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Try excel live

Convert JSON, CSV, YAML, Markdown or SQL to a real .xlsx and back, inspect a workbook, add a formula column, or download a ready-to-fill template. It runs the published @lacspace/convert, @lacspace/formula and lacspace-excel engines entirely in your browser — nothing is uploaded.

From→Toflatten nestedor a file (.xlsx / .csv / .json …)

Input (paste JSON, CSV, YAML, Markdown table or SQL)

lacspace-excel convert data.json --to xlsx --flatten -o data.xlsx

Your data never leaves your machine. The CLI adds stdin/stdout piping, dedupe, split/merge and a function reference.

Install from npm ↗Read the full docs Formula reference