DEV3 Free URL Encoder and Decoder — Source Code (React + Tailwind)

Source code of the DEV3 URL Encoder and Decoder, a URL encoder and decoder with component and full-URL modes plus a query-string editor that rebuilds the link with correct encoding.

Free download: sign in to any DEV3 account and click Download ZIP. Try it live: https://dev3.tech/tools/url-encoder-decoder shows the finished tool running.

What is in the download

• A standalone Vite + React + TypeScript + Tailwind CSS project: src/tool holds the tool, shared pieces sit beside it
• package.json with exact versions plus a lockfile, so npm ci works
• README.md (run, build, embed in Next.js or plain React) and an MIT LICENSE

What the code does

• encodeURIComponent / encodeURI modes and plus-as-space decoding
• Query parser that keeps order and repeated keys
• Editable key/value table with live rebuilt URL
• Friendly error for malformed percent sequences

Tech stack

React 19, TypeScript, Vite, Tailwind CSS 4.

Install and customise

The How to install and How to use tabs list the steps. In short: unzip, npm ci, npm run dev, then copy the tool folder into your own app if you want to embed it.

Good to know

• A browser-only tool: there is no backend or database in the code.