Node.js Bing Image Search Stream

Query Bing Image Search API (v7) and get a readable stream of response objects.

Motivation

Bing Image Search API returns up to 150 results per API call. To access more results, you need to specify the proper offset request parameter in a subsequent API call. This module automates the process of filling the offset parameter value and determines when to stop making API calls— what you get in the end is a readable stream of parsed responses.

Response objects

Please note that response objects wrap search results in the value field.

{
  _type: 'Images',
  totalEstimatedMatches: 834,
  nextOffset: 195,
  value: [
    {
      name: ...,
      thumbnailUrl: ...,
      datePublished: ...,
      contentUrl: ...,
      ...
    },
    ...
  ],
  ...
}

This module doesn't unwrap search results for you because response objects may contain additional metadata (e.g., queryExpansions, pivotSuggestions, similarTerms and relatedSearches).

Installation

npm install --save bing-image-search-stream

Example Usage

Here's an example the calculating the total number of search results.

const BingImageSearchStream = require('bing-image-search-stream');

let responses = [];
new BingImageSearchStream({
  key:'<YOUR_BING_IMAGE_SEARCH_API_SUBSRIPTION_KEY>',
  query: 'kittens',
  amount: 151,
}).on('data', (data) => {
  responses.push(data);
}).on('end', () => {
  const total = responses.reduce((acc, result) => acc + result.value.length, 0);
  console.log('total: ', total);
});

This example takes advantage of Node.js 10's experimental support for asynchronously iterating over readable streams to print out search results to the console.

const BingImageSearchStream = require('bing-image-search-stream');

(async () => {
  const resultsStream = new BingImageSearchStream({
    key:'<YOUR_BING_IMAGE_SEARCH_API_SUBSRIPTION_KEY>',
    query: 'kittens',
    amount: 151,
  })
  for await (const results of resultsStream) {
    for (const result of results.value) {
      console.log(result);
    }
  }
})();

Options

Parameter	Type	Default	Description
key	string		(Required) Bing Image Search API Subscription Key
query	string		(Required) Search query
amount	integer	2000	Desired count of results
market	string		Market Code of request origin (e.g., en-US)
safeSearch	string	Moderate	Filter adult content (Off, Moderate, Strict)
offset	integer	0	Offset of the initial API call
count	integer	150	Count of results per API call (lower this value may result in more API calls)
queryParams	object		Additional query params (e.g., { imageType: "AnimatedGif" })
headerParams	object		Additional header params (e.g., { Pragma: "no-cache" })
fetchCb	function	fetch	Callback to construct a request that returns a response promise

Features

• Turns a search query into a stream of search response objects
• Ends stream when requested amount is reached or whenthere are no more results
• Avoids results overlap by specifying the offset API parameter with previous response's nextOffset value
• Fills in X-MSEdge-ClientID automatically based on previous API responses

License

MIT