| Name | Lines of code | Maintainability | Test coverage |
| lib/events.js | 225 | D 2 days | |
| lib/freelist.js | 18 | A 0 mins | |
| lib/fs.js | 1,412 | F 2 wks | |
| lib/http.js | 73 | A 1 hr | |
| lib/https.js | 93 | A 2 hrs | |
| lib/module.js | 335 | D 1 day | |
| lib/net.js | 1,029 | F 1 wk | |
| lib/os.js | 37 | A 1 hr | |
| lib/path.js | 408 | F 4 days | |
| lib/punycode.js | 273 | C 1 day | |
| lib/querystring.js | 159 | C 1 day | |
| lib/readline.js | 940 | F 1 wk | |
| lib/repl.js | 671 | F 1 wk | |
| lib/smalloc.js | 55 | A 35 mins | |
| lib/stream.js | 70 | B 4 hrs | |
| lib/string_decoder.js | 116 | B 5 hrs | |
| lib/sys.js | 2 | A 0 mins | |
| lib/timers.js | 367 | D 2 days | |
| lib/tls.js | 153 | C 1 day | |
| lib/tty.js | 85 | A 0 mins | |
| lib/url.js | 504 | F 1 wk | |
| lib/util.js | 551 | F 5 days | |
| lib/vm.js | 37 | A 0 mins | |
| lib/zlib.js | 456 | F 5 days | |
| node.gyp | |||
| src/async-wrap-inl.h | |||
| src/async-wrap.cc | |||
| src/async-wrap.h | |||
| src/base-object-inl.h | |||
| src/base-object.h | |||
| src/cares_wrap.cc | |||
| src/env-inl.h | |||
| src/env.h | |||
| src/fs_event_wrap.cc | |||
| src/handle_wrap.cc | |||
| src/handle_wrap.h | |||
| src/node.cc | |||
| src/node.d | |||
| src/node.h | |||
| src/node.js | 559 | F 3 days | |
| src/node.stp | |||
| src/node_buffer.cc | |||
| src/node_buffer.h | |||
| src/node_constants.cc | |||
| src/node_constants.h | |||
| src/node_contextify.cc | |||
| src/node_counters.cc | |||
| src/node_counters.h | |||
| src/node_crypto.cc | |||
| src/node_crypto.h |