Build columns from first-seen object keys, serialize scalar values, and guard formula-like text for safer spreadsheet import.
Inputs are limited to 1 MiB, 10,000 rows, and 256 columns.
Nothing is placed in a URL, account, or remote log.
Strict, bounded, local processing
Nested arrays and objects are rejected because flattening them requires a deliberate data-model policy.
The input must be a non-empty array of objects. Headers follow the first appearance of each key across the array, missing members become empty cells, and null also becomes an empty cell.
Strings, finite numbers, and booleans are supported. A nested value stops conversion instead of being flattened ambiguously.
Spreadsheet programs may interpret cells beginning with equals, plus, minus, or at-sign characters as formulas. The converter prefixes those values with an apostrophe before serialization.
