Sometimes you need to convert large JSON files to other formats, like CSV, TSV, TXT, Excel, XML, or SQL.
If you don’t like to program, you can try Withdata Data File Converter, a native GUI JSON to CSV converter for Windows, Linux, and macOS, you can convert large JSON to CSV easily.
- 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 JSON file(s) to online services.
Download DataFileConverter
Windows 64 bit
Windows 32 bit
Linux .deb (For Debian, Ubuntu) 64 bit
Linux .rpm (For Red Hat, Fedora, SUSE) 64 bit
MacOS 64 bit
A huge JSON file for test, 8M_lines.json 6.38 GB.
You can open it in Big Text File Viewer to see the content.
Convert large JSON file to CSV file
Run DataFileConverter, click “Start a New Convert”.
From “JSON”, To “CSV”.
You can convert to other formats also, TXT, TSV, Excel, XML, Html, or SQL.
Open the big JSON file.
Set CSV file.
Summary.
Convert large JSON to CSV.
Convert large JSON to CSV in command line
Save “large JSON to CSV” session, then you can:
- Convert large JSON to CSV in Windows command line.
- Convert large JSON to CSV in Linux command line.
- Convert large JSON to CSV in macOS command line.
Set scheduled tasks for converting large JSON to CSV
You can schedule and automate this “large JSON to CSV” conversion task by:
1) Save session and create .bat (Windows) or .sh (Linux/macOS) file.
More about DataFileConverter – Large JSON to CSV Converter
Download DataFileConverter
Windows 64 bit
Windows 32 bit
Linux .deb (For Debian, Ubuntu) 64 bit
Linux .rpm (For Red Hat, Fedora, SUSE) 64 bit
MacOS 64 bit
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 |
Convert your data online, free
Free in-browser converters for CSV, Excel, JSON, XML and SQL: Withdata Online Data Conversion. Large files, batch conversion or scheduling? See the offline desktop apps, or browse all data conversion tools.