getExtensions

Get corresponding file extension array based on MIME type.

API

getExtensions

Return

Argument	Description	Type
Array	File extension array (without dot)	string[]

Parameters

Parameter	Description	Type	Default
mimeType	MIME type	string	Required

Example

Basic Usage

import { getExtensions } from 'ranuts';

const exts = getExtensions('image/jpeg');
console.log(exts); // ['jpeg', 'jpg', 'jpe']

Get All Extensions

import { getExtensions } from 'ranuts';

const jsExts = getExtensions('application/javascript');
console.log(jsExts); // ['js', 'jsx', 'ts', 'tsx']

File Type Validation

import { getExtensions } from 'ranuts';

function isValidImageFile(filename, mimeType) {
  const exts = getExtensions(mimeType);
  const fileExt = filename.split('.').pop();
  return exts.includes(fileExt);
}

console.log(isValidImageFile('photo.jpg', 'image/jpeg')); // true

Notes

1. Return format: Returned extensions don't include dot (.), e.g., 'jpg' instead of '.jpg'.
2. Multiple extensions: One MIME type may correspond to multiple extensions, returns all matching extensions.
3. Empty array: If MIME type doesn't exist, returns empty array.
4. Use case: Commonly used for file type validation, file upload checking, etc.