bandcamp-fetch

bandcamp-fetch

A JS library for scraping Bandcamp content; inspired by bandcamp-scraper.

Installation

npm i bandcamp-fetch --save

Usage

const bcfetch = require('bandcamp-fetch');

bcfetch.discover(...).then( results => {
    ...
});

API

Each function returns a Promise which resolves to the fetched data.

discover([params], [options])

Example (output)

Fetches albums through Bandcamp Discover.

• params (optional) - object specifying params to be passed to Bandcamp Discover

  • genre
  • subgenre: only valid when genre is something other than 'all'
  • location
  • sortBy
  • artistRecommendationType: only valid when sortBy is 'rec' (artist recommended)
  • format
  • time
  • page

  All properties are optional. Possible values for each property can be obtained with the getDiscoverOptions() function.

  params passed to this function will be sanitized with sanitizeDiscoverParams(). A copy of the sanitized params can obtained through the params property of the returned result.

• options (optional) - object specifying options to be used when formulating results:

  • albumImageFormat: name, Id or object referring to an image format.
  • artistImageFormat

  All properties are optional. Image formats can be obtained with the getImageFormats() function.

getDiscoverOptions()

Example (output)

Fetches Bandcamp Discover options that can be passed back to discover().

sanitizeDiscoverParams(params)

Example (output)

Sanitizes params by setting default values for omitted params and removing irrelevant ones.

You don't have to call this function on params passed to discover() - they will be sanitized automatically.

getImageFormats([filter])

Example (output)

Fetches the list of image formats used in Bandcamp.

• filter (optional) - 'artist' or 'album'. If specified, narrows down the result to include only formats applicable to the specified value.

getImageFormat(idOrName)

Fetches the image format that matches Id or name. If none is found, the result will be null.

getArtistOrLabelInfo(artistOrLabelUrl, [options])

Example (output)

Fetches information about an artist or label.

• artistOrLabelUrl
• options (optional)
  • imageFormat
  • labelId

This function tries to fetch the most complete set of data by scraping the following pages (returning immediately at any point the data becomes complete):

1. The page referred to by artistOrLabelUrl
2. The 'music' page of the artist or label (artistOrLabelUrl/music)
3. The first album or track in the artist's or label's discography

Sometimes, the label could not be fetched successfully for artists. If you know the labelId of the label that the artist belongs to, you can specify it in options. This will ensure that label will not be null in the artist info. If you pass a label URL to this function, you can find the labelId in the result.

getLabelArtists(labelUrl, [options])

Example (output)

Fetches the list of artists belonging to a label.

• labelUrl
• options (optional)
  • imageFormat

getDiscography(artistOrLabelUrl, [options])

Example (output)

Fetches the list of albums and standalone tracks belonging to an artist or label.

• artistOrLabelUrl
• options (optional)
  • imageFormat

getAlbumInfo(albumUrl, [options])

Example (output)

Fetches information about an album.

• albumUrl
• options (optional)
  • albumImageFormat
  • artistImageFormat
  • includeRawData

Following Bandcamp's removal of description and image URL from artist metadata, artist.description and artist.imageUrl of the returned object are now set to to the same values as publisher.description and publisher.imageUrl, respectively. This is for backward comaptibility and the artist.description and artist.imageUrl properties might be removed in a future release.

Furthermore, if the artist URL is not found in the scraped data, then artist.url will be set to the same value as publisher.url. This behavior might be subject to change in the future.

getTrackInfo(trackUrl, [options])

Example (output)

Fetches information about a track.

• trackUrl
• options (optional)
  • albumImageFormat
  • artistImageFormat
  • includeRawData

Following Bandcamp's removal of description and image URL from artist metadata, artist.description and artist.imageUrl of the returned object are now set to to the same values as publisher.description and publisher.imageUrl, respectively. This is for backward comaptibility and the artist.description and artist.imageUrl properties might be removed in a future release.

Furthermore, if the artist URL is not found in the scraped data, then artist.url will be set to the same value as publisher.url. This behavior might be subject to change in the future.

getAlbumHighlightsByTag(tagUrl, [options])

Example (output)

Fetches album highlights for the tag referred to by tagUrl. The result is an array of album collections, with each collection corresponding to a highlight category such as 'new and notable' and 'all-time best selling'.

• tagUrl

  Tag URLs can be obtained with the getTags() function.

• options (optional)

  • imageFormat

getTags()

Example (output)

Fetches Bandcamp tags. The result is an object with the following properties:

• tags: non-location tags
• locations: location tags

search(params, [options])

Example (output)

Searches for params.query.

• params
  • query: search string
  • page (1 if omitted)
• options (optional)
  • albumImageFormat
  • artistImageFormat

getAllShows([options])

Example (output)

Fetches all Bandcamp shows. Each entry in the returned array contains basic information about a show. To retrieve details of a show, pass the url property of the entry to getShow().

• options (optional)
  • showImageFormat

getShow(showUrl, [options])

Example (output)

Get show details for the given showUrl.

• options (optional)
  • albumImageFormat
  • artistImageFormat
  • showImageFormat

getArticleCategories()

Example (output)

Fetches the list of Bandcamp Daily article categories. Categories are grouped into sections.

getArticleList([params], [options])

Example (output)

Fetches the list of Bandcamp Daily articles under the category specified by params.categoryUrl (or all categories if not specified).

• params (optional)
  • categoryUrl
• options (optional)
  • imageFormat

getArticle(articleUrl, [options])

Example (output)

Fetches the contents of the Bandcamp Daily article at articleUrl.

• articleUrl
• options (optional)
  • albumImageFormat
  • artistImageFormat
  • includeRawData

getTagInfo(tagUrl)

Example (output)

Fetches information about the tag referred to by tagUrl.

getReleasesByTag(tagUrl, [params], [options])

Example (output)

Fetches releases matching the tag referred to by tagUrl.

• tagUrl

• params (optional)

  • filters:
    • location
    • tags: array of tag values to match, in addition to the one referred to by tagUrl.
    • sort
    • format
  • page (1 if omitted)

  All properties are optional. For omitted properties, default values obtained from tagUrl will be used. Possible filter values can be obtained by calling getReleasesByTagFilterOptions(). For filters.location and filters.tag, you may look up additional values not returned by getReleasesByTagFilterOptions() through searchLocation() and searchTag(), respectively.

• options (optional)

  • imageFormat
  • useHardcodedDefaultFilters: if true, use hardcoded default values for filters not specified in params.filters. If false or unspecified, default filter values will be obtained by calling getReleasesByTagFilterOptions() (extra query means slower performance).

getReleasesByTagFilterOptions(tagUrl)

Example (output)

Fetches the list of possible filter values for getReleasesByTag(). For location and tag filters, this function does not return a conclusive list of values. You may use searchLocation() and searchTag() to look up additional values.

• tagUrl: the URL of the tag for which filter values should be returned

searchLocation(params)

Example (output)

Fetches the list of locations matching params.q. Results include both partial and full matches. Each item in the returned array corresponds to a matching location, and its value property can be used for setting the location filter in getReleasesByTag().

• params:
  • q: the string to match
  • limit: the maximum number of results to return

searchTag(params)

Example (output)

Fetches the list of tags matching params.q. Results include both partial and full matches. Each item in the returned array corresponds to a matching tag, and its value property can be used for setting the tags filter in getReleasesByTag().

• params:
  • q: the string to match
  • limit: the maximum number of results to return

Rate Limiting

The API functions can be called with rate limiting like this:

bcfetch.limiter.getAlbumInfo(...);

Example (output)

Rate limiting is useful when you need to make a large number of queries and don't want to run the risk of getting rejected by the server for making too many requests within a short time interval. If you get a '429 Too Many Requests' error, then you should consider using the rate limiter.

The library uses Bottleneck for rate limiting. You can configure the rate limiter like this:

bcfetch.limiter.updateSettings({
    maxConcurrent: 10,  // default: 5
    minTime: 100        // default: 200
});

updateSettings() is just a passthrough function to Bottleneck. Check the Bottleneck doc for the list of options you can set.

Caching

The library maintains an in-memory cache for two types of resources:

1. page - pages fetched during scraping
2. constant - image formats and discover options

Functions related to the cache can be called this way:

const bcfetch = require('bandcamp-fetch');

bcfetch.cache.setTTL('page', 500);
bcfetch.cache.setMaxPages(20);
bcfetch.cache.clear('constant');

cache.setTTL(type, TTL)

Sets the expiry time, in seconds, of cache entries for the given resource type.

• type: 'page' or 'constant'
• TTL: expiry time in seconds (default: 300 for 'page' and 3600 for 'constant')

cache.setMaxPages(maxPages)

Sets the maximum number of pages that can be stored in the cache. A negative value means unlimited. Default: 10.

cache.clear([type])

Clears the cache entries for the given resource type.

• type (optional): 'page' or 'constant'. If unspecified, clears the entire cache.

Changelog

0.2.1-b.20211020b

• Fix URL sometimes null in result of getArtistOrLabelInfo()

0.2.1-b.20211020

• Improve data fetching in getArtistOrLabelInfo()

0.2.0-b.20211020

• Adapt to Bandcamp changes since last version
• Add publisher and label to data fetched by getAlbumInfo() and getTrackInfo()
• Add labelId to data fetched by getArtistOrLabelInfo(labelUrl)
• Add labelId option to getArtistOrLabelInfo() for artist URLs

...(no changelog for earlier versions due to laziness)

License

MIT