n8n Eliminates Code-Heavy Excel Generation with Native API

n8n previously lacked native XLSX generation, forcing users into painful workarounds—writing ExcelJS code cell-by-cell, creating temporary Google Sheets intermediaries, or rendering HTML-to-XLSX with Puppeteer. The new Iteration Layer Sheet Generation API changes this fundamentally: users define spreadsheets declaratively in JSON and receive formatted Excel files with multiple sheets, formulas, and styling. This enables practical automations like database-to-email reporting workflows using just a few nodes, eliminating code complexity and external dependencies entirely.