A JSON formatter, validator and viewer that runs on your PC, so your data is never uploaded.
WebRendie
An offline playground for HTML, CSS and JavaScript, with live preview and responsive testing.
Screenshots
Live preview and console 
Project management 
Add CDN libraries 
General settings 
Editor settings 
Offline mock API 
TypeScript task board 
Responsive mobile preview
About this app
Write HTML, CSS and JavaScript, watch the page update as you type, and debug it with a real console. WebRendie opens straight to an editor and a preview, works offline with no account, and keeps everything you make on your PC.
- A live preview beside the editor that updates as you type
- A real console and a JavaScript REPL that runs inside the live page
- Check layouts at phone, tablet and desktop sizes, or your own width and height
- Test fetch() calls offline against a built-in mock API
- Serve a project or folder on localhost from File Explorer, with live reload
- Pro adds React, TypeScript, SCSS and Sass, compiled for you with nothing to install