fprint

Node.js file fingerprinting

Returns hash digest (fingerprint) of a given file or stream in node.js Any hash algorithm that node.js crypto supports can be given.

Install

npm i fprint -S

Usage

fprint(input, algorithm, [next])

Returns algorithm hex hash digest for a given input. Supports both promise and callback interfaces - either pass next<err, digest> as a 3d argument or operate on a returned promise.

input - either Buffer, ReadableStream or file path. Supports both relative and absolute paths

Examples:

const fprint = require('fprint');
const fs = require('fs');
const filepath = '/path/to/file';
const stream = fs.createReadStream(filepath);
const fileContents = fs.readFileSync(filepath);

fprint(file, 'sha256').then(shasum => {
  // operate on sha256 digest
});

fprint(stream, 'sha256').then(shasum => {
  // operate on sha256 digest
});

fprint(filepath, 'sha256').then(shasum => {
  // operate on sha256 digest
})

fprint.sync(buffer, algorithm)

const fs = require('fs');
const fprint = require('fprint');
const file = fs.readFileSync('/path/to/file.min.js');
const md5 = fprint.sync(file, 'md5');

Testing

1. shasum -a 256 ./test/fixtures/files/* | awk '{print $1}' > ./test/fixtures/sums/sha256
2. md5 -q ./test/fixtures/files/* > ./test/fixtures/sums/md5
3. npm test