OpenGraph ( Node Client 1.1.3 )

OpenGraph.io client library for nodejs. Given a URL, the client will make a HTTP request to OpenGraph.io which will scrape the site for OpenGraph tags. If tags exist the tags will be returned to you.

Often times the appropriate tags will not exist and this is where OpenGraph.io shines. It will infer what the OpenGraph tags probably would be an return them to you as hybridGraph.

The hybridGraph results will always default to any OpenGraph tags that were found on the page. If only some tags were found, or none were, the missing tags will be inferred from the content on the page.

For most uses, the OpenGraph.io API is free. To get a free forever key, signup at OpenGraph.io.

If you end up having very heavy useage, the vast majority of projects will be totally covered using one of our inexpensive plans. Dedicated plans are also available upon request.

NOTE Our free plan previously required no appId but was unfortunately abused. The free plan still exists and is free forever, you will just have to create an account on OpenGraph.io

Installation

To install the OpenGraph.io client...

Install the NPM package
```
 npm install opengraph-io --save
```

Usage

The client can be used with callbacks or promises. Either way, to initialize the client, add the following line to top of your code:

var opengraph = require('opengraph-io')({appId: 'xxxxxx'});

// OR - supply options

var opengraph = require('opengraph-io')({
    appId: 'xxxxxx', 
    cacheOk: true, // If a cached result is available, use it for quickness
    useProxy: false,  // Proxies help avoid being blocked and can bypass capchas
    maxCacheAge: 432000000, // The maximum cache age to accept
    acceptLang: 'en-US,en;q=0.9', // Language to present to the site. 
    fullRender: false // This will cause JS to execute when rendering to deal with JS dependant sites
});

The options shown above are the default options. To undersand more about these parameters, please view our documentation at: https://www.opengraph.io/documentation/

The options supplied to the constructor above will be applied to any requests made by the library but can be overriden by supplying parameters at the time of calling getSiteInfo.

Using Callbacks

To get site information using callbacks, the following will work

opengraph.getSiteInfo('http://news.com' , function(err, result){
   console.log('Site title is', result.hybridGraph.title);
});

// OR, with custom options for the request

opengraph.getSiteInfo('http://news.com', {cacheOk: false}, function(err, result){
   console.log('Site title is', result.hybridGraph.title);
});

Using Promises

If you are using promises, the same call will behave very similarly

opengraph.getSiteInfo('http://news.com')
   .then(function(result){
     console.log('Site title is', result.hybridGraph.title);
   });

// OR, with custom options for the request

opengraph.getSiteInfo('http://news.com', {cacheOk: false})
   .then(function(result){
     console.log('Site title is', result.hybridGraph.title);
   });

Using Retry Strategies

Using Retry Strategies, you to define a set of parameters you want from Opengraph at the given URL. When the request starts it will use the list of strategies fulfill the requires parameter list. If you provide requires as an parameter of option it's used to define what values you want back to consider it a "good" response.

Below is the example where we want data from Newegg. Using retry strategies we can get the best results.

All requests made are returned using an element of result named allRequests.

opengraph.getSiteInfo('https://www.newegg.com/Product/Product.aspx?Item=N82E16813157762', {
      cacheOk: false,
      retryStrategies: [
        {
          // Requests using the default options.
          requires: ["openGraph.title"]
        },
        {
          // Make a full request to full render
          fullRender: true,
          requires: ["openGraph.title"]
        },
        {
          // Make a request using the proxy
          useProxy: true,
          requires: ["openGraph.title"]
        }
      ]
    })
    .then(function(result){
      console.log('Site title is', result.hybridGraph.title);
    });

Support

Feel free to reach out at any time with questions or suggestions by adding to the issues for this repo or if you'd prefer, head over to https://www.opengraph.io/support/ and drop us a line!

License

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

nhalstead / opengraph-io