XLSX to JSON Converter

Convert Excel XLSX files to JSON format with customizable structure options. Choose between array of objects or array of arrays format.

Overview

XLSX to JSON Converter turns Excel spreadsheets into clean, developer-ready JSON entirely inside your browser — your file never leaves your device. Drop in an .xlsx or legacy .xls file, pick your output structure (array of objects with column headers as keys, or a flat array of arrays), and get a formatted JSON file ready to download in seconds. Because everything runs locally via WebAssembly, there is no upload step, no account required, and no waiting on a remote server — making it safe to use with confidential business data or personally identifiable information.

Key Features

  • Convert XLSX to JSON format
  • Array of objects or arrays
  • Pretty print JSON output
  • Support for multiple sheets
  • Preview before conversion

Common Use Cases

  • API & Backend Development — Developers convert exported spreadsheet data to JSON so it can be seeded into a database, passed to a REST API, or bundled as a static data file.
  • Data Analysis Prep — Analysts transform Excel reports into JSON to feed downstream tools like Python scripts, Node.js pipelines, or no-code automation platforms that require structured JSON input.
  • Confidential Business Data — Finance and HR teams convert sensitive payroll or budget spreadsheets without risking exposure — the file never leaves the local machine.
  • Multi-Sheet Workbook Conversion — Power users with multi-tab Excel workbooks convert individual sheets to separate JSON objects, keeping the data structure intact for further processing.
  • Front-End Mock Data — UI developers use real spreadsheet exports as JSON fixtures for prototyping or unit tests, skipping manual JSON authoring.

How It Works
1

Upload XLSX File

Select your Excel XLSX file from your device. The tool supports both .xlsx and legacy .xls formats.

2

Choose Output Format

Select between array of objects (with column headers as keys) or array of arrays format. Preview the JSON structure.

3

Download JSON

Review the converted JSON data and download the formatted file instantly to your device.

Frequently Asked Questions

What Excel file formats are supported?
We support both modern XLSX files (.xlsx) and legacy Excel files (.xls). The tool automatically detects the format and processes accordingly.

Can I convert files with multiple sheets?
Yes, the tool can handle Excel files with multiple sheets. You can choose which sheet to convert or convert all sheets into separate JSON objects.

What's the difference between output formats?
Array of objects format creates JSON where each row becomes an object with column headers as property names. Array of arrays format creates a simple nested array structure where each row is an array of values.

Is there a file size limit?
The tool can handle Excel files up to 50MB. For larger files, consider splitting them into smaller workbooks before conversion.

How are empty cells handled?
Empty cells are converted to null values in JSON. You can choose to exclude empty cells or keep them as null values depending on your needs.

Can I preview the JSON before downloading?
Yes, the tool provides a live preview of the converted JSON data so you can verify the structure and content before downloading the file.

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