JSON Formating List

Hi Niklas15 

the possibilities to change the list form with FormsFormatting you can find here: https://learn.microsoft.com/sharepoint/dev/declarative-customization/list-form-configuration?WT.mc_id=DX-MVP-5004845  You can find any examples here: https://pnp.github.io/List-Formatting/formsamples/

You can use Power Apps for a custom forms design: https://learn.microsoft.com/sharepoint/dev/business-apps/power-apps/get-started/create-your-first-custom-form?WT.mc_id=DX-MVP-5004845 

Regards, Dave

1. Check formatting 
Verify that JSON is valid using the online tool JSONLint 
Ensure that all quotes "" and parentheses {} are closed in pairs 
2. Match field types 
Numeric values should not be in quotes "price": 100 (correct) vs. "price": "100" (incorrect) 
The date must be formatted as "2023-01-01T00:00:00Z" 
3. Re-enter data 
Delete problematic JSON 
Manually enter simple test data 
4. Field name checking 
Confirm internal field names in list settings (display names may be different) 
e.g. "ProductName" may correspond to Title or ProductName 
5. Special Character Handling 
Backslashes in front of quotes in the text: "Remarks": "This is \" important \ "Note" 
Line wrapping with \n:" Content": "first line \n second line" 
6. Test directly with your browser 
Press F12 to open Developer Tools 
Go to Network tab 
View error response when submitting