Excel to JSON Converter
Convert any Excel spreadsheet to JSON instantly. Choose whether to use the first row as object keys, preview the output, and copy to clipboard or download. Your file never leaves your browser.
Drop your Excel file here
or click to browse — .xlsx, .xls, .xlsm, .xlsb
100% private — your file never leaves your browser
When to Convert Excel to JSON
JSON is the standard data format for web APIs, databases, and JavaScript applications. Converting Excel data to JSON is a common step in software development and data engineering workflows:
- Seeding a database: Convert a spreadsheet of products, users, or settings directly to JSON for a MongoDB, Firebase, or PostgreSQL (via JSON import) insert
- Building an API: Turn a spreadsheet maintained by a business team into a JSON data source for a REST or GraphQL API
- Configuration files: Export structured Excel tables to JSON config files used by applications
- Data migration: Convert legacy spreadsheet data to JSON for import into a modern system
- Frontend data: Many JavaScript charting libraries (Chart.js, D3, Recharts) consume JSON directly
Frequently Asked Questions
What does "First row as keys" mean?
When enabled, the first row of your spreadsheet is used as the property names (keys) in each JSON object. For example, if your columns are Name, Email, Age — each row becomes {"Name":"John","Email":"john@example.com","Age":30}. When disabled, each row becomes a plain array like ["John","john@example.com",30].
What is the difference between pretty print and minified?
Pretty print adds indentation and line breaks to make the JSON human-readable. Minified removes all whitespace to produce the smallest possible file — useful for APIs and data pipelines.
Are my files uploaded to a server?
No. Everything runs in your browser. Your file never leaves your device.
What data types are preserved?
Numbers are preserved as numbers (not strings), and blank cells are skipped when the "Skip empty cells" option is on. Date cells are converted to date strings. Everything else is preserved as its original value.
Can I convert multiple sheets?
Yes — if your file has multiple sheets, use the sheet selector that appears after upload to switch between sheets and download a separate JSON for each.