Dev Toolkit — by freetoolspot

About

A focused set of text utilities for developers, all running entirely in your browser.

Includes:
• JSON Formatter — prettify, minify, and validate JSON. Pick 2-space, 4-space, or tab indentation. Live error
messages.
• Base64 Encode / Decode — UTF-8 safe, two-way text ↔ Base64.
• URL Encode / Decode — percent-encode strings for query parameters and URL components.
• JWT Decoder — decode the header and payload of a JSON Web Token. Signature is shown but not verified 
(verification requires the secret key).
• Regex Tester — live JavaScript regex matching with highlighted matches and configurable flags.

Privacy: 100% client-side. No data is collected, transmitted, or logged. The extension requests zero
permissions and works fully offline.

Part of the freetoolspot.com toolkit — visit the site for 30+ more browser-based utilities (CSV viewer, color
tools, hash, password generator, and more).