Query Dynamics CRM Through JavaScript

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Using JavaScript, we can send queries to Dynamics CRM to retrieve data. We will go through an example of how to do this.

We will use Xrm.Page.context.getClientUrl() to get the CRM URL. If we run code to get the URL we get:

 var url = Xrm.Page.context.getClientUrl();
 alert("URL: " + url);

We will use this URL to get the full web service URL:

var url = Xrm.Page.context.getClientUrl() + "/XRMServices/2011/OrganizationData.svc/";

Next, we will use the Id of the record in CRM in our query. We will use an example of Leads, so we will get the lead record id:

var Id = Xrm.Page.data.entity.getId();

Now we will construct the query. The query can pass filters, for example if we wanted to see all leads where the lastname is “Cook”, the query would be:

https://yourcrm.crm.dynamics.com/XRMServices/2011/OrganizationData.svc/LeadSet?$filter=LastName eq 'Cook'

To filter the LeadId our query will be:


Now, we will use XMLHttpRequest to post to the web service and get our response back as JSON. We will confirm we have an http status of 200 (OK).

function QueryCRM() {

 var Id = Xrm.Page.data.entity.getId();
 var url = Xrm.Page.context.getClientUrl() + "/XRMServices/2011/OrganizationData.svc/LeadSet(guid'" + Id + "')";

 var req = new XMLHttpRequest();

 req.open("GET", url, false);
 req.setRequestHeader("Accept", "application/json");
 req.setRequestHeader("Content-Type", "application/json; charset=utf-8");

 if (req.readyState == 4 /* complete */) {
 if (req.status == 200) {
 else {
 alert("Error: " + req.responseText);


When we run the page we see:

We can also use JSON.parse to parse the results:


If we want to get the value of a field, we can use:

 var res = JSON.parse(req.responseText).d;
 var LastName = res.LastName;
 alert (LastName);

If there are errors, debug using:



Carl de Souza is a developer and architect focusing on Microsoft Dynamics 365, BI, Web, Cloud and Data Science.

carldesouza.comLinkedIn Twitter | YouTube


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