FatBabyAPI

Spreadsheets API

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

Get an API keySpreadsheet API landingBrowse endpoints

About the Spreadsheets API

Use FatBaby sheets endpoints to convert XLSX/CSV, inspect workbook structure, merge or split worksheets, and move tabular data into JSON for apps and pipelines. Operations are sync by default under /v1/sheets, share the same credit wallet as PDF and media APIs, and reject invalid uploads before charging whenever possible.

See the Spreadsheet API landing for curl/SDK samples, or browse live tools under Tools. Authenticate with Authorization: Bearer fb_live_… against https://www.thefatbaby.com/api.

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": [...] }