Scratchpad to format small snippets

Hello !

In my day to day work I often have to write small snippets to illustrate ticket tech strategy.

I was wondering if you guys knew a cool way to have quick scratchpad where I could manipulate the snippet, format it, and have minimal syntax coloration.

This is usually handled by LSP, but sometimes having a full lsp running is not practical, with all the overhead of typescript config for example.

Main formats are JSON, typescript and soon Rust.

Cheers