Convert XLSX to JSON
An XLSX sheet is a grid of rows and columns, but APIs and JavaScript apps want structured data. This converter turns your spreadsheet into an array of JSON objects — one object per row, with the header row becoming the keys. It all happens in your browser, so your data stays private.
Drop your .xlsx below and choose JSON.
Drop a spreadsheet or data file
or click to choose · XLSX, XLS, CSV, TSV, JSON, ODS — converted in your browser
Why convert XLSX to JSON?
- Get an array of row objects where the first row's headers become JSON keys — ready to drop straight into code.
- Feed spreadsheet data into REST APIs, config files, or front-end apps without manual retyping.
- Seed databases, mock services, or tests from a familiar spreadsheet instead of hand-writing JSON.
- Runs locally in your browser — internal data never touches a server.
How to convert XLSX to JSON
- 1Drop your .xlsx file into the converter below.
- 2Set the output format to JSON.
- 3Make sure your top row holds clean column headers — they become the object keys.
- 4Download or copy the JSON array. Everything runs in your browser, nothing is uploaded.
Frequently asked questions
How is the JSON structured?+
You get an array of objects, one per data row. Each object's keys come from the header row, and the values are the cells underneath — for example [{ "name": "Ada", "age": 36 }].
What if my first row isn't headers?+
The converter treats the first row as keys, so add a header row before converting. Without clear headers, your keys will be the first row of actual data.
Are dates and numbers kept as real values?+
Numbers are emitted as JSON numbers and text as strings. Dates may come through as serial numbers or formatted strings depending on the cell, so check date columns and reformat if needed.
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Need more than XLSX → JSON?
The full Spreadsheet Converter handles batches, resizing and more — all free and in your browser.