server.js

const express = require('express'),
    app = express(),
    mongoose = require('mongoose')

mongoose.connect("mongodb://localhost/test")

const userSchema = new mongoose.Schema({
    username: { type: String, required: true, unique: true },
    password: { type: String, required: true },
    email: { type: String, required: true },
    created_at: Date,
    updated_at: Date
})

userSchema.index({username: 'text'}, {name: 'guyugugygu', weights: {username: 1}});

const User = mongoose.model('User', userSchema)

app.use(express.static(__dirname + '/'))

app.get('/', (req, res) => {
    res.sendFile(__dirname + '/toto.html')
})

app.get('/search/:query', (req, res) => {
    const query = req.params.query

    User.find({ $text: { $search: query } }).exec((err, items) => {
        if (err) {
            res.status(404).json(err)
        } else {
            res.status(200).json(items)
        }
    })
})

app.listen(3000, () => {
    console.log('http://localhost:3000')
})