Parse JSON from open RESTful API and save to PostgreSQL

Want to parse JSON from open RESTful API and save to PostgreSQL database?

Try Withdata FileToDB, a desktop JSON to PostgreSQL converter for Windows, MacOS, and Linux, Import JSON to PostgreSQL, 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 FileToDB
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

Import JSON from open RESTful API to PostgreSQL database

Choose PostgreSQL and logon.

Click “Wizard – 1 File To 1 Table” at task dialog.

Select “Source File From” with “Url”.

1. Input the RESTful API URL, and download to JSON file.

2. Open the saved JSON file.

3. Config target PostgreSQL database.

You can create new PostgreSQL table by JSON struct, just a few mouse clicks.

Select table and config fields.

4. Summary.

5. Import RESTful JSON to PostgreSQL.

See importing results in PostgreSQL table

Import API JSON_API to PostgreSQL in command line

Save “JSON_API to PostgreSQL” session, then you can:

• Import API JSON_API to PostgreSQL in Windows command line.
• Import API JSON_API to PostgreSQL in Linux command line.
• Import API JSON_API to PostgreSQL in macOS command line.

Set scheduled tasks for importing API JSON_API to PostgreSQL

You can schedule and automate this importing task by:

1. Save session and create .bat (Windows) or .sh (Linux/macOS) file for “JSON to PostgreSQL” conversion.
2. Set scheduled task for “JSON to PostgreSQL” conversion.

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More about FileToDB – JSON to PostgreSQL converter

JSON → PostgreSQL reference

Type mapping

Value kind	in JSON	in PostgreSQL
Int	1234 (number)	integer
Bigint	9007199254740993	bigint
Decimal	1234.56 (number)	numeric(p,s)
Float	1.234e10 (number)	double precision
Text	"text" (string)	varchar(n)
Long text	"multi-line\ntext" (escaped newline inside a string)	text
Date	"2026-09-18" (string)	date
Datetime	"2026-09-18T14:30:00Z" (string)	timestamp
Binary	"base64:..." (string)	bytea
Boolean	true / false (boolean)	boolean
JSON	nested object or array, kept as structure	jsonb

Dialect differences

JSON is a file format and PostgreSQL is a database server, so the target has to be told the types the file never carried - the rows below are where the two sides diverge.

Property	in JSON	in PostgreSQL
port	—	5432
identifiers	Double quotes; backslash escapes	"double quotes"
row limit	—	LIMIT n
dates	No date type: dates arrive as strings and the reader must p...	timestamp, timestamptz, date, time
long text	—	TEXT
binary	Not supported natively - base64 inside a string	BYTEA
separator	Braces and commas	—
encoding	UTF-8 by definition	—
typing	string, number, boolean, null, object, array - no date type	—
shape	Nested objects and arrays	Tables of rows and columns
ceiling	Whole document is usually parsed into memory	—

Command line

Side	Command
PostgreSQL	pg_dump or COPY ... TO
PostgreSQL (load)	COPY ... FROM

JSON to PostgreSQL without the manual work

For batch jobs, large files and scheduling use the JSON to PostgreSQL converter — an offline desktop app for Windows, Linux and macOS. Free trial.