A collection of developer utilities in a single desktop application

Web app that can hash/hmac, encrypt/decrypt, and sign/verify the data, debug JWT tokens, parse and edit ASN1 structures, compute diffs, and more

85 free browser-based developer tools — AES, SHA, JWT, Base64, JSON, Regex, Diff, QR and more. 100% client-side. No login. No tracking.

Plain toolbelt for developers

A simple JWT decoder extension for VS Code

Web application to track and analyze workout data.

Free, open-source developer utilities that run entirely in your browser. 700+ tools across 34 categories.

Privacy-first URL analyzer. Parse, decode & inspect URLs in the browser — JWT, timestamps, Base64, JSON. No data sent to servers.

9-in-1 browser-based developer toolkit. Single HTML file. No dependencies.

Developer-focused cookie manager for security learning and backend testing.

JSON Web Tokens decoder

50 free browser-based developer tools. JSON formatter, regex tester, JWT decoder, UUID generator, QR code generator and more. No login, no ads.

Pocket toolkit for developers

El Sistema Ideal para tu escuela Ideal

BLACKSURFACE is an offensive security reconnaissance and attack-surface mapping platform designed for bug bounty hunters, red teamers, and Penetration Testers. It centralizes reconnaissance workflows, tools, and intelligence into a single, high-impact command interface.

A self-hosted, privacy-first developer toolkit. JSON formatter, diff checker, Base64 codec, code beautifier, regex tester, URL codec, JWT decoder, and color converter — all running 100% client-side. No tracking, no cookies, no server calls, no logging

The offline developer's data workbench — 45 native tools (JSON, regex, JWT, codegen, hashes, crypto, time, network) in one app. Zero network, zero telemetry.

Chrome DevTools extension for inspecting and decoding JWTs in real time

Free privacy-first developer tools that run entirely in your browser — JSON formatter, JWT decoder, regex tester, cron generator, diff checker & smart checklist. No login, no uploads.

JWT-Sem is an educational repository for exploring JSON Web Tokens (JWT) and software security concepts. It includes practical examples and challenges, covering JWT encoding, decoding, signature verification, and simplified RSA operations. The repository also features a web tool with JWT and RSA functionalities to help illustrate these concepts.