| Number | Module | Description |
| 1 | assert | Provides a set of assertion tests |
| 2 | buffer | To handle binary data |
| 3 | child_process | To run a child process |
| 4 | cluster | To split a single Node process into multiple processes |
| 5 | crypto | To handle OpenSSL cryptographic functions |
| 6 | dgram | Provides implementation of UDP datagram sockets |
| 7 | dns | To do DNS lookups and name resolution functions |
| 8 | domain | Deprecated. To handle unhandled errors |
| 9 | events | To handle events |
| 10 | fs | To handle the file system |
| 11 | http | To make Node.js act as an HTTP server |
| 12 | https | To make Node.js act as an HTTPS server. |
| 13 | net | To create servers and clients |
| 14 | os | Provides information about the operation system |
| 15 | path | To handle file paths |
| 16 | punycode | Deprecated. A character encoding scheme |
| 17 | querystring | To handle URL query strings |
| 18 | readline | To handle readable streams one line at the time
|
| 19 | stream | To handle streaming data |
| 20 | string_decoder | To decode buffer objects into strings |
| 21 | timers | To execute a function after a given number of milliseconds |
| 22 | tls | To implement TLS and SSL protocols |
| 23 | tty | Provides classes used by a text terminal |
| 24 | url | To parse URL strings |
| 25 | util | To access utility functions |
| 26 | v8 | To access information about V8 (the JavaScript engine) |
| 27 | vm | To compile JavaScript code in a virtual machine |
| 28 | zlib | To compress or decompress files |