Solve image CAPTCHAs via webhook using CaptchaSonic

Description

Quick overview
This workflow exposes a POST webhook that accepts base64 CAPTCHA images and uses the CaptchaSonic community node to solve multiple CAPTCHA types (OCR, reCAPTCHA v2, AWS WAF, TikTok, Binance, and more), returning a standardized JSON response.

How it works
Receives a POST request on the captchasonic-solve webhook containing a JSON body with a type and required fields like image (base64) and sometimes question.
Validates the request payload, checks required fields for the requested CAPTCHA type, and routes the request to the matching solver.
Sends the image challenge to CaptchaSonic using the appropriate recognition operation for the selected type.
Normalizes the CaptchaSonic result into a consistent JSON structure with success, type, solution, and a solvedAt timestamp.
Returns the formatted solution to the original webhook caller, or responds with HTTP 400 and an error message if validation fails.

Setup
Self-host n8n and install the n8n-nodes-captchasonic community node.
Create and select a CaptchaSonic API credential (API key from https://my.captchasonic.com) for the CaptchaSonic nodes.
Activate the workflow, copy the production webhook URL for captchasonic-solve, and configure your client to POST JSON with type plus the required fields (including a base64 image and optional question depending on type).

Requirements
• Self-hosted n8n (community nodes are not available on n8n Cloud)
• CaptchaSonic API key from https://my.captchasonic.com

Customization
• Add new CaptchaSonic solver branches to the Switch node for additional CAPTCHA types
• Modify the Format CAPTCHA Solution code node to change the JSON response structure
• Adjust validation rules in the Validate CAPTCHA Request code node to add or remove required fields

Additional info
Supported CAPTCHA types: imagetotext, recaptchav2, popularcaptcha, awswaf, blsocr, tiktok, binance, visionengine. Send a POST request with {"type": "imagetotext", "image": ""} to the webhook URL. Full API docs at https://docs.captchasonic.com