# WhatsApp API Error Invalid Property Value in Flow JSON
Author: Prashant Jangid
Author URL: https://www.heltar.com/blogs/author/prashant-jangid
Published: 2025-04-04
Category: Troubleshoot
Category URL: https://www.heltar.com/blogs/category/troubleshoot
Tags: WhatsApp Flows Error
Tag URLs: WhatsApp Flows Error (https://www.heltar.com/blogs/tag/whatsapp-flows-error)
URL: https://www.heltar.com/blogs/whatsapp-api-error-invalid-property-value-in-flow-json-cm92tqub800059vnvxgr23eeq

If you're working with WhatsApp API flows and encounter the **INVALID\_PROPERTY\_VALUE** error stating:

"At least one terminal screen must have property 'success' set as true."

it means your flow's terminal screens are missing a required configuration. Here’s how to fix it.

## Understanding the Error

In WhatsApp interactive flows, a terminal screen is a final step where the conversation ends. These screens need a 'success' property that indicates whether the interaction ended with a positive business outcome.

If none of your terminal screens have "success": true, the flow will fail with an **INVALID\_PROPERTY\_VALUE** error.

## How to Fix It

1. **Locate Terminal Screens:**


   - Identify all screens in your flow where the conversation terminates.

   - These are marked with "terminal": true in the JSON configuration.


3. **Ensure One Terminal Screen Has 'success' Set to True:**


   - Modify at least one terminal screen to include "success": true.

### Example Fix:

#### Incorrect Configuration (Causing Error)

```
{
  "version": "2.1",
  "screens": [
    {
      "terminal": true,
      "success": false
    }
  ]
}
```

#### Corrected Configuration

```
{
  "version": "2.1",
  "screens": [
    {
      "terminal": true,
      "success": true
    }
  ]
}
```

## Tips to Debug and Prevent Schema Errors​

- Review the official documentation to understand property constraints.
- Use a JSON schema validator to catch errors early.
- Ensure properties are placed in the correct hierarchy.
- If using a coding environment, enable JSON linting.
- Ensure the structure follows API requirements.​

For more troubleshooting insights related to WhatsApp Business API, check out [heltar.com/blogs](http://heltar.com/blogs).


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