Picture the last time you needed to decode a JWT. You Googled "jwt decoder," clicked the first result, and pasted in a token — often a live one — into a text box on a server you know nothing about. That moment bugged me for years. So I built DevTools Kit : 30 everyday developer utilities that do all their work inside your browser . Nothing you paste is ever sent anywhere. No sign-up, no ads, no analytics watching you. The one rule: your data never leaves your machine This ...