Convert JSON to Excel in Seconds

JSON is how most APIs and modern apps hand off data, but the people who actually need to look at that data — a manager, a client, a support lead — usually reach for a spreadsheet, not a JSON viewer. Converting to XLSX turns an API response or export into something that opens as an ordinary workbook, with each record's fields already sitting in their own columns.

The flattening step is what makes this more useful than just pasting JSON text into a cell: a nested object like a customer's name and email splits into its own columns automatically, so building a pivot table or a simple filter in Excel doesn't require anyone to first understand the original JSON's shape. Numbers and true/false values keep their real type too, so a quantity or is_active column behaves like one from the moment the file opens.

This tends to matter most for developers and analysts handing data off to someone non-technical — a ticket export from a support tool, a report pulled from an internal API, a dataset a script produced — who needs Excel, not JSON. Because the parsing and workbook-building both happen inside your browser tab, the JSON file being converted never leaves your device during the process.

A spreadsheet has no way to put an object inside a cell — every cell holds a single value — so the first thing this tool has to do with a JSON array of objects is decide how to flatten anything that isn't already flat. Per RFC 8259, the specification that formally defines JSON (read RFC 8259), an object's values can themselves be objects, arrays, strings, numbers, booleans, or null, all nested arbitrarily deep — nothing in the format limits how far that nesting can go. This tool flattens one level of nested objects into their own dot-notation columns, so a record with a nested "customer": {"name": "Jane", "email": "[email protected]"} field becomes two columns, customer.name and customer.email, sitting right alongside the record's other top-level fields.

Native JSON types carry straight through into real Excel types wherever a value is simple enough to represent as one: a JSON number becomes a numeric cell ready for a SUM formula, and true/false becomes an actual Excel boolean rather than the text "true". What doesn't flatten as cleanly is an array of objects nested inside a record — several line items inside one order, say — which gets folded into a single cell as compact, semicolon-separated JSON text rather than expanded into more rows or columns, since per Microsoft's documentation of the Open XML formats XLSX is built on (see Microsoft's format guide), a single worksheet cell has no concept of holding a sub-table of its own. The output is one workbook, one sheet, with no formulas or cell styling — none of which JSON ever specified in the first place.