Jam.py (web framework)

Jam.py

Screenshot of Parameters, with the visual form editor being used to create an application
Original author(s)	Andrew Yushev
Initial release	July 1, 2015 (2015-07-01)
Stable release	7.0.56  / 18 May 2025 (18 May 2025)
Repository	https://github.com/jam-py-v5/
Written in	Python, JavaScript
Platform	Cross-platform
Type	Web framework
License	BSD 3-clause
Website	jampyapplicationbuilder.com

Jam.py is Web framework providing low-code and no-code, full stack rapid application development using Web Server Gateway Interface (WSGI), for the programming languages JavaScript and Python. It is free and open-source software released under a BSD 3-clause license.

Jam.py version 5.x is a single-page, event driven low-code development platform for database-driven business web applications, based on DRY principle, with emphasis on create, read, update and delete (CRUD). It is designed to automatically create JavaScript web forms from the underlying database tables, although a form can be created manually if required. The existing database tables can be imported into Jam.py to create the forms and reports. Database views are unsupported for import.

It provides a built-in web server, graphical user interface builder (named Application Builder), and database access including third-party databases.

Jam.py version 7.x supports routing within the single-page. Uniform resource locator (URL) mapping is unsupported.

Features

• v5.x is a single distribution which runs with Python 2.6+ and 3.x
• v7.x runs with Python >3.6, and is using dependencies installed automatically
• Can run as a standalone web development server or be used with any web server which supports WSGI
• Built-in GUI builder named Application Builder
• Support for JSON client data (for Representational State Transfer (REST) and JavaScript clients)
• Support for popular databases Oracle Database, Microsoft SQL Server, PostgreSQL, SQLite, MySQL, Firebird (database server), SQLCipher
• Extensible authentication mechanisms and role-based access control
• Internationalization support
• jQuery for Ajax and UI
• Template language
• Reports Templates based on LibreOffice
• Files upload and camera capturing
• Optimistic locking

Distinctive features

Built-in Application Builder

All development, maintenance and remote database administration can be performed via Builder interface. The most distinctive feature is the Client and Server Module. The Server Module enables the Python code for business logic, executed as a server-side session. The Client Module executes the JavaScript code within a browser. It is possible to exchange data between the two.

Application Builder is strongly influenced by Delphi visual designer.

Application Builder Client Module

This JavaScript "Hello, World!" program code displays a simple web page when visited:

task.create_menu($("#menu"), $("#content"), {
    splash_screen: '<h1 class="text-center">Hello World!</h1>',
    view_first: true
});

The above code resides in Task/Client Module(s) within the Application Builder. The task function can be accessed globally.

Application Builder Server Module

The Python libraries can be imported within the Task/Server Module(s):

import smtplib
def send_email():
    # code that sends email

The above code imports smtplib library, which might be used to send emails. The defined functions can be accessed globally.

Database migrations

Jam.py supports database migration and data import from one supported database to another. The below code in the Task/Server Module will import data from SQLite to application database:

from jam.db.db_modules import SQLITE
def on_created(task):
    task.copy_database(SQLITE, 'demo.sqlite')

Limitations:

• The SQLite database can not be imported into the application database which has foreign keys.

PythonAnywhere

PythonAnywhere Python 3.x deployment is supported

See also

• Flask (web framework)
• Pylons project
• Web2py
• Django (web framework)
• Comparison of web frameworks
• List of low-code development platforms

External links

• Official website
• Jam-py-v5 on GitHub