Want to convert API response JSON to CSV file?
Try Withdata Data File Converter, a JSON to CSV converter for Windows, Mac, and Linux, Convert JSON from RESTful API to CSV, 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.
Download Withdata DataFileConverter 
Convert API response JSON to CSV
Click “Start a New Convert” at task dialog.
then show the wizard.
Select source/target file type.
1. Input the RESTful API URL, and download to JSON file.
2. Open the saved JSON file.
3. Config target CSV file.
4. Set rows options.
5. Convert API response JSON to CSV.
See CSV file
Convert API response JSON to CSV in command line
Save “JSON to CSV” session, then you can:
- Convert API response JSON to CSV in Windows command line.
- Convert API response JSON to CSV in Linux command line.
- Convert API response JSON to CSV in macOS command line.
Set scheduled tasks for converting API response JSON to CSV
You can schedule and automate this converting task by:
- Save session and create .bat (Windows) or .sh (Linux/macOS) file for “API response JSON to CSV” conversion.
- Set scheduled task for “API response JSON to CSV” conversion.
FAQ
More about Withdata DataFileConverter – API JSON to CSV converter
Download Withdata DataFileConverter
JSON → CSV reference
Type mapping
| Value kind | in JSON | in CSV |
|---|---|---|
| Int | 1234 (number) | 1234 |
| Decimal | 1234.56 (number) | 1234.56 |
| Float | 1.234e10 (number) | 1.234e+10 |
| Text | "text" (string) | quoted only when it contains a comma or a quote |
| Long text | "multi-line\ntext" (escaped newline inside a string) | must be quoted; line breaks inside force multi-line records |
| Date | "2026-09-18" (string) | 2026-09-18 |
| Datetime | "2026-09-18T14:30:00Z" (string) | 2026-09-18 14:30:00 |
| Binary | "base64:..." (string) | not representable - base64 or hex string |
| Boolean | true / false (boolean) | TRUE / FALSE, or 1 / 0 depending on the writer |
| JSON | nested object or array, kept as structure | the whole JSON value quoted, with internal quotes doubled |
Dialect differences
Both JSON and CSV are file formats, so what differs below is how each one chooses to represent a value.
| Property | in JSON | in CSV |
|---|---|---|
| identifiers | Double quotes; backslash escapes | Double quotes; a literal quote is doubled ("" ) |
| dates | No date type: dates arrive as strings and the reader must p... | Conventional text: 2026-09-18 or 2026-09-18 14:30:00 |
| binary | Not supported natively - base64 inside a string | Not supported |
| separator | Braces and commas | Comma "," |
| encoding | UTF-8 by definition | No declaration - UTF-8 works only with a BOM |
| typing | string, number, boolean, null, object, array - no date type | None - every field is text |
| shape | Nested objects and arrays | Flat table, optional header row |
| ceiling | Whole document is usually parsed into memory | No formal limit; row count bounded by memory |
Data File Converter without the manual work
For batch jobs, large files and scheduling use the Data File Converter converter — an offline desktop app for Windows, Linux and macOS. Free trial.
