kerndb 0.1.2

A minimal, UI-first terminal database client

kerndb

A minimal, UI-first terminal database client. Connect, explore, and query your PostgreSQL database without leaving the terminal.

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Installation

Recommended — pipx (no venv needed)

pipx install kerndb

Alternative — pip

pip install kerndb

Verify

kerndb --version

Why pipx? pipx installs CLI tools in isolated environments automatically. You get the kerndb command globally without managing a virtual environment yourself. Install pipx with pip install pipx or brew install pipx.

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Quick Start

kerndb

That's it. The UI opens. Add a connection and start querying.

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What is kerndb?

kerndb is a terminal-based database client with a full interactive UI that runs inside your terminal. Built for developers who want the speed of the terminal without sacrificing the visual clarity of a GUI tool like TablePlus or DBeaver.

The terminal is not a limitation. It is a canvas.

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Using the TUI

Adding a connection

Launch kerndb and press N to add a new connection. Fill in your PostgreSQL details and press Save. Passwords are never stored on disk — kerndb reads them from environment variables:

# set password for a connection named "mydb"
# Windows
$env:KERNDB_PASSWORD_MYDB="yourpassword"

# Mac/Linux
export KERNDB_PASSWORD_MYDB=yourpassword

Or use a .env file in your project directory:

KERNDB_PASSWORD_MYDB=yourpassword

Running queries

• Click any table in the sidebar to preview its data
• Write SQL in the query editor and press F5 to run
• Select part of your SQL and press F5 to run just the selection
• Write multiple statements separated by ; and press F5 to run all

Keyboard shortcuts

Key	Action
F5	Run query (or selected text)
N	New connection (from picker screen)
D	Delete connection (press twice to confirm)
Ctrl+B	Go back to connection picker
Q	Quit
Ctrl+C	Force quit

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CLI Commands

For scripting and automation — bypasses the TUI entirely.

# list saved connections
kerndb cli connections

# run a query
kerndb cli query "SELECT * FROM users LIMIT 10" --connection mydb

# export to CSV
kerndb cli query "SELECT * FROM orders" --export orders.csv --connection mydb

# save a connection
kerndb cli save mydb --user postgres --database mydb

# remove a connection
kerndb cli remove mydb

# update kerndb
kerndb cli update

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Supported Databases

Database	Status
PostgreSQL 12+	✅ v1.0
MySQL 8+	🔜 v2.0
SQLite 3+	🔜 v2.0
MariaDB	🔜 planned
Supabase	🔜 planned
MongoDB	🔜 planned

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Configuration

Connections are stored at ~/.kerndb/config.json. Passwords are never stored — use environment variables or a .env file.

{
  "connections": {
    "mydb": {
      "type": "postgres",
      "host": "localhost",
      "port": 5432,
      "user": "postgres",
      "database": "mydb"
    }
  }
}

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Known Limitations

• Template strings in INSERT/UPDATE queries (e.g. INSERT INTO users VALUES ('{{name}}')) are not supported in v1.0. Planned for a future release.

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Development

git clone https://github.com/sayantanghosh-in/kerndb.git
cd kerndb
python -m venv venv
source venv/bin/activate   # windows: venv\Scripts\activate
pip install -r requirements.txt
pip install -e .
kerndb

Run tests:

python -m pytest tests/ -v

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Contributing

Issues and PRs are welcome at github.com/sayantanghosh-in/kerndb.

Please make sure your code passes flake8 src/ and black src/ before submitting a PR.

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License

MIT — see LICENSE for details.

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Built by Sayantan Ghosh