JSON to XLSX Converter
Convert JSON data into a Microsoft Excel XLSX file with automatic column sizing, a frozen header row, and header styling.
Excel Options
Recommended Settings
Pro Tips
- •Numbers and booleans in your JSON become real numeric and boolean cells in Excel, not text
- •Columns are built from the union of keys across every object in the array
- •Nested objects and arrays are stored as JSON strings in a single cell
- •Frozen headers stay visible when scrolling through large datasets
- •Header styling makes data tables more professional and readable
Most Popular
Most users enable all options for professional, Excel-ready spreadsheets
When to Use This Tool
Convert JSON API responses or exports into professional Excel spreadsheets for business reports, financial analysis, and executive dashboards.
Transform JSON datasets into Excel files for sharing with colleagues, clients, or stakeholders who prefer working in spreadsheets over raw JSON.
Prepare JSON data for advanced Excel features like pivot tables, charts, and conditional formatting - things that aren't possible with plain JSON.
Save JSON responses from APIs or webhooks as Excel files for record-keeping, auditing, or handoff to non-technical team members.
How It Works
Parse the JSON input and detect whether it's an array of objects, a single object, or a list of values
Build column headers from the union of object keys, or use Key/Value columns for a single object
Convert rows into a worksheet, preserving numbers and booleans as native Excel cell types
Calculate optimal column widths based on content length if enabled
Apply a frozen header pane and header styling (bold, blue background) if enabled
Generate a native Excel XLSX file using the SheetJS library and trigger the download
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by SheetJS (xlsx) for optimal performance on modern browsers.
Secure
No data collection, no tracking, no sign-up required.
Frequently Asked Questions
What JSON structures does this tool support?
Arrays of objects (rendered as a multi-column sheet), a single flat object (rendered as a Key/Value sheet), and arrays of primitive values (rendered as a single-column sheet) are all supported.
Are numbers and booleans preserved as real Excel types?
Yes. Unlike a CSV conversion where everything becomes text, numeric and boolean values from your JSON are written as native numeric and boolean cells in the spreadsheet, so they sort and calculate correctly in Excel.
What happens to nested objects or arrays?
Nested values are converted to compact JSON strings inside their cell, since a spreadsheet is inherently flat. Flatten your JSON beforehand if you need nested fields broken into separate columns.
What does 'freeze header row' do?
It's an Excel feature that keeps the first row visible while you scroll down through large datasets, so column names stay in view no matter where you are in the spreadsheet.
Can I add multiple sheets to the Excel file?
This tool creates a single-sheet Excel file. If you need multiple sheets, open the generated file in Excel and add more manually, or convert separate JSON files and combine the resulting workbooks.