Parsing HTML and JSON Reliably
Writing selectors that survive redesigns, validating output with a schema, and defensive parsing so one missing field does not corrupt a whole dataset.
36 articles, page 2 of 2
Writing selectors that survive redesigns, validating output with a schema, and defensive parsing so one missing field does not corrupt a whole dataset.
Offset, cursor and infinite-scroll pagination, detecting the end condition, deduplicating across pages, and resuming a crawl after a failure.
When an official API is available and sufficient, use it. How the two compare on reliability, cost, limits and legal footing, plus the hybrid approach.
How to locate the JSON endpoints a page loads from, replay them with sane headers, and get structured data instead of parsing rendered HTML.
Using asyncio with aiohttp or httpx for concurrent scraping, why more concurrency often means less throughput, and how to throttle per host without stalling.
Building scrapers in Java: fetching with the built-in HttpClient, parsing with Jsoup, driving a browser with Selenium, and configuring proxies for each.
Puppeteer scraping in Node: launch arguments, proxy configuration, waiting strategies, memory management across many pages, and when headless is overkill.
Configuring proxies per browser and per context in Playwright, running parallel identities safely, and cutting bandwidth with request interception.
Configuring proxies in Selenium for Chrome and Firefox, handling proxy authentication, and rotating endpoints across driver instances safely.
Setting up Scrapy with a proxy, writing a rotating middleware with health tracking, and tuning throttle and retry settings so the spider backs off cleanly.
Choosing a parser, writing selectors that survive redesigns, handling malformed HTML, and the mistakes that make a BeautifulSoup scraper break silently.
Configuring single and rotating proxies in Python requests, per-request routing, timeouts, retries with backoff, and logging which exit IP served a call.
A working Python scraping guide: fetch static pages with requests, parse them with BeautifulSoup, add a browser when needed, and configure a proxy correctly.
A grounded introduction to web scraping: what it is, how it differs from an API, the basic anatomy of a scraper, and where the legal and ethical lines sit.
Where residential proxies actually earn their cost: price monitoring, SERP and ad checks, market research, travel, real estate and brand protection.
A proxy pool is the set of endpoints a scraper draws from. Here is how to design one with health checks, cooldowns and per-target concurrency control.
Clean, pre-filtered residential and mobile proxies, sign up and send your first request in minutes.