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Transform your Excel spreadsheets into structured JSON data for APIs and applications.
Upload your Excel file (XLSX or XLS)
Headers are automatically detected as JSON keys
Click "Convert to JSON" to transform the data
Download or copy the JSON output
Automatic header detection for JSON keys
Preserves data types (numbers, dates, text)
Clean JSON array of objects output
Handles large spreadsheets efficiently
Perfect for API data preparation
Excel stores dates as serial numbers internally. Our converter detects date-formatted cells and converts them to ISO 8601 format strings (e.g., "2026-03-15") in the JSON output for universal compatibility.
Currently the first sheet is converted. Multi-sheet support with separate JSON objects per sheet is planned.
Merged cells are resolved to the top-left value. The merged region is treated as a single cell with the value assigned to the first row/column of the merge.
Formula results (computed values) are exported to JSON, not the formula expressions themselves. This ensures the JSON contains the actual data.
Excel files (XLSX) use the Office Open XML format (ISO/IEC 29500) and store data in a rich, typed spreadsheet model with support for formulas, formatting, and multiple sheets. JSON (JavaScript Object Notation, RFC 8259) is a lightweight text-based format ideal for APIs and applications. Converting Excel to JSON bridges the gap between desktop spreadsheet workflows and modern web development — making it easy to ingest spreadsheet data into REST APIs, JavaScript applications, and NoSQL databases.
This tool is particularly useful when: