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Cedleft a comment
I built Online Dev Tools as a practical toolkit for engineering work that happens every day but never has a good place to live. Things like inspecting JSON payloads, decoding JWTs, checking CSP policies, generating hashes, parsing URLs, or validating YAML usually mean opening random sites or writing throwaway scripts. This project pulls those workflows into one place. Everything runs locally in...
Online Dev ToolsFast browser-based tools for devs and security engineers
ErrorLookup helps developers quickly understand HTTP status codes while debugging APIs, servers, and web infrastructure.
Instead of just definitions, ErrorLookup shows:
• what each HTTP status code actually means
• common production causes
• related codes that developers often confuse
• practical fixes for redirects, client errors, and server failures
Built to be fast to scan during real debugging sessions, whether you're working on APIs, reverse proxies, load balancers, or web applications.
HTTP Error Lookup CodesUnderstand HTTP errors instantly; causes, comparisons, fixes
Online Dev Tools is a browser-based toolkit for developers and security engineers.
All tools run locally in your browser so you can inspect, transform, and debug data without uploading files or sending sensitive information to external servers.
Includes utilities for JSON formatting, JWT decoding, regex testing, base64 encoding/decoding, hashing, URL parsing, CSP analysis, YAML validation, and more.
Open a tool, paste your data, get useful output, and continue building.
Online Dev ToolsFast browser-based tools for devs and security engineers
Cedleft a comment
Hey everyone — maker here 👋 I built ErrorLookup because I was tired of digging through vague documentation every time an HTTP error popped up while debugging. Most sites just define the code. They don’t explain what actually causes it in production or how it relates to similar errors. ErrorLookup focuses on the practical side: • common causes behind each status code • related codes developers...
HTTP Error Lookup CodesUnderstand HTTP errors instantly; causes, comparisons, fixes