Batch convert CSV files to JSON files

Shiji Pan

1 year ago

Want to batch convert CSV files to JSON files?

Try Withdata Data File Converter, a desktop CSV to JSON converter for Windows, MacOS, and Linux, Batch convert CSV 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 CSV 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” “CSV” To “Files” “JSON”.

And config the first source CSV file.

List source CSV files.

After converting, you can view output JSON files.

CSV → JSON reference

Value kind	in CSV	in JSON
Int	`1234`	`1234 (number)`
Decimal	`1234.56`	`1234.56 (number)`
Float	`1.234e+10`	`1.234e10 (number)`
Text	`quoted only when it contains a comma or a quote`	`"text" (string)`
Long text	`must be quoted; line breaks inside force multi-line records`	`"multi-line\ntext" (escaped newline inside a string)`
Date	`2026-09-18`	`"2026-09-18" (string)`
Datetime	`2026-09-18 14:30:00`	`"2026-09-18T14:30:00Z" (string)`
Binary	`not representable - base64 or hex string`	`"base64:..." (string)`
Boolean	`TRUE / FALSE, or 1 / 0 depending on the writer`	`true / false (boolean)`
JSON	`the whole JSON value quoted, with internal quotes doubled`	`nested object or array, kept as structure`

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

Property	in CSV	in JSON
identifiers	`Double quotes; a literal quote is doubled ("" )`	`Double quotes; backslash escapes`
dates	`Conventional text: 2026-09-18 or 2026-09-18 14:30:00`	`No date type: dates arrive as strings and the reader must p...`
binary	`Not supported`	`Not supported natively - base64 inside a string`
separator	`Comma ","`	`Braces and commas`
encoding	`No declaration - UTF-8 works only with a BOM`	`UTF-8 by definition`
typing	`None - every field is text`	`string, number, boolean, null, object, array - no date type`
shape	`Flat table, optional header row`	`Nested objects and arrays`
ceiling	`No formal limit; row count bounded by memory`	`Whole document is usually parsed into memory`

For batch jobs, large files and scheduling use the Data File Converter converter — an offline desktop app for Windows, Linux and macOS. Free trial.