This code illustrates how to use fuse.js in cloud functions

fuse_js_based_text_search_code_sample.js

const Fuse = require("fuse.js");
// The Cloud Functions for Firebase SDK to create Cloud Functions and setup triggers.
const functions = require('firebase-functions');
 
// The Firebase Admin SDK to access the Firebase Realtime Database.
const admin = require('firebase-admin');
admin.initializeApp();
 
 
 
SearchEngine = {
 
  textSearch:(data,search_text,_keys=[],should_sort=false,_threshold=0.2,_location=0,_distance=100,max_pattern_length=32,min_match_charlength=1)=>{
    let newData = data;
    if(search_text !== undefined && search_text!==""){
 
    let options = {
      shouldSort: should_sort,
      threshold: _threshold,
      location: _location,
      distance: _distance,
      maxPatternLength: max_pattern_length,
      minMatchCharLength: min_match_charlength,
      keys:_keys};
 
      let fuse = new Fuse(newData, options);
      newData = fuse.search(search_text);
  }
 
  return newData
  }
}
 
 
exports.search_engine = functions.https.onRequest(async(req,res)=>{
 
  let events = await admin.database().ref(`events/`).once("value").then(snapshot=>snapshot.val());
  let eventsData = Object.values(events);
 
  let text_search = req.query.text_search;
 
  if(text_search !== "" && text_search !== "null" && text_search !== "undefined" && text_search !== null && text_search !== undefined){
    if(eventsData.length !== 0){
    eventsData = SearchEngine.textSearch(eventsData,text_search,["event_title","address","city","country"]);
    }
  }
 
  res.set('Access-Control-Allow-Origin', '*').status(200).send(eventsData)// make sure to include ('Access-Control-Allow-Origin','*') //or you might face cors problem
 
})