JSONC.sublime-syntax — Sublime Text 4 JSONC/JSON with Comments syntax. Install: Preferences → Browse Packages (or ~/Library/Application Support/Sublime Text/Packages on macOS, ~/.config/sublime-text/Packages on Linux), create Packages/JSONC/, save this file as JSONC.sublime-syntax, restart Sublime, then select JSONC in the bottom-right syntax menu.

JSONC.sublime-syntax.3E6AUF

# JSONC for Sublime Text 4
#
# Install
# 1. Open your Sublime Text Packages directory:
#    - macOS: ~/Library/Application Support/Sublime Text/Packages
#    - Linux: ~/.config/sublime-text/Packages
#    - Windows: %APPDATA%\Sublime Text\Packages
#    Or open the Command Palette (macOS: Cmd+Shift+P, Windows/Linux: Ctrl+Shift+P),
#    run "Preferences: Browse Packages", and use the folder that opens.
# 2. Create a new directory named JSONC inside that Packages directory
#    (not inside the User subdirectory).
# 3. Save this file there as:
#    Packages/JSONC/JSONC.sublime-syntax
# 4. Restart Sublime Text.
# 5. Open a .jsonc file, click the syntax name in the bottom-right corner,
#    and choose "JSONC". Optionally use
#    View → Syntax → Open all with current extension as… → JSONC
#    so .jsonc files open with this syntax automatically.
#
# Notes
# - This syntax reuses Sublime's built-in JSON grammar and adds // and /* */ comments.
# - Syntax highlighting does not stop plugins that run strict JSON validation on save.
#   If a validator popup still appears, disable that package's validate-on-save for .jsonc.

%YAML 1.2
---
name: JSONC
scope: source.json.jsonc
version: 2

file_extensions:
  - jsonc

contexts:
  prototype:
    - include: comments

  main:
    - include: scope:source.json

  comments:
    - match: //
      scope: punctuation.definition.comment.jsonc
      push: line-comment

    - match: /\*
      scope: punctuation.definition.comment.begin.jsonc
      push: block-comment

  line-comment:
    - meta_include_prototype: false
    - meta_scope: comment.line.double-slash.jsonc
    - match: $
      pop: true

  block-comment:
    - meta_include_prototype: false
    - meta_scope: comment.block.jsonc
    - match: \*/
      scope: punctuation.definition.comment.end.jsonc
      pop: true