Excel to JSON
About Tool
Moving data from a spreadsheet into a web application often requires a bridge between tabular rows and JSON objects. This converter handles that transition seamlessly, allowing you to either Import Spreadsheet (.xlsx, .csv) files directly or Paste Tabular Data (such as cells copied directly from Excel or Google Sheets). It is an essential utility for developers populating databases or creating mock API responses from business requirements.
Versatile Input Methods
Whether you have a file on your hard drive or just a few rows copied to your clipboard, the tool is ready. For file imports, it supports both .xlsx and .csv. If you prefer pasting, it handles tab-separated values automatically. Once the data is in, the Header Mapping feature allows you to decide how the data is structured. If your source data is currently trapped in a database format, you might use CSV to SQL to move it elsewhere, but for code-level integration, this JSON output is the standard.
Structure Your JSON Output
You have control over the final shape of your data. Selecting First Row as Keys (Objects) creates an array of objects where the column headers become the property names—ideal for most modern programming tasks. Alternatively, No Header (Arrays) produces an array of arrays, which can be useful for simpler data processing or mathematical operations. If you need to grab specific columns from a massive spreadsheet before converting, you might find the Table to CSV tool useful for isolating data first.
Efficiency and Privacy
The JSON Output is formatted with indentation for immediate readability. You can Copy JSON to your clipboard with one click, bypassing the need for manual file saving. Like all Simple.Tools utilities, the processing happens locally. Your spreadsheet data—whether it contains financial figures or personal contact lists—is read by the browser and never transmitted to any external server, ensuring your data security is never compromised.
Frequently Asked Questions
Can I convert multiple sheets from one Excel file?
The tool typically processes the first active sheet in an .xlsx file. For multiple sheets, it is best to save them as separate CSVs or copy-paste the data sheet by sheet.
Does it handle dates and currency symbols?
Yes, though they are usually converted to string representations. You can then use your code logic to parse them into specific date or number types.
What happens if my header names have spaces?
The spaces will be included in the JSON keys (e.g., "First Name": "John"). Most developers prefer to clean headers in the spreadsheet first to use camelCase or underscores.
How many rows can I paste at once?
You can paste thousands of rows, but the performance will depend on your computer's RAM. For extremely large files, using the "Import" function is often more stable than pasting.
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