n8n PDF Form Workflow Updated to Fix Incorrect Field Matching Bug

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A developer has released a corrected version of an n8n workflow designed to fill existing PDF forms using the JustFill API service. The previous version contained a flawed fallback mechanism that used partial string matching, which could place values in incorrect form fields without alerting the user. The updated workflow now requires exact field name matches after Unicode normalization, meaning names like 'total' and 'subtotal' will no longer be confused. The revised logic also rejects ambiguous field names, unknown input keys, and unsupported data types such as arrays or nested objects. The corrected workflow JSON is available on GitHub and was verified against live API responses on September 5, 2026, with all three test values appearing in the correct fields.

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