That tool help you decode and understand what is stored by CMP as defined by IAB Europe.
⚠️ That tool is deprecated since it works only for TCF v1, now obsolete. You could now use iabtcf.com
You can find the vendorlist on the GDPR Transparency and Consent Framework repository.
Here’s a « demo » consent data string : BOPpXYgOPpXYgAAABBFRBC-AAAAcR7_______9______9uz_Gv_r_f__33e8_39v_h_7_-___m_-3zV4-_1vV11yPg1urfIr1NpjQ6OGgA