Export PostgreSQL table to JSON using dynamic filename with current date

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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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.

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More about PostgreSQL to JSON converter

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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