Want to convert CSV file to JSON file?
Try Withdata Data File Converter, a desktop CSV to JSON converter for Windows, MacOS, and Linux, 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.
Download Withdata DataFileConverter 
Convert CSV to JSON
Choose CSV file -> Set JSON file -> Convert CSV to JSON
“Start a New Convert” for “CSV to JSON”.
Select From “File” “CSV” To “File” “JSON”.
1. Open source CSV file.
Support large CSV file ( > 4GB ).
Source CSV file’s content is like this:
2. Config target JSON file.
3. Set rows options.
4. Convert CSV to JSON.
After converting, you can view the output JSON file.
More about CSV to JSON converter
Download Withdata DataFileConverter
See Video: Convert CSV file to JSON file
See also:
- Merge multiple CSV files into one JSON
- Batch convert CSV files to JSON files
- Convert CSV to JSON Online for Free
CSV → JSON reference
Type mapping
| 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 |
Dialect differences
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 |
Do it online, free
Skip the manual work — convert CSV to JSON online, free (runs in your browser, nothing is uploaded). For large files or batch jobs, use the desktop apps.
