NODEJS-BASICS4 MIN READ
Sort blocking risks in Node.js
Classify Node.js work by whether it blocks request handling, can be safe at startup, or is usually non-blocking I/O.
Sort each operation by its event-loop risk in a Node.js service. Usually safe at startup Risky in request path Usually non-blocking I/O Read and validate a 1 KB .env file before server.listen() Load a small JSON schema once before accepting traffic Call readFileSync inside GET /quote for every request Parse a 60 MB JSON payload synchronously during a request Await a network request to a user profile service Use await readFile() from fs/promises for a small user-upload metadata file
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