Builtin modules

Built-in modules are already installed with Node.js, so you don’t need to install them with any package manager (yarn, npm, etc.).

• fs: dealing with the system files.
• os: provides information about the operation system.
• net: to build clients and servers.
• path: to handle file paths.
• url: help in parsing URL strings.
• http: making Node.js transfer data over HTTP.
• console: to log information in the console.
• assert: provides a set of assertion tests.
• process: provides information about, and control over, the current process.
• cluster: able to creating child processes that runs simultaneously and share the same server port.
• perf_hooks: provides APIs for performance measurement
• crypto: to handle OpenSSL cryptographic functions.
• Buffer: provides APIs to handling streams of binary data.
• DNS: enables name resolution.
• events: for handling existing events and creating custom events.
• child_processes: provides the ability to spawn subprocesses.
• REPL: provides a Read-Eval-Print-Loop (REPL) implementation that is available both as a standalone program or includible in other applications.
• readline: provides an interface for reading data from a Readable stream one line at a time.
• util: supports the needs of Node.js internal APIs.
• querystring: provides utilities for parsing and formatting URL query strings.
• string_decoder: provides an API for decoding Buffer objects into strings.
• tls: provides an implementation of the Transport Layer Security (TLS) and Secure Socket Layer (SSL) protocols.

Visit the following resources to learn more:

• API documentation of Built-in modules
• Built-in modules - w3schools