Fast, Free
Developer Tools
Simple browser-based tools for developers. Format JSON, decode JWT tokens, generate UUIDs and more. Everything runs locally for maximum privacy.
Featured Tools
JSON Formatter
Format, minify, and beautify your JSON data instantly.
JSON Validator
Validate JSON against common errors with clear error locations.
JWT Decoder
Decode JWT headers and payloads locally. Tokens never leave your browser.
Base64 Converter
Encode text, decode Base64 strings, or convert images to Data URLs locally.
UUID Generator
Generate secure, cryptographically random Version 4 UUIDs in bulk instantly.
Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and vice versa.
Regex Tester
Test and validate regular expressions instantly with live match highlighting.
Why DevToolkit?
Private by Default
All processing happens in your browser. We never upload your data to our servers.
Lightning Fast
No API calls means instant results. Perfect for your daily development workflow.
No Account Required
Jump straight in and use our tools for free. No paywalls, no signup forms.
Frequently Asked Questions
Everything you need to know about DevToolkit.
Is my data secure?
Yes. All processing is done locally in your browser. We don't send your JSON, JWTs, or any other data to a server for processing.
Is DevToolkit free to use?
Yes, DevToolkit is completely free and requires no account or subscription.
Will you add more tools?
Absolutely. We are continuously building new developer utilities. Base64 converters, Timestamp tools, and Regex testers are on the roadmap.