---
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"@id": https://www.twilio.com/docs/api/errors/45733#article
headline: "45733: Pre-engagement data is not in valid JSON format."
url: https://www.twilio.com/docs/api/errors/45733
inLanguage: en
dateModified: 2026-05-05T17:40:20.000Z
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publisher:
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  name: Twilio
---

# 45733: Pre-engagement data is not in valid JSON format.

Log Type: APPLICATION

Log Level: ERROR

## Description

Failed to create webchat conversation. Pre-engagement data not in valid JSON format.

### Possible causes

Pre-engagement data is not in valid JSON format.

### Possible solutions

Ensure pre-engagement data is in valid JSON format.

Read more about creating valid attributes [here.](/docs/conversations-classic/attributes)