Free n8n & AI Developer Tools

Browser-based utilities for building and debugging n8n API requests, checking JSON and auth formats, estimating AI API costs, and reviewing seller images locally.

AI API Cost Calculator
Estimate monthly token costs.Seller Product Image Checker
Check image dimensions, format and file size locally.n8n HTTP Request JSON Builder
Build methods, headers, typed JSON bodies and cURL locally.Fix “JSON Parameter Needs to Be Valid JSON” in n8n
Validate JSON locally and fix common HTTP Request body errors.Fix n8n HTTP Request 401 Unauthorized
Check Bearer vs API-key header formatting locally without sending your secret.n8n HTTP Request JSON Examples
POST bodies, headers, nested data and debugging checks.

Tools are provided as-is. Verify current provider or marketplace requirements before relying on results.