This should make it work as required,

• Added ES6 Syntax
• Added Error Handling

const express = require('express'); const app = express(); const fs = require("fs"); app.get('/listUsers', (req, res) => { fs.readFile('user.json', (err,data) => { if(err) res.status(500).send(err.message) else { let displayData = JSON.parse(data); //console.log(displayData) res.status(200).send(displayData); } }); }) app.listen(8081,() => console.log("Example app listening at port 8081")) 

This should make it work as required,

• Added ES6 Syntax
• Added Error Handling

const express = require('express'); const app = express(); const fs = require("fs"); app.get('/listUsers', (req, res) => { fs.readFile('user.json', (err,data) => { if(err) res.status(500).send(err.message) else { let displayData = JSON.parse(data); //console.log(displayData) res.status(200).send(displayData); } }); }) app.listen(8081,() => console.log("Example app listening at port 8081")) 

Without using fs

const user = require('./user.json') app.get('/listUsers', (req, res) => { res.send(user); })