index.js

const express = require('express');
const bodyParser = require('body-parser');
const fs = require('fs');
const FuzzySet = require('fuzzyset');
//const keep_alive = require('./keep_alive.js')

const app = express();

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.use(express.static('public'));

app.get('/', (req, res) => {
  res.send('Express api is awake.  Usage: /api/addanswer/(id)/(question)/(answer)/ or /api/getdata/ or /api/search/(search query)');
});
app.get('/api/addanswer/:Id/:question/:answer/', (req, res) => {
  try{
  fs.readFile("questions_and_answers.json", 'utf8', function(err, data) {
      
      if (err) throw err;
      var datajson = JSON.parse(data);
      if (!(typeof datajson[req.params.Id] === 'object' && datajson[req.params.Id] !== null)) {//adds id if doesnt already exist as object
        datajson[req.params.Id] = {};
      }
      datajson[req.params.Id][req.params.question] = req.params.answer;
      var dataupdated = JSON.stringify(datajson);
      fs.writeFile("questions_and_answers.json", dataupdated, function(err) {
        if (err) return console.log(err);
        res.send("id: " + req.params.Id + "\nadded question: " + req.params.question + "\nwith answer: " + req.params.answer);
      });
      
  });
  }catch(Err){
      console.log(Err);
  }
});
app.get('/api/getdata/', (req, res) => {
  try{
    fs.readFile("questions_and_answers.json", 'utf8', function(err, data) {
      if (err) return console.log(err);
      res.send(data);
      //console.log(data);
    });
  }catch(Err){
    console.log(Err);
  }
});
app.get('/api/search/:id/:question', (req, res) => {
  try{
    fs.readFile("questions_and_answers.json", 'utf8', function(err, data) {
      if (err) return console.log(err);
      a = FuzzySet();
      var questions=JSON.parse(data)[req.params.id];
      for(var question in questions)a.add(question);
      //questions.forEach((i)=>{a.add(i)});
      var searchResult=a.get(req.params.question,"no match",0.33);//query,default,minimum
      //var answer=encodeURIComponent(searchResult[0][1]);
      var question, confidence,tempJSON;
      if(searchResult!=="no match"){
        question=searchResult[0][1];
        confidence=searchResult[0][0];
        tempJSON=JSON.parse("{}");
        tempJSON.question=question;
        tempJSON.answer=questions[question];
        tempJSON.confidence=confidence;
      }
      res.send((searchResult=="no match")?searchResult:JSON.stringify(tempJSON));
      //console.log(data);
    });
  }catch(Err){
    console.log(Err);
  }
});
app.get('/api/search/:id', (req, res) => {
  try{
    fs.readFile("questions_and_answers.json", 'utf8', function(err, data) {
      if (err) return console.log(err);
      var questions=JSON.parse(data)[req.params.id];
      //questions.forEach((i)=>{a.add(i)});
      res.send(JSON.stringify(questions));
      //console.log(data);
    });
  }catch(Err){
    console.log(Err);
  }
});
app.get('/api/test', (req, res) => {
  res.send("hello world!");
});
const port = process.env.PORT || 3000;
app.listen(port, () => console.log('server started'));