Batch convert Excel files to JSON files

Shiji Pan

1 year ago

Want to batch convert Excel files to JSON files?

Try Withdata Data File Converter, a desktop Excel to JSON converter for Windows, MacOS, and Linux, Batch convert Excel to JSON, Easy and Fast.

Can run in GUI mode, Step by Step, just a few mouse clicks.
Can run in Command line, for Scheduled Tasks and Streams.
Convert files locally and privately, avoid uploading large Excel file(s) to online services.
Support Windows, Linux, and macOS.

Click “Start a New Convert” at task dialog.

then show the wizard.

Select From “Files” “Excel” To “Files” “JSON”.

And config the first source Excel file.

List source Excel files.

After converting, you can view output JSON files.

EXCEL → JSON reference

Value kind	in EXCEL	in JSON
Int	`1234 (a real numeric cell)`	`1234 (number)`
Bigint	`9007199254740993 (exact only while the cell stays text)`	`9007199254740993`
Decimal	`1234.56 (numeric cell, format controls the displayed decimals)`	`1234.56 (number)`
Float	`1.234E+10 (numeric cell)`	`1.234e10 (number)`
Text	`text cell; leading zeros survive only if the column is text`	`"text" (string)`
Long text	`text cell; wraps inside the cell rather than the row`	`"multi-line\ntext" (escaped newline inside a string)`
Date	`a serial number plus a date cell format`	`"2026-09-18" (string)`
Datetime	`a serial number plus a date-time cell format`	`"2026-09-18T14:30:00Z" (string)`
Binary	`not representable as data`	`"base64:..." (string)`
Boolean	`TRUE / FALSE (a real boolean cell)`	`true / false (boolean)`
JSON	`a text cell; the quotes are part of the value`	`nested object or array, kept as structure`

Both EXCEL and JSON are file formats, so what differs below is how each one chooses to represent a value.

Property	in EXCEL	in JSON
identifiers	`Not applicable; a cell holds exactly one value`	`Double quotes; backslash escapes`
dates	`Stored as a serial number; only the cell format makes it lo...`	`No date type: dates arrive as strings and the reader must p...`
binary	`Only as text or an embedded object, not as a data column`	`Not supported natively - base64 inside a string`
separator	`Cells, not delimiters`	`Braces and commas`
encoding	`UTF-8 internally, declared in the package`	`UTF-8 by definition`
typing	`Real cell types: text, number, date, boolean, error`	`string, number, boolean, null, object, array - no date type`
shape	`Multiple sheets, each a flat grid`	`Nested objects and arrays`
ceiling	`1,048,576 rows x 16,384 columns per sheet; 255 sheets per w...`	`Whole document is usually parsed into memory`

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