Server Script

A Server Script lets you dynamically define a Python Script that is executed on the server on a document event or API

Introduced in Version 12

1. How to create a Server Script

To create a Server Script

  1. If your site is being hosted on, contact support to activate Server Script. In case of self-hosted accounts, set server_script_enabled as true in site_config.json of your site.
  2. To add/edit Server Script, ensure your role is System Manager.
  3. Create a new server script via "New Server Script" in the toolbar.
  4. Set the type of server script (Document Event / API).
  5. Set the document type and event name, or method name, script and save.

2. Features

2.1 Enabling Server Script

Server script must be enabled via site_config.json

bench --site site1.local set-config server_script_enabled true

2.2 Document Events

For scripts that are to be called via document events, you must set the Reference Document Type and Event Name to define the trigger

  • Before Insert
  • Before Save
  • After Save
  • Before Submit
  • After Submit
  • Before Cancel
  • After Cancel
  • Before Delete
  • After Delete
  • Before Save (Submitted Document)
  • After Save (Submitted Document)

2.3 API Scripts

You can create a new API that can be accessed via api/method/[methodname] by the script type "API"

If you want the guest user to access the API, you must check on "Allow Guest"

The response can be set via frappe.response["message"] object

2.3 Security

Frappe Framework uses the RestrictedPython library to restrict access to methods available for server scripts. Only the safe methods, listed below are available in server scripts

json # json module
dict # internal dict
_ # translator method
_dict # frappe._dict internal method
frappe.flags # global flags

frappe.format # frappe.format_value(value, dict(fieldtype='Currency'))
frappe.format_value # frappe.format_value(value, dict(fieldtype='Currency'))
frappe.date_format # default date format
frappe.format_date # returns date as "1st September 2019"

frappe.form_dict # form / request parameters
frappe.request # request object
frappe.response # response object
frappe.session.user # current user
frappe.session.csrf_token # CSRF token of the current session
frappe.user  # current user
frappe.get_fullname # fullname of the current user
frappe.get_gravatar # frappe.utils.get_gravatar_url
frappe.full_name = # fullname of the current user

frappe.get_meta # get metadata object

# DB

frappe.msgprint # msgprint
frappe.get_hooks # app hooks
frappe.utils # methods in frappe.utils
frappe.render_template # frappe.render_template,
frappe.get_url # frappe.utils.get_url
socketio_port # port for socketio
style.border_color # '#d1d8dd'
guess_mimetype = mimetypes.guess_type,
html2text = html2text,
dev_server # True if in developer mode

3. Examples

3.1 Change the value of a property before change

Script Type: Before Save

if "test" in doc.description:
    doc.status = 'Closed'

3.2 Custom validation

Script Type: "Before Save"

if "validate" in doc.description:
    raise frappe.ValidationError

3.3. Auto Create To Do

Script Type: "After Save"

if doc.allocted_to:
        doctype = 'ToDo'
        owner = doc.allocated_to,
        description = doc.subject

3.4 API

  • Script Type: API
  • Method Name: test_method
frappe.response['message'] = "hello"

Request: /api/method/test_method