfSchema = new mongoose.Schema({ title: String, author: String, publicationDate: Date, link: String });
useEffect(() => { axios.get('http://localhost:3000/pdfs') .then(response => setPdfs(response.data)) .catch(error => console.error(error)); }, []);
mongoose.connect('mongodb://localhost/pdf-library', { useNewUrlParser: true, useUnifiedTopology: true });