Format Code

Format source code using the right formatter for the language — Biome for JavaScript, TypeScript, CSS, and JSON; gofmt for Go.

Route

POST /api/format-code

Parameters

Field	Type	Required	Default	Description
language	string	Yes	—	javascript (or js), typescript (or ts), jsx, tsx, json, css, go
code	string	No*	—	Source code to format (single-file mode)
files	object	No*	—	Map of filename → source code (multi-file mode)
fragment	boolean	No	false	Treat input as a code fragment rather than a complete file
config.indent_width	integer	No	—	Indentation width in spaces
config.semicolons	boolean	No	—	Include semicolons (JS/TS)
config.use_tabs	boolean	No	—	Use tabs instead of spaces

*Provide either code (single file) or files (multiple files), not both.

Response

Field	Type	Description
formatted	string	Formatted code (single-file mode)
files	object	Map of filename → formatted code (multi-file mode)
language_detected	string	Language used for formatting
changes_made	boolean	Whether the code was modified

Examples

Single file TypeScript

curl -X POST https://morso.dev/api/format-code \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"language": "typescript", "code": "const x=1;const y=2;function add(a:number,b:number){return a+b}"}'

{
  "formatted": "const x = 1;\nconst y = 2;\nfunction add(a: number, b: number) {\n\treturn a + b;\n}\n",
  "language_detected": "typescript",
  "changes_made": true
}

Multi-file mode

curl -X POST https://morso.dev/api/format-code \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"language": "typescript", "files": {"index.ts": "const x=1", "utils.ts": "export const add=(a:number,b:number)=>a+b"}}'

{
  "files": {
    "index.ts": "const x = 1;\n",
    "utils.ts": "export const add = (a: number, b: number) => a + b;\n"
  },
  "language_detected": "typescript",
  "changes_made": true
}

Custom config

curl -X POST https://morso.dev/api/format-code \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"language": "javascript", "code": "const x = 1", "config": {"use_tabs": true, "semicolons": false}}'

{
  "formatted": "const x = 1\n",
  "language_detected": "javascript",
  "changes_made": true
}