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Developer tools · #puppeteer
Use Puppeteer browser contexts to isolate multiple user sessions. Compare default vs. new contexts, trade‑offs, and a step‑by‑step script that sets and verifies cookies and localStorage in separate contexts.
Learn how to use Puppeteer's Request Interception to block unnecessary assets, reduce bandwidth costs, and speed up headless browser execution.
Flaky end-to-end tests often depend on live APIs. Puppeteer's page.route() lets you intercept requests and fulfill them with fixed payloads, but broad interception can hide real failures and add latency.
Puppeteer PDFs lose backgrounds, headers and late-loading content unless you configure the print engine. Here is a working page.pdf() setup and how to verify it.
Learn how to use Puppeteer’s Page.emulate to render a page exactly as it would appear on a mobile device, then take a screenshot. The guide covers prerequisites, a sample script, validation checks, and recovery options for CI environments.
Learn how to mock a specific API call in Puppeteer using request interception to achieve deterministic UI tests without changing the backend.
Puppeteer's request interception can block images, fonts, and trackers to cut bandwidth and runtime in scraping and CI — if you resolve every request and measure the actual savings.
Pick the right Karma browser launcher for CI: a comparison of ChromeHeadless, FirefoxHeadless, and Puppeteer, with a switchable karma.conf.js and validation steps.
Puppeteer request interception lets you block images, stylesheets, and fonts before they download. This blog shows a practical pattern for selective loading, with a script and verification steps for fidelity vs speed.
nodejs
karma