AutomateLab

Zapier errors / Config

Invalid input JSON when configuring custom request

platform: Zapier / category: Config

Cause

Extra whitespace, a trailing comma, or an unescaped character in the JSON body of a Webhooks/HTTP action made the payload invalid before sending.

Fix

Paste the JSON body into a validator (e.g. jsonlint.com) to find the syntax error. Remove leading/trailing whitespace and tabs in the field. Ensure dynamically mapped strings that may contain quotes are properly escaped. Save and re-test.

Source thread →

Part of the Automation Error Index — Zapier errors: browse all.

Hitting an automation error we have not covered?

AutomateLab builds and debugs n8n, Make, and agent workflows as fixed-scope projects. If something is broken in production, tell us what you are seeing.

Describe the problem