web scraping 5 open source 4 node.js 4 node 4 parallel computation 3 performant 3 performance 3 performance monitoring 3 performance optimization 3 performance testing 3 pnpm 3 pow 3 process 3 production 3 programming 3 proof 3 proof generation 3 proof generator 3 proof of work 3 proof verification 3 proof verifier 3 proof-of-work 3 quick 3 rate limiting 3 ratelimit 3 recaptcha 3 reliability 3 request 3 javascript 3 javascript tool 3 library 3 lightweight 3 logging 3 logic 3 login security 3 low overhead 3 machine learning 3 malicious traffic 3 minimal 3 mining 3 mitigation technique 3 module 3 modules 3 monitoring 3 minimalist 3 node.js runtime 3 node.js tool 3 nonce 3 non-blocking i/o 3 online security 3 optimization 3 package 3 resilience 3 turing test 3 unwanted traffic 3 user experience 3 validation 3 validation process 3 verification 3 verification process 3 verifier 3 vulnerability 3 web application protection 3 web application security 3 web defense 3 web defense system 3 web development 3 web security 3 web security tool 3 web services 3 web worker 3 web workers 3 website defense 3 website protection 3 website security 3 work validation 3 worker thread 3 workers 3 resource efficient 3 scrapers 3 secure hashing 3 security analytics 3 security challenge 3 security component 3 security library 3 security measure 3 security model 3 security monitoring 3 security protocol 3 security system 3 security technique 3 security testing 3 server defense 3 software development 3 solver 3 spam bots 3 spam filtering 3 spam mitigation 3 spam prevention 3 target difficulty 3