Export data from PostgreSQL to JSON via command line on Linux

by

Posted on by

Want to export PostgreSQL data to JSON Lines (JSONL) file via Command Line Interface (CLI) on Linux (Ubuntu/RedHat/CentOS…)?

Using pg-cmd, Command Line Interface (CLI) client for PostgreSQL, you can unload PostgreSQL data to JSON easily and fast. Direct Interaction or Scripting and Automation.

  • No need to install PostgreSQL client library.
  • Convenient to deploy to cloud. No need to run installation file, just uncompress and run, immediately.
  • Commands are entered into a terminal or command prompt, accessed from local or remote (like SSH).
  • Support Windows, Linux, and MacOS.

Download pg-cmd Linux version Download pg-cmd

JSON Lines text format, also called newline-delimited JSON (NDJSON), or Line-delimited JSON (LDJSON). JSON Lines files may be saved with the file extension .jsonl, *.ndjson, *.ldjson.

Export PostgreSQL data to JSON via command line on Linux (Ubuntu/RedHat/CentOS…)

1. Unload Table.

1) In interactive mode:

pg-cmd> unload table=jobs datafile=e:\temp\tables\jobs.json filetype=json;

2) In batch mode:

pg-cmd dsn="pan:withdata@192.168.0.102/test" task=unload table=jobs datafile=e:\temp\tables\jobs.json filetype=json quit=y

2. Unload Query.

1) In interactive mode:

pg-cmd> unload query="select job_id,job_title from jobs"
     >  datafile=e:\temp\tables\jobs_part.json
     >  filetype=json;

2) In batch mode:

pg-cmd dsn="pan:withdata@192.168.0.102/test" task=unload query="select job_id,job_title from jobs" datafile=e:\temp\tables\jobs_part.json filetype=json quit=y

3. Unload All Tables.

1) In interactive mode:

pg-cmd> unload table=all folder=e:\temp\tables filetype=json;

2) In batch mode:

pg-cmd dsn="pan:withdata@192.168.0.102/test" task=unload table=all folder=e:\temp\tables filetype=json quit=y

See parameters detail.

More about pg-cmd – Command Line Interface (CLI) tool for PostgreSQL