FatBabyAPI

Spreadsheets API

Convert, inspect, merge, and split Excel workbooks with one API key and the same credit wallet.

Get an API keyBrowse endpoints

Capabilities

8 live sync operations under /v1/sheets.

XLSX info

1 cr

Inspect workbook sheets, row counts, and size

/v1/sheets/xlsx-info

XLSX to CSV

1 cr

Convert a worksheet to CSV text

/v1/sheets/xlsx-to-csv

CSV to XLSX

1 cr

Convert CSV text or file to an XLSX workbook

/v1/sheets/csv-to-xlsx

XLSX to JSON

1 cr

Convert a worksheet to header + row objects

/v1/sheets/xlsx-to-json

JSON to XLSX

1 cr

Build an XLSX workbook from row objects or multi-sheet input

/v1/sheets/json-to-xlsx

Merge sheets

2 cr

Combine worksheets from multiple XLSX files into one workbook

/v1/sheets/merge-sheets

Split sheets

2 cr

Split each worksheet into its own XLSX (base64 JSON map)

/v1/sheets/split-sheets

Validate workbook

1 cr

Validate XLSX structure against size/sheet/row limits

/v1/sheets/validate
View all Spreadsheet endpointsDocumentation

Quick example

Convert an XLSX worksheet to JSON.

curl -X POST https://thefatbaby.com/api/v1/sheets/xlsx-to-json \
  -H "Authorization: Bearer fb_live_YOUR_KEY" \
  -F "file=@workbook.xlsx"
# → { "sheet": "Sheet1", "headers": [...], "rows": [...] }
Spreadsheets API · FatBaby API