Node.js only reloads a json file on server restart although that should happen dynamically

Question

I have a Post-form in my ejs-template that passes one object via Ajax/post without the page being reloaded. The handler in my app.js then saves the data into a data.json. All of this is working perfectly.

My only concern is that node seems to be requiring the json file only once, I have already tried using setInterval() which made no difference at all. The desired functionality is that the server reloads the data.json after every other submit of my form. Furthermore I have an iframe where the loaded data is displayed. This should happen on the fly therefore without any refresh of the page.

Answer 1

For your above comment socket has nothing to do with it.

To answer your question , you can keep that JSON in memory , creating that object as a global object accessible by every part of code (files).

code example ->

app.js -

global_json = require('../path/myJSON'); //please note that I am not using var here to make it global
//Rest of the code

file1.js -

module.exports = fun(req, res) {
    global_json.something = req.body.something;
//global_json accessible in every file
}

Alternative

If this is not the use case, then you can read and write file in every request (from post), although file reads/writes are slow but wont be the bottle neck in case of node.js server

function formpost(req, res) {
var data = req.body;
fs.writeFile('filename.json', JSON.stringify(data), cb);
}

//And same with reads