Internet Archive Metadata Service

A service for retrieving metadata about items in the Internet Archive.

Installation

npm install @internetarchive/metadata-service

Usage

Fetch Metadata

const metadataResponse: MetadataResponse = await metadataService.fetchMetadata('some-identifier');

metadataResponse.metadata.identifier // => 'some-identifier'
metadataResponse.metadata.collection.value // => 'some-collection'
metadataResponse.metadata.collection.values // => ['some-collection', 'another-collection', 'more-collections']

Metadata Values

Internet Archive Metadata is expansive and nearly all metadata fields can be returned as either an array, string, or number.

The Metadata Service handles all of the possible variations in data formats and converts them to their appropriate types. For instance on date fields, like date, it takes the string returned and converts it into a native javascript Date value. Similarly for duration-type fields, like length, it takes the duration, which can be seconds 324.34 or hh:mm:ss.ms and converts them to a number in seconds.

There are parsers for several different field types, like Number, String, Date, and Duration and others can be added for other field types.

See src/models/metadata-fields/field-types.ts

Usage

metadata.collection.value // return just the first item of the `values` array, ie. 'my-collection'
metadata.collection.values // returns all values of the array, ie. ['my-collection', 'other-collection']
metadata.collection.rawValue // return the rawValue. This is useful for inspecting the raw response received.

metadata.date.value  // return the date as a javascript `Date` object

metadata.length.value  // return the length (duration) of the item as a number of seconds, can be in the format "hh:mm:ss" or decimal seconds

Development

Prerequisite

npm install

Testing

npm run test

Demo

npm run start

Linting

npm run format