Convert Excel to JSON Online

Converting Excel to JSON transforms spreadsheet data into a format consumed by web applications, APIs, and document databases. Each row becomes a JSON object with keys from the column headers, and the full output is a JSON array ready to feed into a JavaScript application, POST to an API, or bulk-insert into MongoDB or Firestore.

Common use cases include converting a product catalogue or content inventory maintained in Excel into a JSON file for a headless CMS or static site generator, transforming a business data export for a web application, and preparing lookup tables or reference data for use in code. JSON is also easier to diff and version-control than XLSX for configuration-like data.

Formulas in the Excel file are converted to their last calculated values. Excel date serial numbers become ISO 8601 date strings in the JSON output. If your spreadsheet has nested or hierarchical data spread across multiple columns, the JSON output will be a flat array of objects — use the SQL Query tool to build custom nested JSON structures if needed.