write/add data in file using express js

Question

I'm trying to write/add data in a json file (for example for each request, a new json is added in the json file) i am using Express.js. I am new to all of this so I really don't know what to do. I'm using a POST request, here's what i got so far. I know it's a big catastrophic mess, i scraped everything that could help me and gathered all of it. I'm just SO lost. Thanks for your help !

app.post('*/', function(req, res) {
  res={
    first_name: req.body.first_name,
    last_name: req.body.last_name,
    reponse1: req.body.reponse1,
    reponse2: req.body.reponse2,
  };
  JSON.stringify(res);
  var body =  {
  table: []
  }; 
  body.table.push(res);
  filePath = __dirname + '/data.json';
  req.on('data', function(data) {
     body += data;
  });

  req.on('end', function (){
    fs.appendFile(filePath, body, function() {
         res.end();
    });
});

});

What happens when you run it. is there any error, whats in console? — Master Po
– Master Po, Commented Apr 16, 2017 at 11:02
no error on the console but i'm using it on a chatbot and they said "Unable to parse JSON" , i think it will work fine with the answer below though ! thank you so much — Liana.R
– Liana.R, Commented Apr 16, 2017 at 17:19

Tolsee · Accepted Answer · 2017-04-16 11:06:10Z

1

In your code, I see a lot of bugs. Firstly, you should not assign res = { }. Secondly, you stringify the JSON data like below. I will also suggest you to go through some tutorials of Node.js first. You can go through https://www.tutorialspoint.com/nodejs/ or https://www.codementor.io/nodejs/tutorial.

For your requirement, you can simply use following code:

const express 	= require('express')
const app     	= express()
const bodyParser= require('body-parser')
const fs 		= require('fs')


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

app.post('/', function(req, res){
	var body = {
	    first_name: req.body.firstName,
	    last_name: req.body.lastName
	}
	filePath = __dirname + '/data.json'

	fs.appendFile(filePath, JSON.stringify(body), function(err) {
		if (err) { throw err }
		res.status(200).json({
			message: "File successfully written"
		})
    })

})

app.listen(3000,function(){
    console.log("Working on port 3000")
})

answered Apr 16, 2017 at 11:06

Tolsee

1,71516 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Liana.R Over a year ago

Thank you so much ! now i receive the error message "Unable to parse JSON" what do you think I should change ?

Liana.R Over a year ago

i can't, there's no error on the console, only when i launch my bot and send a request to my server it gives me that message. But I think it's an issue related to the plateform i use...

Collectives™ on Stack Overflow

write/add data in file using express js

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related