"undefined" is not valid JSON error on updating "@syncfusion/ej2-react-pdfviewer"

[AMIT KUMAR JHA]

I updated the @syncfusion/ej2-react-pdfviewer library and dependencies to version 26 alongwith my new syncfusion license key :

  "@syncfusion/ej2-base": "^26.2.10",
   "@syncfusion/ej2-buttons": "^26.2.10",
  "@syncfusion/ej2-dropdowns": "^26.2.13",
   "@syncfusion/ej2-inputs": "^26.2.14",
 "@syncfusion/ej2-lists": "^26.2.14",
@syncfusion/ej2-navigations": "^26.2.12",
@syncfusion/ej2-pdfviewer": "^26.2.14",
@syncfusion/ej2-react-pdfviewer": "^26.2.14",

but on previewing the pdf the error is coming as : 

SyntaxError: "undefined" is not valid JSON

    at JSON.parse (<anonymous>)

    at FormFields.retreiveFormFieldsData (form-fields.js:639:1)

    at FormFields.formFieldCollections (form-fields.js:568:1)

    at PdfViewerBase.saveFormfieldsData (pdfviewer-base.js:3360:1)

    at PdfViewerBase.requestSuccess (pdfviewer-base.js:2978:1)

    at loadRequestHandler.onSuccess (pdfviewer-base.js:2845:1)

    at AjaxHandler.successHandler (ajax-handler.js:195:1)

    at AjaxHandler.stateChange (ajax-handler.js:173:1)

    at httpRequest.onreadystatechange (ajax-handler.js:68:1)

I have reviewed my service-url, it is working fine. he same code was working fine with my previous version (23.1) Please help me to resolve this issue

[Sathiyaseelan Kannigaraj]

Hi Amit Kumar,

Thank you for reaching out to us. We believe this issue may have occurred if both the client and server sides were not updated properly. Please ensure that both sides have been updated correctly. Below, we have provided a sample upgraded to the version you mentioned. Kindly verify if the issue persists in the provided sample.

Client Sample

Web Service Sample

Replication Steps:

1. Run the Web Service Sample.
2. Run the Client Sample.

Regards,
Sathiyaseelan K

[Rahul Dholariya]

Hello  Sathiyaseelan K,

I'm download your samples and run this 

this is server's terminal and it is running now and also 

this is client's terminal it is also working fine But in API 

throwing this error

So can you please solve this

[Rahul Dholariya]

Hello  Sathiyaseelan K,

I'm download your samples and run this 

this is server's terminal and it is running now and also 

this is client's terminal it is also working fine But in API 

throwing this error

So can you please solve this

[Sathiyaseelan Kannigaraj]

Hi Rahul Dholariya,

Thank you for the update. After reviewing your provided code snippet, we found that the issue occurred because the service URL was not properly included in the client sample. Your sample server was running on the service URL "http://localhost:3001". Please update the client-side configuration with the same service URL and check if you encounter any issues.

Code Snippet:

serviceUrl="https://localhost:3001/pdfviewer"

Regards,

Sathiyaseelan K