Dataverse REST API (Javascript)

Xrm.WebApi (Client API reference) Sample Code

Xrm.WebApi.retrieveMultipleRecords("account", "?$select=name,accountnumber,address1_line1,address1_line2&$filter=name ne null&$orderby=accountnumber asc&$top=10").then(
    function success(results) {
        console.log(results);
        for (var i = 0; i < results.entities.length; i++) {
            var result = results.entities[i];
            // Columns
            var accountid = result["accountid"]; // Guid
            var name = result["name"]; // Text
            var accountnumber = result["accountnumber"]; // Text
            var address1_line1 = result["address1_line1"]; // Text
            var address1_line2 = result["address1_line2"]; // Text
        }
    },
    function(error) {
        console.log(error.message);
    }
);