Common Errors in n8n 🚩 JSON Syntax & Expression Mistakes A huge amount of n8n issues come from JSON syntax errors, especially when expressions slip into normal JSON fields. The biggest trap? Using the “=” sign inside expressions as if it were JavaScript assignment. In n8n, that breaks your workflow instantly. Typical problems: • Using = instead of == or === • Missing commas in objects • Unquoted strings • Mixing expression mode with plain JSON without noticing • Dropping raw = into JSON fields