isbinaryfile

isBinaryFile

Detects if a file is binary in Node.js using ✨promises✨. Similar to Perl's -B switch, in that:

• it reads the first few thousand bytes of a file
• checks for a null byte; if it's found, it's binary
• flags non-ASCII characters. After a certain number of "weird" characters, the file is flagged as binary

Much of the logic is pretty much ported from ag.

Note: if the file doesn't exist or is a directory, an error is thrown.

Installation

npm install isbinaryfile

Usage

Returns Promise<boolean> (or just boolean for *Sync). true if the file is binary, false otherwise.

isBinaryFile(filepath)

• filepath - a string indicating the path to the file.

isBinaryFile(bytes[, size])

• bytes - a Buffer of the file's contents.
• size - an optional number indicating the file size.

isBinaryFileSync(filepath)

• filepath - a string indicating the path to the file.

isBinaryFileSync(bytes[, size])

• bytes - a Buffer of the file's contents.
• size - an optional number indicating the file size.

Examples

Here's an arbitrary usage:

const isBinaryFile = require("isbinaryfile").isBinaryFile;
const fs = require("fs");

const filename = "fixtures/pdf.pdf";
const data = fs.readFileSync(filename);
const stat = fs.lstatSync(filename);

isBinaryFile(data, stat.size).then((result) => {
  if (result) {
    console.log("It is binary!")
  }
  else {
    console.log("No it is not.")
  }
});

const isBinaryFileSync = require("isbinaryfile").isBinaryFileSync;
const bytes = fs.readFileSync(filename);
const size = fs.lstatSync(filename).size;
console.log(isBinaryFileSync(bytes, size)); // true or false

Testing

Run npm install, then run npm test.

Similar packages

Other packages similar to isbinaryfile

isbinaryfile

The isbinaryfile package is another option for determining if a file is binary or text. It offers similar functionality to the isbinaryfile package, allowing you to check files by path or buffer.

file-type

The file-type package can detect the file type of a buffer or stream. While it is more focused on identifying the file type rather than just determining if it is binary, it can be used to achieve similar results by checking the detected file type.

binaryextensions

The binaryextensions package provides a list of binary file extensions. While it does not directly check if a file is binary, it can be used in conjunction with file extension checks to determine if a file is likely to be binary.