How can I fix this?

SkMicky

JSON parse error: Unrecognized token 'draw': was expecting ('true', 'false' or 'null');

David@Quantum

Hey @SkMicky we're going to need a little more info than that to be able to help you. Perhaps you may have passed a string where you should have passed a bool, maybe it's an issue in the database, but there's very little that can be worked out from just the error.
Here's a link to the Debugger which may help you understand better the issue you are experiencing.

Hope this helps,
David

SkMicky

This is my datatable initializing
table = $('#rolesTable').DataTable({
select: true,
processing: true,
serverSide: true,
ajax:{
"url": 'http://aaa.bbb.zz:8083/role/data',
"type": 'POST',
"dataType":'json',
"contentType": "application/json;charset=UTF-8",
"headers": {
'Authorization': localStorage.getItem('token')
}
},
columns: [
{
"ordering": false,
"data": null,
"className": "details-control",
"defaultContent": ''
},
{"data": "id", "className": "id"},
{"data": "name"},
{"data": "description"}
],
});

And this is table in my html

	ID	Name	Description

When I send this request I get the 400 error JSONParseException:Unrecognized token 'draw'. I don't send this token

David@Quantum

@SkMicky - perhaps it it's an issue with the Authorisation token?
If you press F12 to open the inspector, navigate to Application>Storage>Local Storage (with your web-page open) and look for the value associated to the key token, check that.
I'm not familiar with JWT, where is your authorisation token set in your system?

If this is not the token error it could be something that's happening over at the API you're retrieving your data from ... If you haven't already go into the inspector (F12) to Network and refresh the page, click on the row where 'Name' corresponds to your Ajax access URL - see if there's any more insightful information in there.

SkMicky

@David@Quantum it's about "draw" in datatable. Datatable send "draw" to server. This draw sends with numeric value, but that error says that "draw" must be boolean. What's it?

David@Quantum

If you check out the documentation for draw() you'll see that the parameter in draw(_params_) is paging.

To force this to a boolean in your JavaScript try setting paging:

table = $('#rolesTable').DataTable({
    select: true,
    processing: true,
    serverSide: true,
    ajax:{
        "url": 'http://aaa.bbb.zz:8083/role/data',
        "type": 'POST',
        "dataType":'json',
        "contentType": "application/json;charset=UTF-8",
        "headers": {
            'Authorization': localStorage.getItem('token')
        }
    },
    columns: [
    {
        "ordering": false,
        "data": null,
        "className": "details-control",
        "defaultContent": ''
    },
    {"data": "id", "className": "id"},
    {"data": "name"},
    {"data": "description"}
    ],
    "paging": false
});

Note the: "paging: false" I've added at the end.

SkMicky

@David@Quantum No I\m not about draw(), but I'm talking about draw parameter

draw integer Draw counter. This is used by DataTables to ensure that the Ajax
returns from server-side processing requests are drawn in
sequence by DataTables (Ajax requests are asynchronous and
thus can return out of sequence). This is used as part of the draw
return parameter (see below).

This draw parameter is unrecognized with 400 error and message that this must be bool value. I don't configure this draw by myself

kthorngren

The first place to start is by looking at what the server responds with for the server side ajax request. In the browser's developer tools look at the response. You can post it in the thread so we can see it. This technote will provide steps for this.

Kevin

SkMicky

{"timestamp":"2019-10-22T11:44:07.475+0000","status":400,"error":"Bad Request","message":"JSON parse error: Unrecognized token 'draw': was expecting ('true', 'false' or 'null'); nested exception is com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'draw': was expecting ('true', 'false' or 'null')\n at [Source: (PushbackInputStream); line: 1, column: 6]","path":"/role/data"} this is response

kthorngren

Sounds like this error is seen in your server logs?

JSONParseException:Unrecognized token 'draw'

If so then we need to find out more about your server script. Are you using one of the Datatables provided scripts or your own?

Probably need to using some debugging in your server script to see what its receiving and why its unable to process it.

Kevin

SkMicky

Thanks Kevin. This is not Datatables server script, but I'm frontend developer and cann't see or change server script. This enough for me that problem is on the server side not mine. Thanks