{"id":31521,"date":"2026-10-28T08:00:00","date_gmt":"2026-10-28T01:00:00","guid":{"rendered":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/?p=31521"},"modified":"2026-10-28T17:19:19","modified_gmt":"2026-10-28T10:19:19","slug":"cau-hoi-phong-van-node-js","status":"publish","type":"post","link":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/phong-van-viec-lam\/cau-hoi-phong-van-node-js","title":{"rendered":"C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Node.js: event loop, async, hi\u1ec7u n\u0103ng v\u00e0 b\u1ea3o m\u1eadt"},"content":{"rendered":"

Nhi\u1ec1u \u1ee9ng vi\u00ean L\u1eadp tr\u00ecnh vi\u00ean Node.js (Node.js Developer) thu\u1ed9c \u0111\u1ecbnh ngh\u0129a nh\u01b0ng l\u00fang t\u00fang khi b\u1ecb h\u1ecfi v\u00ec sao API ch\u1eadm d\u1ea7n. B\u00e0i vi\u1ebft gom c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Node.js<\/strong> theo n\u0103m l\u1edbp k\u1ef9 thu\u1eadt: runtime, b\u1ea5t \u0111\u1ed3ng b\u1ed9, hi\u1ec7u n\u0103ng, framework v\u00e0 b\u1ea3o m\u1eadt. M\u1ed7i c\u00e2u k\u00e8m \u0111i\u1ec1u nh\u00e0 tuy\u1ec3n d\u1ee5ng mu\u1ed1n ki\u1ec3m tra v\u00e0 \u00fd tr\u1ea3 l\u1eddi c\u1ed1t l\u00f5i, kh\u00f4ng ph\u1ea3i \u0111\u00e1p \u00e1n m\u1eabu.<\/p>\n

\"c\u00e2u<\/p>\n

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T\u1ed5ng quan nhanh<\/strong><\/p>\n

\u2013 C\u00e2u “Node.js \u0111\u01a1n lu\u1ed3ng sao ch\u1ecbu t\u1ea3i cao” l\u00e0 c\u00e2u l\u1ecdc \u1edf v\u00f2ng k\u1ef9 thu\u1eadt.<\/p>\n

\u2013 Th\u1ee9 t\u1ef1 ch\u1ea1y c\u1ee7a nextTick, Promise v\u00e0 setImmediate th\u01b0\u1eddng \u0111\u01b0\u1ee3c h\u1ecfi k\u00e8m code.<\/p>\n

\u2013 Nh\u00f3m hi\u1ec7u n\u0103ng xoay quanh t\u00e1c v\u1ee5 CPU-bound, worker_threads v\u00e0 Streams.<\/p>\n

\u2013 V\u00f2ng live coding hay l\u00e0 b\u00e0i s\u1eeda code ngh\u1ebdn event loop ho\u1eb7c qu\u00ean await.<\/p>\n

B\u1ed1n \u00fd n\u00e0y \u0111\u01b0\u1ee3c tri\u1ec3n khai l\u1ea7n l\u01b0\u1ee3t t\u1eeb l\u1edbp runtime \u0111\u1ebfn v\u00f2ng th\u1ef1c h\u00e0nh.<\/p>\n<\/div>\n

1. L\u1edbp runtime: event loop, libuv v\u00e0 c\u00e2u h\u1ecfi “\u0111\u01a1n lu\u1ed3ng”<\/h2>\n

Ng\u01b0\u1eddi ph\u1ecfng v\u1ea5n th\u01b0\u1eddng m\u1edf \u0111\u1ea7u b\u1eb1ng runtime v\u00ec \u0111\u00e2y l\u00e0 n\u1ec1n c\u1ee7a m\u1ecdi c\u00e2u sau. Ph\u1ea7n \u0111\u1ecbnh ngh\u0129a \u0111\u00e3 c\u00f3 trong b\u00e0i Node.js l\u00e0 g\u00ec? \u01afu, nh\u01b0\u1ee3c \u0111i\u1ec3m v\u00e0 c\u00e1ch \u1ee9ng d\u1ee5ng trong th\u1ef1c t\u1ebf<\/a>, n\u00ean \u1edf \u0111\u00e2y ch\u1ec9 b\u00e0n c\u01a1 ch\u1ebf ch\u1ea1y b\u00ean trong. Tr\u1ea3 l\u1eddi “v\u00ec Node nhanh” g\u1ea7n nh\u01b0 b\u1ecb tr\u1eeb \u0111i\u1ec3m. M\u1ed9t c\u00e2u m\u1edf m\u00e0n quen thu\u1ed9c kh\u00e1c l\u00e0 ph\u00e2n bi\u1ec7t blocking v\u00e0 non-blocking: blocking ngh\u0129a l\u00e0 lu\u1ed3ng ch\u00ednh d\u1eebng ch\u1edd m\u1ed9t thao t\u00e1c xong m\u1edbi ch\u1ea1y ti\u1ebfp, c\u00f2n non-blocking giao thao t\u00e1c cho h\u1ec7 \u0111i\u1ec1u h\u00e0nh r\u1ed3i x\u1eed l\u00fd k\u1ebft qu\u1ea3 qua callback. N\u1eafm r\u00f5 c\u1eb7p kh\u00e1i ni\u1ec7m n\u00e0y gi\u00fap c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Node.js v\u1ec1 sau d\u1ec5 tr\u1ea3 l\u1eddi m\u1ea1ch l\u1ea1c h\u01a1n.<\/p>\n

Node.js \u0111\u01a1n lu\u1ed3ng hay \u0111a lu\u1ed3ng?<\/h3>\n

\u00dd tr\u1ea3 l\u1eddi c\u1ea7n t\u00e1ch hai l\u1edbp. M\u00e3 JavaScript ch\u1ea1y tr\u00ean m\u1ed9t lu\u1ed3ng ch\u00ednh, c\u00f2n th\u01b0 vi\u1ec7n libuv c\u00f3 thread pool (m\u1eb7c \u0111\u1ecbnh 4 lu\u1ed3ng, ch\u1ec9nh b\u1eb1ng UV_THREADPOOL_SIZE<\/code>) cho vi\u1ec7c \u0111\u1ecdc file, dns.lookup<\/code>, m\u00e3 h\u00f3a v\u00e0 n\u00e9n. I\/O m\u1ea1ng d\u1ef1a v\u00e0o c\u01a1 ch\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9 c\u1ee7a h\u1ec7 \u0111i\u1ec1u h\u00e0nh nh\u01b0 epoll hay kqueue. Lu\u1ed3ng ch\u00ednh kh\u00f4ng \u0111\u1ee9ng ch\u1edd I\/O n\u00ean m\u1ed9t ti\u1ebfn tr\u00ecnh ph\u1ee5c v\u1ee5 \u0111\u01b0\u1ee3c nhi\u1ec1u k\u1ebft n\u1ed1i, h\u1ee3p v\u1edbi API hay chat th\u1eddi gian th\u1ef1c.<\/p>\n

Event loop v\u00e0 th\u1ee9 t\u1ef1 nextTick, setImmediate<\/h3>\n

B\u1ea1n n\u00ean k\u1ec3 c\u00e1c phase ch\u00ednh theo t\u00e0i li\u1ec7u tr\u00ean nodejs.org: timers, pending callbacks, poll, check v\u00e0 close callbacks. Ng\u01b0\u1eddi h\u1ecfi hay \u0111\u01b0a \u0111o\u1ea1n code v\u00e0 y\u00eau c\u1ea7u \u0111o\u00e1n th\u1ee9 t\u1ef1 in ra. \u00dd c\u1ed1t l\u00f5i: h\u00e0ng \u0111\u1ee3i process.nextTick<\/code> ch\u1ea1y tr\u01b0\u1edbc microtask c\u1ee7a Promise, c\u1ea3 hai xong tr\u01b0\u1edbc khi event loop sang phase k\u1ebf. setImmediate<\/code> thu\u1ed9c phase check, setTimeout(fn, 0)<\/code> thu\u1ed9c phase timers; \u1edf module ch\u00ednh th\u1ee9 t\u1ef1 hai h\u00e0m n\u00e0y c\u00f3 th\u1ec3 \u0111\u1ed5i, nh\u01b0ng trong callback I\/O th\u00ec setImmediate<\/code> ch\u1ea1y tr\u01b0\u1edbc.<\/p>\n

2. L\u1edbp b\u1ea5t \u0111\u1ed3ng b\u1ed9: t\u1eeb callback \u0111\u1ebfn async\/await<\/h2>\n

Nh\u00f3m c\u00e2u n\u00e0y ki\u1ec3m tra b\u1ea1n vi\u1ebft code b\u1ea5t \u0111\u1ed3ng b\u1ed9 d\u1ec5 \u0111\u1ecdc, kh\u00f4ng l\u00e0m s\u1eadp ti\u1ebfn tr\u00ecnh. Khi \u0111\u1ecdc tin trong m\u1ee5c vi\u1ec7c l\u00e0m CNTT – ph\u1ea7n m\u1ec1m<\/a>, b\u1ea1n s\u1ebd th\u1ea5y async\/await, x\u1eed l\u00fd l\u1ed7i v\u00e0 kinh nghi\u1ec7m vi\u1ebft API th\u01b0\u1eddng \u0111\u1ee9ng c\u1ea1nh nhau \u1edf ph\u1ea7n y\u00eau c\u1ea7u. Ng\u01b0\u1eddi ph\u1ecfng v\u1ea5n Node.js \u00edt h\u1ecfi \u0111\u1ecbnh ngh\u0129a Promise m\u00e0 h\u1ecfi c\u00e1ch x\u1eed l\u00fd l\u1ed7i khi nhi\u1ec1u t\u00e1c v\u1ee5 ch\u1ea1y song song, v\u00e0 c\u00e2u tr\u1ea3 l\u1eddi t\u1ed1t n\u00ean g\u1eafn v\u1edbi t\u00ecnh hu\u1ed1ng b\u1ea1n t\u1eebng g\u1eb7p.<\/p>\n

\u2013 Callback, Promise v\u00e0 async\/await kh\u00e1c nhau th\u1ebf n\u00e0o v\u1ec1 c\u00e1ch \u0111\u1ecdc code v\u00e0 b\u1eaft l\u1ed7i?<\/p>\n

\u2013 Khi n\u00e0o b\u1ea1n d\u00f9ng Promise.all, khi n\u00e0o d\u00f9ng Promise.allSettled cho nhi\u1ec1u t\u00e1c v\u1ee5?<\/p>\n

\u2013 H\u00e0m async c\u00f3 gi\u00fap v\u00f2ng l\u1eb7p t\u00ednh to\u00e1n n\u1eb7ng kh\u00f4ng ch\u1eb7n event loop kh\u00f4ng?<\/p>\n

C\u00e2u cu\u1ed1i l\u00e0 b\u1eaby: async ch\u1ec9 \u0111\u1ed5i c\u00e1ch vi\u1ebft, v\u00f2ng l\u1eb7p v\u1eabn ch\u1eb7n lu\u1ed3ng ch\u00ednh. V\u1edbi Promise b\u1ecb reject kh\u00f4ng c\u00f3 catch, c\u00e1c b\u1ea3n Node.js g\u1ea7n \u0111\u00e2y m\u1eb7c \u0111\u1ecbnh d\u1eebng ti\u1ebfn tr\u00ecnh, n\u00ean h\u00e3y nh\u1eafc try\/catch v\u00e0 middleware b\u1eaft l\u1ed7i t\u1eadp trung.<\/p>\n

3. L\u1edbp hi\u1ec7u n\u0103ng: worker_threads, cluster v\u00e0 Streams<\/h2>\n

C\u00e2u h\u1ecfi th\u01b0\u1eddng b\u1eaft \u0111\u1ea7u t\u1eeb tri\u1ec7u ch\u1ee9ng: “API ch\u1eadm khi nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng c\u00f9ng l\u00fac, b\u1ea1n t\u00ecm nguy\u00ean nh\u00e2n th\u1ebf n\u00e0o?”. \u00dd tr\u1ea3 l\u1eddi n\u00ean \u0111i theo tr\u00ecnh t\u1ef1 \u0111o tr\u01b0\u1edbc, s\u1eeda sau. B\u1ea1n theo d\u00f5i \u0111\u1ed9 tr\u1ec5 event loop, ch\u1ea1y profiler qua c\u1edd --inspect<\/code>, ki\u1ec3m tra truy v\u1ea5n database, r\u1ed3i m\u1edbi t\u00e1ch t\u00e1c v\u1ee5. Ng\u01b0\u1eddi h\u1ecfi \u0111\u00e1nh gi\u00e1 cao vi\u1ec7c lo\u1ea1i tr\u1eeb nguy\u00ean nh\u00e2n thay v\u00ec \u0111o\u00e1n.<\/p>\n

Worker threads ch\u1ea1y t\u00e1c v\u1ee5 CPU-bound nh\u01b0 x\u1eed l\u00fd \u1ea3nh tr\u00ean lu\u1ed3ng ri\u00eang trong c\u00f9ng ti\u1ebfn tr\u00ecnh. Cluster t\u1ea1o nhi\u1ec1u ti\u1ebfn tr\u00ecnh \u0111\u1ec3 d\u00f9ng nhi\u1ec1u nh\u00e2n CPU; trong container, vi\u1ec7c n\u00e0y th\u01b0\u1eddng do PM2 ho\u1eb7c Kubernetes \u0111\u1ea3m nh\u1eadn. V\u1edbi Streams, h\u00e3y k\u1ec3 b\u1ed1n lo\u1ea1i Readable, Writable, Duplex, Transform v\u00e0 gi\u1ea3i th\u00edch backpressure: b\u00ean ghi ch\u1eadm h\u01a1n b\u00ean \u0111\u1ecdc th\u00ec d\u1eef li\u1ec7u d\u1ed3n v\u00e0o b\u1ed9 nh\u1edb, d\u00f9ng pipeline()<\/code> \u0111\u1ec3 t\u1ef1 \u0111i\u1ec1u ti\u1ebft.<\/p>\n

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L\u01b0u \u00fd khi tr\u1ea3 l\u1eddi nh\u00f3m hi\u1ec7u n\u0103ng<\/strong><\/p>\n

\u2013 B\u1ea1n kh\u00f4ng n\u00ean tr\u1ea3 l\u1eddi “t\u0103ng c\u1ea5u h\u00ecnh server” tr\u01b0\u1edbc khi n\u00eau c\u00e1ch \u0111o nguy\u00ean nh\u00e2n.<\/p>\n

\u2013 B\u1ea1n n\u00ean k\u1ec3 ngu\u1ed3n r\u00f2 r\u1ec9 b\u1ed9 nh\u1edb nh\u01b0 cache kh\u00f4ng gi\u1edbi h\u1ea1n v\u00e0 listener kh\u00f4ng g\u1ee1.<\/p>\n

\u2013 B\u1ea1n \u0111\u1eebng \u0111\u1ec1 xu\u1ea5t worker_threads cho t\u00e1c v\u1ee5 I\/O v\u00ec lu\u1ed3ng ch\u00ednh v\u1ed1n kh\u00f4ng ch\u1edd I\/O.<\/p>\n

Ba l\u01b0u \u00fd n\u00e0y cho th\u1ea5y b\u1ea1n x\u1eed l\u00fd hi\u1ec7u n\u0103ng b\u1eb1ng d\u1eef li\u1ec7u ch\u1ee9 kh\u00f4ng b\u1eb1ng ph\u1ecfng \u0111o\u00e1n.<\/p>\n<\/div>\n

N\u1ebfu t\u1eebng so s\u00e1nh hai heap snapshot \u0111\u1ec3 t\u00ecm r\u00f2 r\u1ec9, h\u00e3y k\u1ec3 ng\u1eafn g\u1ecdn tr\u1ea3i nghi\u1ec7m \u0111\u00f3.<\/p>\n

4. L\u1edbp framework, API v\u00e0 b\u1ea3o m\u1eadt<\/h2>\n

Nh\u00e0 tuy\u1ec3n d\u1ee5ng mu\u1ed1n bi\u1ebft b\u1ea1n \u0111\u00e3 x\u00e2y API ch\u1ea1y th\u1eadt hay ch\u1ec9 l\u00e0m b\u00e0i h\u01b0\u1edbng d\u1eabn. V\u1edbi Express, c\u00e2u quen thu\u1ed9c l\u00e0 middleware ch\u1ea1y theo th\u1ee9 t\u1ef1 n\u00e0o v\u00e0 v\u00ec sao middleware b\u1eaft l\u1ed7i c\u1ea7n b\u1ed1n tham s\u1ed1. NestJS th\u00ec hay h\u1ecfi dependency injection v\u00e0 guard. C\u00e2u REST hay GraphQL kh\u00f4ng c\u00f3 \u0111\u00e1p \u00e1n chung cho m\u1ecdi tr\u01b0\u1eddng h\u1ee3p, b\u1ea1n c\u1ea7n n\u00eau b\u00e0i to\u00e1n h\u1ee3p v\u1edbi m\u1ed7i ki\u1ec3u. Ph\u1ea7n b\u1ea3o m\u1eadt th\u01b0\u1eddng \u0111\u1ed1i chi\u1ebfu v\u1edbi danh m\u1ee5c OWASP Top 10 b\u1ea3n hi\u1ec7n h\u00e0nh.<\/p>\n\n\n\n\n\n\n\n\n\n\n
C\u00e2u h\u1ecfi<\/th>\nKi\u1ec3m tra g\u00ec<\/th>\n\u00dd tr\u1ea3 l\u1eddi c\u1ed1t l\u00f5i<\/th>\n<\/tr>\n
\u0110\u01a1n lu\u1ed3ng sao ch\u1ecbu t\u1ea3i cao?<\/td>\nLu\u1ed3ng JS v\u00e0 thread pool<\/td>\nLu\u1ed3ng ch\u00ednh kh\u00f4ng ch\u1edd I\/O<\/td>\n<\/tr>\n
nextTick kh\u00e1c setImmediate?<\/td>\nTh\u1ee9 t\u1ef1 h\u00e0ng \u0111\u1ee3i<\/td>\nnextTick tr\u01b0\u1edbc microtask, setImmediate \u1edf phase check<\/td>\n<\/tr>\n
Async c\u00f3 ch\u1ed1ng ngh\u1ebdn t\u00e1c v\u1ee5 n\u1eb7ng?<\/td>\nC\u00fa ph\u00e1p v\u00e0 c\u01a1 ch\u1ebf<\/td>\nKh\u00f4ng, c\u1ea7n worker_threads<\/td>\n<\/tr>\n
Reject kh\u00f4ng c\u00f3 catch?<\/td>\n\u0110\u1ed9 \u1ed5n \u0111\u1ecbnh<\/td>\nTi\u1ebfn tr\u00ecnh c\u00f3 th\u1ec3 d\u1eebng<\/td>\n<\/tr>\n
\u0110\u1ecdc file v\u00e0i GB?<\/td>\nStreams, backpressure<\/td>\nD\u00f9ng pipeline, kh\u00f4ng \u0111\u1ecdc c\u1ea3 file<\/td>\n<\/tr>\n
worker_threads hay cluster?<\/td>\nCh\u1ecdn \u0111\u00fang c\u00f4ng c\u1ee5<\/td>\nLu\u1ed3ng cho CPU-bound, ti\u1ebfn tr\u00ecnh cho nhi\u1ec1u nh\u00e2n<\/td>\n<\/tr>\n
B\u1ea3o v\u1ec7 API \u0111\u0103ng nh\u1eadp?<\/td>\nR\u1ee7i ro th\u01b0\u1eddng g\u1eb7p<\/td>\nJWT h\u1ea1n ng\u1eafn, rate limit, ki\u1ec3m tra \u0111\u1ea7u v\u00e0o<\/td>\n<\/tr>\n
Qu\u1ea3n l\u00fd th\u01b0 vi\u1ec7n ph\u1ee5 thu\u1ed9c?<\/td>\nChu\u1ed7i cung \u1ee9ng ph\u1ea7n m\u1ec1m<\/td>\nCommit package-lock.json, ch\u1ea1y npm audit<\/td>\n<\/tr>\n<\/table>\n

B\u1ea3ng ch\u1ec9 l\u00e0 khung \u00f4n t\u1eadp; khi tr\u1ea3 l\u1eddi, h\u00e3y th\u00eam v\u00ed d\u1ee5 t\u1eeb d\u1ef1 \u00e1n th\u1eadt.<\/p>\n

\"c\u00e2u<\/p>\n

5. V\u00f2ng live coding: \u0111\u1ecdc v\u00e0 s\u1eeda code ngh\u1ebdn event loop<\/h2>\n

Nhi\u1ec1u n\u01a1i kh\u00f4ng y\u00eau c\u1ea7u vi\u1ebft thu\u1eadt to\u00e1n m\u00e0 \u0111\u01b0a m\u1ed9t \u0111o\u1ea1n code l\u1ed7i \u0111\u1ec3 b\u1ea1n s\u1eeda. L\u1ed7i hay g\u1eb7p l\u00e0 qu\u00ean await<\/code> khi\u1ebfn h\u00e0m tr\u1ea3 v\u1ec1 tr\u01b0\u1edbc khi ghi database xong, ho\u1eb7c v\u00f2ng l\u1eb7p \u0111\u1ed3ng b\u1ed9 l\u00e0m m\u1ecdi request \u0111\u1ee9ng ch\u1edd. Ng\u01b0\u1eddi ph\u1ecfng v\u1ea5n quan s\u00e1t c\u00e1ch b\u1ea1n \u0111\u1eb7t gi\u1ea3 thuy\u1ebft, th\u00eam log, ch\u1ea1y th\u1eed r\u1ed3i m\u1edbi s\u1eeda. K\u1ef9 n\u0103ng \u0111\u1ecdc code ng\u01b0\u1eddi kh\u00e1c v\u00ec v\u1eady quan tr\u1ecdng kh\u00f4ng k\u00e9m vi\u1ebft m\u1edbi.<\/p>\n

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\u1ee8ng vi\u00ean v\u01b0\u1ee3t v\u00f2ng live coding th\u01b0\u1eddng l\u00e0 ng\u01b0\u1eddi n\u00f3i ra suy ngh\u0129 khi g\u1ee1 l\u1ed7i, kh\u00f4ng ph\u1ea3i ng\u01b0\u1eddi g\u00f5 nhanh.<\/em><\/p>\n<\/blockquote>\n

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L\u1eddi khuy\u00ean luy\u1ec7n t\u1eadp<\/strong><\/p>\n

\u2013 B\u1ea1n h\u00e3y m\u1edf l\u1ea1i d\u1ef1 \u00e1n c\u0169 v\u00e0 t\u1ef1 t\u00ecm ch\u1ed7 thi\u1ebfu await ho\u1eb7c thi\u1ebfu b\u1eaft l\u1ed7i.<\/p>\n

\u2013 B\u1ea1n n\u00ean vi\u1ebft m\u1ed9t v\u00f2ng l\u1eb7p n\u1eb7ng, \u0111o \u0111\u1ed9 tr\u1ec5 r\u1ed3i chuy\u1ec3n n\u00f3 sang worker_threads.<\/p>\n

\u2013 B\u1ea1n h\u00e3y t\u1eadp gi\u1ea3i th\u00edch th\u00e0nh ti\u1ebfng t\u1eebng b\u01b0\u1edbc khi \u0111\u1ecdc code c\u1ee7a ng\u01b0\u1eddi kh\u00e1c.<\/p>\n

Ba b\u00e0i t\u1eadp n\u00e0y gi\u00fap ph\u1ea3n x\u1ea1 g\u1ee1 l\u1ed7i t\u1ef1 nhi\u00ean h\u01a1n khi c\u00f3 ng\u01b0\u1eddi quan s\u00e1t.<\/p>\n<\/div>\n

Luy\u1ec7n c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Node.js theo c\u00e1ch n\u00e0y gi\u00fap b\u1ea1n chu\u1ea9n b\u1ecb c\u1ea3 h\u1ecfi \u0111\u00e1p l\u1eabn th\u1ef1c h\u00e0nh.<\/p>\n

6. C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n

1. Ph\u1ecfng v\u1ea5n Node.js c\u00f3 h\u1ecfi thu\u1eadt to\u00e1n kh\u00f4ng?<\/em><\/strong> C\u00f3 th\u1ec3 c\u00f3, nh\u01b0ng nhi\u1ec1u v\u1ecb tr\u00ed backend \u01b0u ti\u00ean b\u00e0i debug v\u00e0 thi\u1ebft k\u1ebf API.<\/p>\n

2. N\u00ean \u00f4n phi\u00ean b\u1ea3n Node.js n\u00e0o?<\/em><\/strong> H\u00e3y \u00f4n theo b\u1ea3n LTS \u0111ang \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 tr\u00ean nodejs.org v\u00e0 b\u1ea3n b\u1ea1n d\u00f9ng trong d\u1ef1 \u00e1n.<\/p>\n

3. Fresher c\u1ea7n chu\u1ea9n b\u1ecb g\u00ec?<\/em><\/strong> M\u1ed9t d\u1ef1 \u00e1n API nh\u1ecf c\u00f3 x\u00e1c th\u1ef1c, x\u1eed l\u00fd l\u1ed7i, database v\u00e0 tri\u1ec3n khai ch\u1ea1y \u0111\u01b0\u1ee3c.<\/p>\n

Bu\u1ed5i ph\u1ecfng v\u1ea5n backend \u0111o kh\u1ea3 n\u0103ng gi\u1ea3i th\u00edch \u0111i\u1ec1u g\u00ec x\u1ea3y ra trong runtime khi h\u1ec7 th\u1ed1ng ch\u1ecbu t\u1ea3i. Khi \u00f4n c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Node.js<\/strong>, h\u00e3y \u0111i l\u1ea7n l\u01b0\u1ee3t t\u1eeb event loop, b\u1ea5t \u0111\u1ed3ng b\u1ed9, hi\u1ec7u n\u0103ng \u0111\u1ebfn framework v\u00e0 b\u1ea3o m\u1eadt, m\u1ed7i l\u1edbp g\u1eafn v\u1edbi m\u1ed9t t\u00ecnh hu\u1ed1ng t\u1eebng x\u1eed l\u00fd. Sau \u0111\u00f3, h\u00e3y t\u1ef1 s\u1eeda m\u1ed9t \u0111o\u1ea1n code ngh\u1ebdn event loop v\u00e0 gi\u1ea3i th\u00edch th\u00e0nh ti\u1ebfng tr\u01b0\u1edbc ng\u00e0y ph\u1ecfng v\u1ea5n.<\/p>\n

B\u00e0i vi\u1ebft mang t\u00ednh tham kh\u1ea3o; h\u00ecnh th\u1ee9c ph\u1ecfng v\u1ea5n t\u00f9y t\u1eebng doanh nghi\u1ec7p, th\u00f4ng tin phi\u00ean b\u1ea3n Node.js n\u00ean \u0111\u1ed1i chi\u1ebfu t\u00e0i li\u1ec7u ch\u00ednh th\u1ee9c hi\u1ec7n h\u00e0nh.<\/em><\/p>\n

Minh An<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Nhi\u1ec1u \u1ee9ng vi\u00ean L\u1eadp tr\u00ecnh vi\u00ean Node.js (Node.js Developer) thu\u1ed9c \u0111\u1ecbnh ngh\u0129a nh\u01b0ng l\u00fang t\u00fang khi b\u1ecb h\u1ecfi v\u00ec sao API ch\u1eadm d\u1ea7n. B\u00e0i vi\u1ebft …<\/p>\n","protected":false},"author":58,"featured_media":31501,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45],"tags":[],"class_list":["post-31521","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-phong-van-viec-lam"],"_links":{"self":[{"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/posts\/31521","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/users\/58"}],"replies":[{"embeddable":true,"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/comments?post=31521"}],"version-history":[{"count":1,"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/posts\/31521\/revisions"}],"predecessor-version":[{"id":31522,"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/posts\/31521\/revisions\/31522"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/media\/31501"}],"wp:attachment":[{"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/media?parent=31521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/categories?post=31521"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.careerlink.vn\/cam-nang-viec-lam\/wp-json\/wp\/v2\/tags?post=31521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}