codesnips

nodejs

javascript 
const crypto = require('crypto');

function computeStrongEtag(body) {
  const buf = Buffer.isBuffer(body) ? body : Buffer.from(String(body));
  const digest = crypto.createHash('sha1').update(buf).digest('base64');
  return '"' + digest + '"';

ETag-Based HTTP Caching in Express With 304 Not Modified Handling

express http-caching etag
by codesnips 3 tabs
javascript 
const express = require('express');
const multer = require('multer');
const os = require('os');
const fs = require('fs/promises');
const { parseCsvStream } = require('./csvStreamParser');

Stream and Validate Large CSV Uploads Row-by-Row with Node Streams and Backpressure

nodejs streams csv
by codesnips 3 tabs
typescript 
import { randomBytes } from 'crypto';
import { Request, Response, NextFunction } from 'express';

interface CspOptions {
  reportOnly?: boolean;
  reportUri?: string;

Content Security Policy headers (defense-in-depth)

security express csp
by codesnips 3 tabs
javascript 
const fs = require('fs');
const readline = require('readline');

async function* streamCsvRows(filePath) {
  const stream = fs.createReadStream(filePath, { encoding: 'utf8' });
  const rl = readline.createInterface({ input: stream, crlfDelay: Infinity });

Stream and Import a Large CSV File Line-by-Line with Node.js readline

nodejs streams readline
by codesnips 3 tabs
javascript 
const pino = require('pino');
const { AsyncLocalStorage } = require('async_hooks');

const als = new AsyncLocalStorage();

const logger = pino({

Request-Scoped Correlation ID Middleware and Child Logger in Express

express middleware logging
by codesnips 3 tabs