Want to export data from PostgreSQL table to JSON using current date as file name?
Try Withdata DBToFile, a PostgreSQL to JSON converter for Windows, Linux, and macOS, Export PostgreSQL data to JSON, Easy and Fast.
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- Support Windows, Linux, and macOS.
Export data from PostgreSQL table to JSON file using dynamic filename with date and time
Login to PostgreSQL -> Choose PostgreSQL table -> Set JSON filename template including date -> Export PostgreSQL to JSON using current date as file name
Choose PostgreSQL and logon.
“Export From Table” for “JSON to PostgreSQL“.
Select JSON file type.
1. Choose PostgreSQL table.
2. Set JSON file options. Enter filename template, including date, #yyyy# is for current year, #mm# month, #dd# day, #hh# hour, #mi# minute, #ss# second.
3. Set rows options.
4. Export PostgreSQL table data to JSON file. Dynamically created JSON file name using present system time.
After exporting, you can view output JSON files.
More about PostgreSQL to JSON converter
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PostgreSQL → JSON reference
Type mapping
| Value kind | in PostgreSQL | in JSON |
|---|---|---|
| Int | integer | 1234 (number) |
| Bigint | bigint | 9007199254740993 |
| Decimal | numeric(p,s) | 1234.56 (number) |
| Float | double precision | 1.234e10 (number) |
| Text | varchar(n) | "text" (string) |
| Long text | text | "multi-line\ntext" (escaped newline inside a string) |
| Date | date | "2026-09-18" (string) |
| Datetime | timestamp | "2026-09-18T14:30:00Z" (string) |
| Binary | bytea | "base64:..." (string) |
| Boolean | boolean | true / false (boolean) |
| JSON | jsonb | nested object or array, kept as structure |
Dialect differences
PostgreSQL is a database server and JSON is a file format, so the gap is wider than a dialect difference – the rows below are where values and structure stop lining up.
| Property | in PostgreSQL | in JSON |
|---|---|---|
| port | 5432 | — |
| identifiers | "double quotes" | Double quotes; backslash escapes |
| row limit | LIMIT n | — |
| dates | timestamp, timestamptz, date, time | No date type: dates arrive as strings and the reader must p... |
| long text | TEXT | — |
| binary | BYTEA | Not supported natively - base64 inside a string |
| separator | — | Braces and commas |
| encoding | — | UTF-8 by definition |
| typing | — | string, number, boolean, null, object, array - no date type |
| shape | Tables of rows and columns | Nested objects and arrays |
| ceiling | — | Whole document is usually parsed into memory |
Command line
| Side | Command |
|---|---|
| PostgreSQL | pg_dump or COPY ... TO |
| PostgreSQL (load) | COPY ... FROM |
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