Excel to JSON
Upload an Excel file (XLSX or XLS) and get back structured JSON — each row becomes an object, with the header row used as keys. Handy for feeding spreadsheet data into apps, APIs, and scripts without manual reformatting. Free to start.
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How it works
Upload your Excel file
Provide an XLSX or XLS file (CSV works too) with a header row at the top.
Choose the sheet and options
Name the sheet to convert and say how to handle types, dates, and empty rows.
Get structured JSON
Each row becomes an object using the header row as keys, returned as a clean JSON array.
Copy or download
Copy the JSON into your code, or download it to feed an app, API, or script.
Who is this for
Developers importing spreadsheet data
Turn a client's Excel file into JSON your app or API can ingest, without manual reformatting.
Data and ops teams
Convert exported spreadsheets into JSON for pipelines, scripts, and integrations.
No-code and automation builders
Get spreadsheet data into JSON to wire into automations and webhooks.
Six prompt-engineering tips that move the needle
Small changes in how you write a prompt make the biggest difference in output.
Keep a clean header row
A single, clear header row becomes your JSON keys — avoid merged cells or multiple header rows.
Name the sheet
If the workbook has several sheets, say which one to convert.
Specify date and number handling
Ask for ISO dates and numeric values kept as numbers to avoid ambiguous formatting.
Skip empty rows
Request that blank rows be skipped and whitespace trimmed for cleaner JSON.
Key by a column if useful
Ask for an object keyed by a unique ID column instead of a flat array for easy lookups.
Remove sensitive columns
Strip personal or financial columns before uploading if they aren't needed.
What to expect
For a clean spreadsheet with a header row, the tool returns a well-structured JSON array in under a minute, with one object per row. Consistent headers and tidy data give the best results. Merged cells, multiple header rows, or heavily formatted sheets are the main sources of messy output and may need cleanup first.
Example: A user uploaded a 'Customers' sheet with columns name, email, and signup_date and asked for a JSON array with ISO dates. The tool returned an array of objects using those three headers as keys, emails as strings, and signup_date values formatted as ISO date strings.
Good to know
- Merged cells, multiple header rows, or sheets with notes and blank sections can produce messy JSON and may need cleaning first.
- Spreadsheet number and date formatting can be ambiguous — specify how you want them handled to avoid surprises.
- Very large workbooks may take longer or be better converted one sheet at a time.
Frequently asked questions
What does an Excel to JSON converter do?
It reads a spreadsheet and outputs JSON, typically as an array of objects where each row is one object and the header row supplies the keys. This makes spreadsheet data usable in code, APIs, and apps.
Which file formats can I upload?
Common Excel formats like XLSX and XLS work. If you have a CSV, it can be converted too, though CSV has no built-in types so everything comes through as text unless inferred.
How are multiple sheets handled?
You can convert a specific sheet by naming it, or convert the first sheet by default. If you need several sheets, ask for them as separate JSON outputs or a combined object keyed by sheet name.
Are numbers and dates preserved?
Numbers can be kept as numeric values rather than strings, and dates can be output in ISO format. Mention how you want dates and numbers handled, since spreadsheets store them in ways that can be ambiguous.
What happens to empty cells and rows?
You can choose to skip empty rows and to represent empty cells as null or as empty strings. Whitespace can be trimmed from text cells so the JSON is clean.
Can I key the JSON by a column instead of an array?
Yes — instead of a flat array, you can get an object keyed by a unique column (like an ID), which is handy for lookups. Just make sure that column's values are unique.
Is my data private?
Your file is used only to produce the JSON and isn't published. Avoid uploading spreadsheets with sensitive personal or financial data, or remove those columns first.
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