Webhook and API step errors

The errors on this page can occur with steps that send or receive data over webhooks. For errors returned by the axiom.ai API itself, see API errors.

Text must be valid JSON

Error: Text must be a valid JSON string. The error can also appear as (Something) is not valid JSON.

Problem: The payload set on a Trigger webhook step isn't valid JSON.

Fix: Check the payload for syntax issues such as missing quotes, trailing commas, or unescaped characters. Paste it into an online JSON validator if you're unsure.

Webhook returned an error

Error: Webhook server returned an error. Please check your JSON for errors.

Problem: axiom.ai sent the payload, but the receiving server responded with an error. The cause is on the receiving end, not in axiom.ai.

Fix: Check what the receiving service expects. Common causes include payload structure mismatches, missing authentication headers, or a service outage on the receiving end.

No data received from webhook

Error: No data has been received from an external service and no test data entered for this step.

Problem: A Receive data from another app step ran without any data flowing in from the trigger, and no test data is set on the step.

Fix: When testing the automation manually, toggle Test data on and set a sample 2D array so the step has something to work with. When triggering from a webhook, check the upstream service is actually sending data in the format axiom.ai expects.