file-type-mime v0.4.6

file-type-mime

Utility to parse mime type from a file content.

Usage

Browser (react)

import { parse } from 'file-type-mime';

export default function fileUpload() {
  async function onChange(e) {
    const [file] = e.target.files;
    const buffer = await file.arrayBuffer();
    const result = parse(buffer);

    console.log('MIME_TYPE', result);
  }

  return (
    <form>
      <input type="file" onChange={onChange}>
    </form>
  );
}

Node.js

import { parse } from "file-type-mime";
import { readFileSync } from "node:fs";
import { resolve } from "node:path";

const file = resolve("./path/to/file.pdf");
const buffer = readFileSync(file);
const result = parse(buffer);

console.log("MIME_TYPE", result);

API

Signature

function parse(buffer: ArrayBuffer, options: Options = {}): Result | undefined

Arguments

buffer

Type: ArrayBuffer

A buffer representing file data

options (optional)

Type: { extra?: boolean; hint?: { ext?: string; mime?: string } }

• hint - used to short-circuit general flow by filtering signatures list
• extra - used to parse additional file type formats (like json, txt)

Return

Type: { ext: string; mime: string } | undefined

Supported file types

(more to come...)

License