If you have ever used an online tool that asked you to create an account, verified your email, and then tried to upsell you on a paid plan before letting you format some JSON — you know the pain.
I built DevToolKit as a free, no-signup alternative. Every tool runs 100% client-side in your browser. No data leaves your machine. No cookies. No tracking.
Here are 5 tools from DevToolKit that I use almost daily:
1. Regex Tester
Write a regex pattern, type test strings, and see matches highlighted in real time. Supports flags, capture groups, and a cheat sheet for common patterns.
2. JSON Formatter
Paste minified JSON and get a clean, indented view. Detects syntax errors instantly. Also validates structure — unmatched brackets, trailing commas, and more.
3. JWT Decoder
Paste any JWT token and instantly see the header, payload, and signature details. No server calls — decode happens in your browser using base64 parsing.
4. Hash Calculator
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input. Uses the Web Crypto API — no server round-trips.
5. Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text. Handles UTF-8 properly. Useful for debugging API responses, email attachments, and data URLs.
More Tools
DevToolKit has 15+ free tools including a UUID generator, URL encoder, color converter, HTML entity encoder, timestamp converter, cron parser, diff checker, and more. All at:
nordicnode.github.io/devtoolkit
No signup. No tracking. Just tools.
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