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6over3/exiftool: ExifTool powered by WebAssembly to extract metadata from files in browsers and Node.js environments using zeroperl

ExifTool (13.30) powered by WebAssembly to extract and write metadata from files in browsers and Node.js environments using zeroperl.

npm install @uswriting/exiftool

This package provides a WebAssembly-based implementation of ExifTool that works in both browser and Node.js environments. It leverages zeroperl to execute ExifTool without requiring any native binaries or system dependencies.

import { parseMetadata } from '@uswriting/exiftool';

// Browser usage with File API
document.querySelector('input[type="file"]').addEventListener('change', async (event) => {
  const file = event.target.files[0];
  const result = await parseMetadata(file);
  
  if (result.success) {
    console.log(result.data);
  } else {
    console.error('Error:', result.error);
  }
});

import { writeMetadata } from '@uswriting/exiftool';

const result = await writeMetadata(file, {
  'Author': 'John Doe',
  'Title': 'My Photo',
  'Keywords': 'nature,photography'
});

if (result.success) {
  // result.data contains the modified file as Uint8Array
  const modifiedBlob = new Blob([result.data]);
}

import { parseMetadata } from '@uswriting/exiftool';

const result = await parseMetadata(file, {
  args: ['-Author', '-CreateDate', '-Make', '-Model']
});

if (result.success) {
  console.log(result.data);
}

import { parseMetadata } from '@uswriting/exiftool';

const result = await parseMetadata(file, {
  args: ['-json', '-n'],
  transform: (data) => JSON.parse(data)
});

if (result.success) {
  // Typed access to properties
  console.log(result.data); // { ... }
}

• In browser environments, pass the File object directly from file inputs. Do not convert it to an ArrayBuffer or Uint8Array.
• This package uses asynchronous web APIs for file processing which allows handling files over 2GB without loading them entirely into memory.
• ExifTool is executed entirely within the browser or Node.js environment - no server requests are made for metadata extraction.

async function parseMetadata<TReturn = string>(
  file: Binaryfile | File,
  options: ExifToolOptions<TReturn> = {}
): Promise<ExifToolOutput<TReturn>>

• file: Either a browser File object or a Binaryfile object with name and data properties.
• options: Configuration options for the metadata extraction.

async function writeMetadata(
  file: Binaryfile | File,
  tags: ExifTags,
  options: ExifToolOptions = {}
): Promise<ExifToolOutput<ArrayBuffer>>

• file: Either a browser File object or a Binaryfile object with name and data properties.
• tags: Object containing metadata tags to write, where keys are tag names and values are tag values.
• options: Configuration options for the write operation.

Returns a Promise that resolves to an ExifToolOutput object:

type ExifToolOutput<TOutput> =
  | {
      success: true;
      data: TOutput;
      error: string;
      exitCode: 0;
    }
  | {
      success: false;
      data: undefined;
      error: string;
      exitCode: number | undefined;
    };

Apache License, Version 2.0

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