Free Online Developer Tools

What it does

Boost your productivity with free online dev tools! Code formatters, converters, encoders/decoders & more. Fast, easy, and always free. Explore now!

Free online developer tools: JSON formatter, regex tester, Base64, URL encoder, JWT decoder, UUID generator, and timestamp converter. All tools run in your browser.

JSON formatting, regex testing, encoding, decoding, hash generation, timestamp conversion, SEO analysis, and more. Every tool runs entirely in your browser — nothing is uploaded to a server, no account required, no usage limits. 20 essential utilities for developers, content creators, and SEO professionals. Built with Spring Boot and Alpine.js — lightweight, responsive, and privacy-first. Format and validate JSON. Paste messy JSON, get clean indented output. Compress JSON by removing whitespace. Make it as small as possible. Decode JWT tokens. Inspect header and payload without verification. Describe what to match in plain English and get a working regex pattern. Write a regex…from devtoolcore.com

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  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

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