How to access search service api to get results in JSON format?

Question

How to access search service api to get results in JSON format in asp.net web application outside SharePoint farm. It should be an app or SharePoint hosted.
I have tried the same with the help of "http://dotnetmafia.com/blogs/dotnettipoftheday/archive/2013/04/09/how-to-query-sharepoint-2013-using-rest-and-javascript.aspx".
function onQuerySuccess(data) {
    var results = data.d.query.PrimaryQueryResult.RelevantResults.Table.Rows.results;
    $("#resultsDiv").append('<table>');
    $.each(results, function () {
        $("#resultsDiv").append('<tr>');
        $.each(this.Cells.results, function () {
            $("#resultsDiv").append('<td>' + this.Value + '</td>');
        $("#resultsDiv").append('</tr>');
    $("#resultsDiv").append('</table>');
But we are getting data.d as undefined.
I have checked and verify that I am getting success and data in XML format not in JSON. As I expected the JSON. Although I have specified the "JSON" in headers " headers:
{ "Accept": "application/json;
odata=verbose" } ". 
Thanks

Answer 1

Hi,
Per my understanding, you might want to access search service REST API and get results in JSON format using jQuery.
The code you use is working in a SharePoint Hosted App project, to compose a working code snippet easier, you can take the demo below for a try:
<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
_spBodyOnLoadFunctionNames.push("ready");
function ready()
var spAppWebUrl = _spPageContextInfo.webAbsoluteUrl;
var queryUrl = spAppWebUrl + "/_api/search/query?querytext='book'";
$.ajax({
url: queryUrl,
method: "GET",
headers: { "Accept": "application/json; odata=verbose" },
success: function (data) {
console.log(data);
var results = data.d.query.PrimaryQueryResult.RelevantResults.Table.Rows.results;
$.each(results, function () {
$.each(this.Cells.results, function () {
console.log(this.Key+"--"+this.Value);
error: function (data) {
console.log(data);
</script>
Add the code into a page of your site, it will retrieve JSON format data and print the search result in the console of browser.
More information about how to work with SharePoint Hosted App:
https://msdn.microsoft.com/en-us/library/office/fp142379.aspx
If you want to call the search service REST API in a remote environment, authentication is required to be taken into consideration, the link below with a working demo
would be helpful:
https://pholpar.wordpress.com/2013/05/11/accessing-office-365-sharepoint-sites-using-rest-from-a-local-html-javascript-host/
Best regards
Patrick Liang
TechNet Community Support