Retrieve all fields in sharepoint list using jquery or javascript

Question

Hi.
I am trying to retrieve the contents of sharepoint custom list using javascript/jquery. The data should be moved to csv file.
I found an example, which uses below code to move data to csv, but has the fields hardcoded. Is it possible to achieve this with all fields and field names not being hardcoded.

var webUrl = "siteurl";
var listName = "listname";
var fields = ["Id", "FileLeafRef", "Modified"];
var today = new Date();
today.setHours(0,0,0,0);
$.ajax({
    url: webUrl + "/_api/web/lists/GetByTitle('" + listName + "')/items?$filter=Modified ge DateTime'" + today.toISOString() + "'&$select=" + fields.join(","),
    type: "GET",
    headers: {"Accept": "application/json; odata=verbose"}
}).done(function(data) {
    var results = data.d.results;
    var csv = "data:text/csv;charset=utf-8," + fields.join(",") + "\n";
    for (var j = 0; j < results.length; j++) {
        for (var k = 0; k < fields.length; k++) {
            csv += results[j][fields[k]];
            csv += k < fields.length - 1 ? "," : "";
        }
        csv += "\n";
    }
    var a = document.createElement("a");
    a.setAttribute("href", encodeURI(csv));
    a.setAttribute("download", "data.csv");
    document.body.appendChild(a);
    a.click();
});

Answer 1

Try removing the $select parameter to get all the field values. If there's still one or more values missing from the response, trying change the end of the request URL to &$select=*,FieldValuesAsText&$expand=FieldValuesAsText. Sometimes FieldValuesAsText includes field values not returned by default by the REST API.

Something like this, https://robwindsortest991.sharepoint.com/sites/Demo/_api/Web/Lists/GetByTitle('Products')/Items?$select=*,FieldValuesAsText&$expand=FieldValuesAsText

Answer 2

Hi @venkatesh padmanabhan ,
I agree with RobWindsor-4651's answer. We can use FieldValuesAsText to get all fields. If you want to save the fields to array, we can use Object.keys(). You can refer to following code.

			var webUrl = "https://xxx.sharepoint.com/sites/abc";  
			var listName = "TestList";  
			$.ajax({  
				url: webUrl + "/_api/web/lists/GetByTitle('" + listName +  
					"')/items?$select=*,FieldValuesAsText&$expand=FieldValuesAsText",  
				type: "GET",  
				headers: {  
					"Accept": "application/json; odata=nometadata"  
				}  
			}).done(function(data) {  
				var results = data.value;  
				var FieldValues = results[0]["FieldValuesAsText"];  
				var fields = Object.keys(FieldValues);  
				console.log(fields);  
				var csv = "data:text/csv;charset=utf-8," + fields.join(",") + "\n";  
				for (var j = 0; j < results.length; j++) {  

					for (var k = 0; k < fields.length; k++) {  
						csv += results[j][fields[k]];  
						csv += k < fields.length - 1 ? "," : "";  
					}  
					csv += "\n";  
				}  
				var a = document.createElement("a");  
				a.setAttribute("href", encodeURI(csv));  
				a.setAttribute("download", "data.csv");  
				document.body.appendChild(a);  
				a.click();  
			});  

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