Node.js Global Objects
When working with Node.js, you’ll often come across global objects. These are built-in objects available across all modules in a Node.js application. The best part? You don’t need to explicitly import them—they can be used directly.
These global objects include modules, functions, strings, and objects that simplify working with Node.js. However, note that some of these objects are not strictly in the “global scope” but exist within the module scope.
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Common Node.js Global Objects
Here’s a list of widely used global objects in Node.js:
__dirname__filenameConsoleProcessBuffersetImmediate(callback[, arg][, ...])setInterval(callback, delay[, arg][, ...])setTimeout(callback, delay[, arg][, ...])clearImmediate(immediateObject)clearInterval(intervalObject)clearTimeout(timeoutObject)
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Node.js __dirname
__dirname is a string representing the absolute path of the directory that holds the currently executing script.
Example (global-example1.js):
console.log(__dirname);
Run this script in Node.js:
node global-example1.js
This will print the directory path of your file.
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Node.js __filename
__filename provides the absolute path of the file being executed. Inside a module, it returns the complete path to that module file.
Example (global-example2.js):
console.log(__filename);
Run this script:
node global-example2.js
You’ll get the exact file path of the script being executed.
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Node.js Console
For a detailed explanation of the Console class in Node.js, check here:
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Final Thoughts
Node.js global objects make coding easier by providing direct access to useful values and methods without requiring imports. As you build applications, getting comfortable with these will save you both time and effort.
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