The exports object becomes complete when Node finishes loading the module (and labels it so). Make this index.js file require lib/util.js: Note how the main index module (id: '.') Without seeing the actual file(s) that you are accessing, I might guess that your json file may not be pure JSON. We can’t actually do that because the exports variable inside each module is just a reference to module.exports which manages the exported properties. With strict mode, you can not, for example, use undeclared variables. On the plus side, using a ".js" file means you don't have to use strict JSON format. At InVision App, we're hiring a lot of Node.js developers. If you want to only resolve the module and not execute it, you can use the require.resolve function. 2011-08-26 Node.js follows the CommonJS module system, and the builtin require function is the easiest way to include modules that exist in separate files. At this point, you might be thinking that being able to require a .json file is nice; but, that you don't want to paint yourself into a "static" corner. It will still throw an error if the file does not exist and it will return the full path to the file when found. We can, for example, see the index.js module fully loaded if we print its module object on the next cycle of the event loop using a setImmediate call: Note how in this delayed console.log output both lib/util.js and index.js are fully loaded. This is where we can use this simple if statement: So we can use this condition to satisfy the usage requirements above by invoking the printInFrame function differently: When the file is not being required, we just call the printInFrame function with process.argv elements. Hence: { foo: 'blah', bar: foo + '/blah.html' // this must be an HTML file}, { "foo": "blah", "bar": "blah/blah.html"}. It is not a statement, but a literal expression, ignored by earlier versions of JavaScript. I haven't done too much "production" node.js stuff yet; but, I think our team uses something similarish. require("@donvawter/dvconfigure")app,__dirname+"/common_config.json",__dirname+"/app_config.json").then(....).catch(...). Before proceeding with this tutorial, you should have a basic understanding of HTML, CSS, JavaScript, Document Object Model (DOM) and any text editor. The module.exports object in every module is what the require function returns when we require that module. When we define a variable in one module, the other modules in the program will not have access to that variable. The key here is that, whatever value has module.exports will be the value when using require. As such, I wanted to put together a quick demo. We can also create a find-me folder under node_modules and place an index.js file in there. Where Does Node.js And Require() Look For Modules. Except when they weren’t, and used use or some other freakish statements to reference functions in other files. At its core, jQuery is used to connect with HTML elements in the browser via the DOM. 3000:... var request = require('request-json');var client = request.createClient('http://localhost:4000/'); ... 4000:app.get('/Teste2', function(req, res){ var jsonmsg= {"MSg":"teste"}; res.json(jsonmsg);}). This is where we get into what’s known as the circular modular dependency, which is allowed in Node. Assuming the required module will export the printInFrame function and we can just call it: To print the header “Hey” in a frame of 5 stars. Donations to freeCodeCamp go toward our education initiatives, and help pay for servers, services, and staff. One on port 3000 and the other modules in the 3000 console and its directory path are! Module and not execute any code you write in a file extension to do after one cycle the. To do and not execute any code you write in a closure ) working for.js file keeping functions …... 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