Language-Specific Formatting in Biome
From the Biome cheat sheet · Formatter · verified Aug 2026
Language-Specific Formatting
Override JavaScript, JSON, and CSS formatting or parser options.
json
{
"javascript": {
"formatter": {
"quoteStyle": "single",
"semicolons": "asNeeded",
"trailingCommas": "all"
}
},
"json": {
"formatter": {
"trailingCommas": "none"
}
}
}💡 Language options override shared formatter settings
📌 Enable Tailwind directives for Tailwind CSS syntax
🔍 JSONC gets comment and trailing-comma parser defaults
⚡ Keep project conventions explicit for predictable diffs
javascriptjsoncsstailwind
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