Welcome

Online Dev Tools is a browser-based developer toolkit built for practical engineering work, fast troubleshooting, and technical exploration. Every utility runs locally in your browser, so you can inspect data quickly without creating an account or uploading files to a third-party server. All tool logic is client-side browser execution.

Teams use these tools during incident response, debugging sessions, API integration checks, and security reviews because they are simple, direct, and consistent. The goal is to reduce friction: open a tool, paste data, get useful output, and move on with your build.

Core tools include JSON Formatter, JSON Editor, JSON to TypeScript converter, JWT Decoder, Regex Tester, URL Parser, Base64 Encoder/Decoder, YAML Validator, UNIX Timestamp Converter, Diff Checker, CIDR/IP Converter, WHOIS Lookup, IP Lookup, CSP Analyzer, Hash Generator, UUID Generator, and Log Explorer.

Online Dev Tools is designed for web developers, full-stack engineers, security engineers, platform teams, and curious builders who want reliable utilities without noise. If you need quick diagnostics, secure local processing, and readable output, this toolbox is built for that exact workflow.

Take a Break

Two lightweight browser games built in-house.

Latest updates

  • JWT Decoder: header/payload decoding + exp/iat/nbf checks + export
  • CSP Analyzer: severity findings + report download (.txt/.json)

What’s coming next

  • In progress: Secure Paste (client-side, self-destructing)
  • Planned: DNS lookup suite + HTTP header checker

Check out the lab that I am (slowly) but surely bringing online. It's a ghost in the machine now but stick around!

BigHomieCed's Labs

Common Use Cases

  • Formatting and validating malformed JSON payloads
  • Inspecting JWT headers, payload claims, and expiration values
  • Reviewing and debugging Content Security Policy headers
  • Generating cryptographic hashes for integrity checks
  • Creating UUIDs for distributed systems and test data
  • Exploring structured logs during debugging or incident response

Security Model

  • No backend data persistence
  • No cross-user data access
  • Stateless request model
  • No account authentication surface
  • Minimal attack surface due to static delivery

Why Local-First?

  • Lower latency — no round-trip to a processing server
  • Reduced risk of sensitive data exposure
  • No backend infrastructure dependency for core functionality
  • Transparent, inspectable browser execution
  • Predictable behavior without hidden processing layers