Is Konnect2Tools free?

Yes. These in-browser tools are completely free to use with no account required for core functionality.

Do my files leave my device?

Browser document operations run locally, except where the operation uses an external service, such as AI summarisation. Read the processing note before using sensitive inputs.

Is the Excel to JSON tool safe to use?

Local operations process document content on your device. External-service operations may send inputs as described in the processing note. Keep originals and inspect the output.

Can I choose which sheet to convert in a multi-sheet workbook?

Yes — the tool lists all sheets in the uploaded workbook and lets you select the one to convert. You can also convert all sheets simultaneously, producing a JSON object with sheet names as keys.

What happens with empty cells in the Excel data?

Empty cells are represented as null values or as missing keys in the JSON output, depending on the output mode setting. Null representation is safer for data integrity; missing keys keep the JSON cleaner.

How are Excel formulas handled during conversion?

Formulas are evaluated and their calculated values are exported to JSON — not the formula text itself. If formula results are error values (#REF, #DIV/0!), they appear as null or the error string in the JSON.

Can I convert a very large Excel file with 50,000+ rows?

Yes, but processing time increases with size. Files up to 50 MB are supported. For very large files, consider exporting only the required columns and rows to reduce processing time.

Developer & data utilities

Excel to JSON

Upload a sheet and get structured JSON.

Run Excel to JSON online

In-browserDocument processing runs on your device. External resources may still load.

Enable JavaScript to use the interactive tool. Read the instructions, limitations and FAQs below before starting.

Converting Excel data to JSON is a key step in integrating spreadsheet data with web applications, APIs, and databases. JSON is the standard data exchange format for modern software — converting your Excel table to JSON lets you load data into a web app, import it into MongoDB, submit it to an API, or use it in a JavaScript application without writing custom parsing code.

This tool reads your .xlsx or .xls file and generates a JSON array where each row becomes an object with the column headers as keys. You can choose the starting row (useful for spreadsheets with metadata rows above the data), select a specific sheet, and control output formatting (pretty-printed vs. minified).

Business users frequently maintain master data (products, employees, customers) in Excel and need to upload it to a web system or database. This conversion tool provides a clean JSON output that developers can use directly or import into a CMS, e-commerce platform, or API endpoint.

How to use this utility

Use the controls below—paste text, pick files, or adjust options as described on the tool.
Click the main action button. Processing runs in your browser on this device.
Download or copy the output. Check the processing note for any external services used by this operation.

Common use cases

Converting a product catalogue Excel sheet to JSON for import into a web store.
Exporting employee data from an HR spreadsheet to JSON for an HRMS import.
Converting a question bank Excel file to JSON for a quiz or LMS application.
Turning a configuration Excel file into a JSON config for a business application.
Converting a customer contact list from Excel to JSON for a CRM import.

Tips for best results

1Ensure your Excel sheet has proper column headers in the first row — these become the JSON object keys.
2Clean up data in Excel before converting: remove merged cells, resolve formula errors (#REF, #N/A), and standardise date formats.
3For large workbooks with multiple sheets, select the specific sheet to convert rather than converting all sheets simultaneously.
4Use Excel's 'Save as UTF-8 CSV' option for simple flat tables if JSON is not strictly required — CSVs are lighter and simpler for many import tools.
5After conversion, validate the JSON in a JSON validator (e.g., JSONLint) before using it in an application to catch encoding or structure issues.

Frequently asked questions

Is Konnect2Tools free?: Yes. These in-browser tools are completely free to use with no account required for core functionality.
Do my files leave my device?: Browser document operations run locally, except where the operation uses an external service, such as AI summarisation. Read the processing note before using sensitive inputs.
Is the Excel to JSON tool safe to use?: Local operations process document content on your device. External-service operations may send inputs as described in the processing note. Keep originals and inspect the output.
Can I choose which sheet to convert in a multi-sheet workbook?: Yes — the tool lists all sheets in the uploaded workbook and lets you select the one to convert. You can also convert all sheets simultaneously, producing a JSON object with sheet names as keys.
What happens with empty cells in the Excel data?: Empty cells are represented as null values or as missing keys in the JSON output, depending on the output mode setting. Null representation is safer for data integrity; missing keys keep the JSON cleaner.
How are Excel formulas handled during conversion?: Formulas are evaluated and their calculated values are exported to JSON — not the formula text itself. If formula results are error values (#REF, #DIV/0!), they appear as null or the error string in the JSON.
Can I convert a very large Excel file with 50,000+ rows?: Yes, but processing time increases with size. Files up to 50 MB are supported. For very large files, consider exporting only the required columns and rows to reduce processing time.

Continue with another utility in developer & data utilities.

Explore all categories

PDF hub Jobs & admissions Image hub Developer hub Finance hub Converters Business Health Real estate GST & tax HR & payroll Legal Design & marketing Education