Keentune
Adaptive skill practice — find your level, get sharper.

Node.js practice

Master the runtime behind server-side JavaScript
How Node.js really works — the libuv event loop and its phases, microtasks vs timers (process.nextTick, setImmediate), non-blocking I/O and the thread pool, streams and buffers, CommonJS vs ES modules, async patterns and error handling, EventEmitter, worker_threads for CPU-bound work, and building/operating servers. Evergreen fundamentals (reference: Node 24 LTS) that senior backend interviews assume. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
New here? Read the Node.js guide
A free 18-minute primer — the mental model, the mistakes beginners make, and what to practise first.
Curriculum
231 concepts across 26 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.
A. The runtime: what Node adds to JavaScript
7
B. The event loop, timers and scheduling
10
C. The process: arguments, environment and lifecycle
10
D. CommonJS modules
9
E. ESM, package.json and module resolution
10
F. EventEmitter and the event pattern
7
G. Errors and asynchronous failure
10
H. Buffers and binary data
9
I. Streams and backpressure
13
J. Web streams and cross-standard interop
5
K. The file system
11
L. Paths, URLs and name handling
8
M. HTTP servers and clients
10
N. TCP, UDP, TLS and DNS
8
O. Child processes
8
P. worker_threads and multi-process scaling
12
Q. Cancellation and asynchronous context
8
R. Cryptography
10
S. The permission model and hardening
7
T. Diagnostics, profiling and memory
10
U. Testing with node:test
9
V. The CLI, flags and configuration
8
W. Modern Node: TypeScript, SQLite, packaging and releases
10
X. The rest of the standard toolkit
6
Y. HTTP/2
10
Z. Reading input line by line
6
View the full curriculum →
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