Using google's JavaScript client library with custom search api.

client.js

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gapi.load("client",{callback:window["gapi_onload"],_c:{"jsl":{"ci":{"llang":"en","client":{"headers":{"response":["Cache-Control","Content-Disposition","Content-Encoding","Content-Language","Content-Length","Content-MD5","Content-Range","Content-Type","Date","ETag","Expires","Last-Modified","Location","Pragma","Range","Server","Transfer-Encoding","WWW-Authenticate","Vary","X-Goog-Safety-Content-Type","X-Goog-Safety-Encoding","X-Goog-Upload-Chunk-Granularity","X-Goog-Upload-Control-URL","X-Goog-Upload-Size-Received","X-Goog-Upload-Status","X-Goog-Upload-URL","X-Goog-Diff-Download-Range","X-Goog-Hash","X-Goog-Updated-Authorization","X-Server-Object-Version","X-Guploader-Customer","X-Guploader-Upload-Result","X-Guploader-Uploadid"],"request":["Accept","Accept-Language","Authorization","Cache-Control","Content-Disposition","Content-Encoding","Content-Language","Content-Length","Content-MD5","Content-Range","Content-Type","Date","GData-Version","Host","If-Match","If-Modified-Since","If-None-Match","If-Unmodified-Since","Origin","OriginToken","Pragma","Range","Slug","Transfer-Encoding","X-ClientDetails","X-GData-Client","X-GData-Key","X-Goog-AuthUser","X-Goog-PageId","X-Goog-Encode-Response-If-Executable","X-Goog-Correlation-Id","X-Goog-Request-Info","X-Goog-Experiments","x-goog-iam-role","x-goog-iam-authorization-token","X-Goog-Spatula","X-Goog-Upload-Command","X-Goog-Upload-Content-Disposition","X-Goog-Upload-Content-Length","X-Goog-Upload-Content-Type","X-Goog-Upload-File-Name","X-Goog-Upload-Offset","X-Goog-Upload-Protocol","X-Goog-Visitor-Id","X-HTTP-Method-Override","X-JavaScript-User-Agent","X-Pan-Versionid","X-Origin","X-Referer","X-Upload-Content-Length","X-Upload-Content-Type","X-Use-HTTP-Status-Code-Override","X-YouTube-VVT","X-YouTube-Page-CL","X-YouTube-Page-Timestamp"]},"rms":"migrated","cors":false},"plus_layer":{"isEnabled":false},"enableMultilogin":true,"drive_share":{"useStandaloneSharingService":true},"disableRealtimeCallback":false,"isLoggedIn":true,"iframes":{"additnow":{"methods":["launchurl"],"url":"https://apis.google.com/additnow/additnow.html?usegapi\u003d1"},"person":{"url":":socialhost:/:session_prefix:_/widget/render/person?usegapi\u003d1"},"visibility":{"params":{"url":""},"url":":socialhost:/:session_prefix:_/widget/render/visibility?usegapi\u003d1"},"photocomments":{"url":":socialhost:/:session_prefix:_/widget/render/photocomments?usegapi\u003d1"},"plus_followers":{"params":{"url":""},"url":":socialhost:/_/im/_/widget/render/plus/followers?usegapi\u003d1"},"playreview":{"url":"https://play.google.com/store/ereview?usegapi\u003d1"},"signin":{"methods":["onauth"],"params":{"url":""},"url":":socialhost:/:session_prefix:_/widget/render/signin?usegapi\u003d1"},"share":{"url":":socialhost:/:session_prefix::im_prefix:_/widget/render/share?usegapi\u003d1"},"commentcount":{"url":":socialhost:/:session_prefix:_/widget/render/commentcount?usegapi\u003d1"},"page":{"url":":socialhost:/:session_prefix:_/widget/render/page?usegapi\u003d1"},"hangout":{"url":"https://talkgadget.google.com/:session_prefix:talkgadget/_/widget"},"plus_circle":{"params":{"url":""},"url":":socialhost:/:session_prefix::se:_/widget/plus/circle?usegapi\u003d1"},"youtube":{"methods":["scroll","openwindow"],"params":{"location":["search","hash"]},"url":":socialhost:/:session_prefix:_/widget/render/youtube?usegapi\u003d1"},"zoomableimage":{"url":"https://ssl.gstatic.com/microscope/embed/"},"card":{"url":":socialhost:/:session_prefix:_/hovercard/card"},"evwidget":{"params":{"url":""},"url":":socialhost:/:session_prefix:_/events/widget?usegapi\u003d1"},"reportabuse":{"params":{"url":""},"url":":socialhost:/:session_prefix:_/widget/render/reportabuse?usegapi\u003d1"},"follow":{"url":":socialhost:/:session_prefix:_/widget/render/follow?usegapi\u003d1"},"shortlists":{"url":""},"plus":{"url":":socialhost:/:session_prefix:_/widget/render/badge?usegapi\u003d1"},"configurator":{"url":":socialhost:/:session_prefix:_/plusbuttonconfigurator?usegapi\u003d1"},":socialhost:":"https://apis.google.com","post":{"params":{"url":""},"url":":socialhost:/:session_prefix::im_prefix:_/widget/render/post?usegapi\u003d1"},"community":{"url":":ctx_socialhost:/:session_prefix::im_prefix:_/widget/render/community?usegapi\u003d1"},":gplus_url:":"https://plus.google.com","rbr_s":{"params":{"url":""},"url":":socialhost:/:session_prefix::se:_/widget/render/recobarsimplescroller"},"autocomplete":{"params":{"url":""},"url":":socialhost:/:session_prefix:_/widget/render/autocomplete"},"plus_share":{"params":{"url":""},"url":":socialhost:/:session_prefix::se:_/+1/sharebutton?plusShare\u003dtrue\u0026usegapi\u003d1"},":source:":"3p","blogger":{"methods":["scroll","openwindow"],"params":{"location":["search","hash"]},"url":":socialhost:/:session_prefix:_/widget/render/blogger?usegapi\u003d1"},"savetowallet":{"url":"https://clients5.google.com/s2w/o/savetowallet"},"rbr_i":{"params":{"url":""},"url":":socialhost:/:session_prefix::se:_/widget/render/recobarinvitation"},"appcirclepicker":{"url":":socialhost:/:session_prefix:_/widget/render/appcirclepicker"},"udc_webconsentflow":{"params":{"url":""},"url":"https://www.google.com/settings/webconsent?usegapi\u003d1"},"savetodrive":{"methods":["save"],"url":"https://drive.google.com/savetodrivebutton?usegapi\u003d1"},":im_socialhost:":"https://plus.googleapis.com","ytshare":{"params":{"url":""},"url":":socialhost:/:session_prefix:_/widget/render/ytshare?usegapi\u003d1"},":signuphost:":"https://plus.google.com","plusone":{"params":{"count":"","size":"","url":""},"url":":socialhost:/:session_prefix::se:_/+1/fastbutton?usegapi\u003d1"},"comments":{"methods":["scroll","openwindow"],"params":{"location":["search","hash"]},"url":":socialhost:/:session_prefix:_/widget/render/comments?usegapi\u003d1"},"ytsubscribe":{"url":"https://www.youtube.com/subscribe_embed?usegapi\u003d1"}},"isPlusUser":true,"debug":{"host":"https://apis.google.com","forceIm":false,"reportExceptionRate":0.05,"rethrowException":false},"deviceType":"desktop","inline":{"css":1},"lexps":[81,99,97,127,79,123,122,61,30,45],"include_granted_scopes":true,"oauth-flow":{"usegapi":false,"disableOpt":true,"authUrl":"https://accounts.google.com/o/oauth2/auth","proxyUrl":"https://accounts.google.com/o/oauth2/postmessageRelay","idpIframeUrl":"https://accounts.google.com/o/oauth2/iframe"},"report":{"apiRate":{"gapi\\.signin\\..*":0.05},"host":"https://apis.google.com","rate":0.001,"apis":["iframes\\..*","gadgets\\..*","gapi\\.appcirclepicker\\..*","gapi\\.auth\\..*","gapi\\.client\\..*"]},"csi":{"rate":0.01},"googleapis.config":{"auth":{"useFirstPartyAuthV2":true}}},"h":"m;/_/scs/apps-static/_/js/k\u003doz.gapi.en.x9bqwrSGRPE.O/m\u003d__features__/am\u003dIQ/rt\u003dj/d\u003d1/t\u003dzcms/rs\u003dAGLTcCN0eI6mxx5gloA-3kPdKdJqm4_9Lw","u":"https://apis.google.com/js/client.js","hee":true,"fp":"7d667e386190286979d3ea4ae0387037e2854d56","dpo":false},"fp":"7d667e386190286979d3ea4ae0387037e2854d56","annotation":["interactivepost","recobar","autocomplete","profile","signin2"],"bimodal":["signin","share"]}});

customSearch.js

// Loads google's client library
require("./client");


function init(query){
    gapi.client.setApiKey('HERE_PUTS_API_KEY');
    gapi.client.load('customsearch', 'v1', function(){
        makeRequest(query);
    });
}

function makeRequest(query) {
    var request = gapi.client.search.cse.list({
        'cx': "HERE_PUTS_CX",
        'q': query
    });
    request.then(function(response){
        // Do some work for response
        // ...

    }, function(reason) {
        console.log('Error:' + reason.result.error.message);
    });
} 

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