Webhook payload invalid JSON fix
Providers send JSON; if your stack parses too early or middleware rewrites the body, signature and JSON both fail. Keep raw bytes for HMAC and JSON parse separately.
Common causes
- Parsing before signature verification.
- UTF-8 BOM or gzip double-decode.
- Truncated body from size limits.
How to fix
- Format raw text in Webhook Payload Viewer.
- Validate with Request Body Validator.
- Increase body size limits where safe.
Use our tool
Webhook Payload ViewerRelated