VS Code Extensions

JJPWRGEM

by 20jasper

JSON language server with rich error messages

Downloads

Rating

5.0 / 5 (1)

Version

0.0.4

Last updated

Jun 08, 2026

Linters Formatters #json #language server #formatter #LSP #diagnostics #linter

JSON language server with rich error messages

animation of JJPWRGEM's LSP in a 60,000 line file. file changes are made quickly and feedback is shown quickly. code actions fix common issues like missing colons

Diagnostics are calculated 2–3x faster and use 6–10x less RAM than VSCode's LSP

Requirements

Install jjp

mise use -g github:20jasper/jjpwrgem

See releases for shell and PowerShell installation scripts, or npm install -g jjpwrgem

Features

LSP providing

diagnostics
code actions
formatting

Scales well for large files. There is no perceivable delay when editing a 68k line, 5MB file. Diagnostics, code actions, and formatting take less than 20ms