server.js

const express = require("express");
const natural = require("natural");
const { removeStopwords, tur } = require("stopword");

const port = 5500;
const host = "127.0.0.1";

let app = express();
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use("/", express.static(__dirname + "/public"));

// Contractions to standard lexicons Conversion
const convertToStandard = (text) => {
  const data = text.split(" ");

  data.forEach((word, index) => {
    word = word.toLocaleLowerCase();
    word = word.replace("ler", "");
    word = word.replace("lar", "");
    word = word.replace("LER", "");
    word = word.replace("LAR", "");
    word = word
      .replace(/ç/g, "c")
      .replace(/ğ/g, "g")
      .replace(/ı/g, "i")
      .replace(/ö/g, "o")
      .replace(/ş/g, "s")
      .replace(/ü/g, "u");
    data[index] = word;
  });

  return data.join(" ");
};

// LowerCase Conversion
const convertTolowerCase = (text) => {
  return text.toLowerCase();
};

// Analysis Route
app.post("/feedback", (request, response) => {
  console.log(request.body);

  // NLP Logic
  // Convert all data to its standard form
  let lexData = convertToStandard(request.body.feedback);
  console.log("Lexed Data: ", lexData);

  // Convert all data to lowercase
  let lowerCaseData = lexData.toLocaleLowerCase("tr");
  console.log("LowerCase Format: ", lowerCaseData);

  // Tokenization
  const tokenizedData = lowerCaseData.split(" ");
  console.log("Tokenized Data: ", tokenizedData);

  // Remove Stopwords
  let filteredData = removeStopwords(tokenizedData, tur);
  console.log("After removing stopwords: ", filteredData);

  // create a BayesClassifier
  const taleClassifier = new natural.BayesClassifier();
  // supply a training set of data for two membership: night and day
  taleClassifier.addDocument(
    "araba kamyon ucak tren dozer itfaiye helikopter motor kamyonet traktor",
    "Taşıtlar"
  );
  taleClassifier.addDocument(
    "prenses tac peri melek buyu sihir kralice kral prens sovalye saray padisah sato iksir cadi sultan perisi perinin prensesi prensesin kiz kizi kizinin guzeller guzel perili buyulu sihirli",
    "Peri Masalları"
  );
  taleClassifier.addDocument(
    "kus kopek tilki kurt karga aslan leopar yunus kaplumbaga tavşan maymun karinca kedi fare maymunu balik baligi ayi panda penguen",
    "Hayvanlar"
  );
  taleClassifier.addDocument(
    "zeus afrodit unicorn pegasus poseidon akhilleus",
    "Mitoloji"
  );

  // training
  taleClassifier.train();

  filteredData = filteredData.join(" ");
  console.log(filteredData);

  categoryResult = taleClassifier.classify(filteredData);

  response.status(200).json({
    message: "Veri Gönderildi.",
    tale_category: categoryResult,
  });
});

app.listen(port, host, () => {
  console.log(`Sunucu ${host} hostunda ve ${port} portunda çalışıyor...`);
});