Convert Excel to JSON – Generate API‑Ready JSON from Spreadsheets

Excel to JSON Converter – XLSX / XLS to JSON
Upload an Excel file (.xlsx or .xls), preview and edit the data.
Uploaded Excel file content will appear here. You can edit the table before generating JSON.
✅ JSON ready – copy or download below
JSON Output – Copy or Download
Clean, formatted JSON generated from your Excel file. Perfect for APIs, web apps, and backend systems.

Convert Excel to JSON online in seconds – completely free, no signup. This browser‑based tool turns any Excel spreadsheet (.xlsx or .xls) into clean, structured JSON format. The first row becomes JSON keys, and each subsequent row becomes an object in an array. Perfect for APIs, web applications, backend systems, and data migration.

Why convert Excel to JSON?

  • Prepare Excel data for REST APIs and web services
  • Load spreadsheet data directly into JavaScript frontends (React, Vue, Angular)
  • Migrate Excel sheets to NoSQL databases like MongoDB or Firebase
  • Automate data transformation for ETL pipelines and scripts
  • Clean and restructure tabular data into developer‑friendly JSON format

How to convert Excel to JSON – 3 simple steps

  1. Upload your Excel file – click “Upload Excel File” and select any .xlsx or .xls file from your computer.
  2. Preview and edit – see the spreadsheet data in an editable table; the first row is automatically used as JSON keys.
  3. Generate JSON – click “Convert to JSON”, then copy the formatted JSON or download as a .json file.

Excel to JSON converter – features you’ll love

  • ✅ 100% browser‑based – no upload, no server, no privacy concerns
  • ✅ Supports both .xlsx and .xls – works with modern and legacy Excel files
  • ✅ Automatic key mapping – first row becomes JSON object keys
  • ✅ Clean, indented JSON output – human‑readable, ready for integration
  • ✅ Editable preview table – change data before generating JSON
  • ✅ Copy to clipboard or download .json – flexible output
  • ✅ Works offline after first load – no internet needed
  • ✅ Handles large Excel files – browser memory permitting

Why DataFrog’s Excel to JSON tool stands out

  • Privacy first – your Excel file never leaves your device. Many converters upload your data – we don’t.
  • Production‑ready JSON – generates standard array‑of‑objects format, ready for APIs and JavaScript.
  • Editable preview table – you can modify, add, or delete rows before generating JSON.
  • Preserves Excel structure – headers map directly to keys, data types are inferred where possible.
  • No signup, no limits – convert as many files as you want, any size.

Supported Excel formats

  • Microsoft Excel .xlsx (Excel 2007 and later)
  • Microsoft Excel .xls (Excel 97-2003)
  • Single‑sheet workbooks (first worksheet is used)
  • Tabular data with headers (first row becomes JSON keys)

Common use cases for Excel to JSON conversion

  • 🌐 API data preparation – feed Excel data as JSON to any endpoint
  • 📱 Mobile app backend – convert spreadsheet data into JSON for mobile consumption
  • 🗄️ Database seeding – import Excel data into NoSQL databases
  • 🔄 Data migration – move spreadsheet content to JSON‑based storage
  • ⚙️ Automation pipelines – feed Excel exports into JavaScript automation scripts

Privacy & Security

  • 🔒 All processing happens locally in your browser
  • 🚫 No file upload – your data never touches our server
  • 🕵️ No tracking, no logs, no third‑party scripts
  • 💼 Safe for sensitive data (financial, personal, proprietary)

Frequently asked questions (Excel to JSON)

Does this tool support multiple sheets in an Excel file?

Currently, the tool converts only the first worksheet of your Excel file. If you need to convert other sheets, open the file and save each sheet as a separate Excel file, or use a dedicated multi‑sheet converter.

Is my Excel file uploaded to a server?

No. The tool runs entirely in your browser using the SheetJS library. Your file never leaves your computer – that’s why it works offline too.

Can I edit the Excel data before converting to JSON?

Absolutely. The preview table is fully editable. You can change cell values, insert or delete rows, and even rename headers – then generate JSON from the modified data. All live in your browser.

Is the generated JSON formatted for readability?

Yes, the output is indented with spaces (pretty‑printed) so it’s easy to read and debug. You can also minify it later if needed.

Does it preserve data types like numbers, booleans, and dates?

The tool automatically detects numbers and converts them to JSON numbers. Dates are converted to strings (ISO format if recognized). All other values become strings or null for empty cells.

Is this Excel to JSON converter really free?

Yes, completely free. No hidden fees, no premium tiers, no watermarks. DataFrog believes essential tools should be accessible to everyone.