Node.js Global Objects

Node.js global objects are global in nature and available in all modules. You don’t need to include these objects in your application; rather they can be used directly. These objects are modules, functions, strings and object etc. Some of these objects aren’t actually in the global scope but in the module scope.

A list of Node.js global objects are given below:

• __dirname
• __filename
• Console
• Process
• Buffer
• setImmediate(callback[, arg][, …])
• setInterval(callback, delay[, arg][, …])
• setTimeout(callback, delay[, arg][, …])
• clearImmediate(immediateObject)
• clearInterval(intervalObject)
• clearTimeout(timeoutObject)

Node.js __dirname

It is a string. It specifies the name of the directory that currently contains the code.

File: global-example1.js

console.log(__dirname);   

Open Node.js command prompt and run the following code:

node global-example1.js   

Node.js __filename

It specifies the filename of the code being executed. This is the resolved absolute path of this code file. The value inside a module is the path to that module file.

File: global-example2.js

console.log(__filename);   

Open Node.js command prompt and run the following code:

node global-example2.js