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Introduction

wtforms-jsonschema converts WTForms into JSON Schema compatibile representations

Requirements

  • Python 2.6 or later
  • Wtforms

Usage

To convert a form to a JSON Schema:

from wtforms_jsonschema.jsonschema import WTFormToJSONSchema
from wtforms.form import Form
from wtforms import fields

class MyForm(Form):
    name = fields.StringField()
    age = fields.IntegerField()
    description = fields.StringField()

schema_repr = WTFormToJSONSchema().convert_form(MyForm)
#{'type': 'object', 'properties': OrderedDict([('name', {'type': 'string', 'description': u'', 'title': u'Name'}), ('age', {'type': 'integer', 'description': u'', 'title': u'Age'}), ('description', {'type': 'string', 'description': u'', 'title': u'Description'})])}

All wtform's fields are supported including FormField and ListField. Circular references are currently unsupported.

TODO: To embed a JSON Schema as a form field:

from wtforms_jsonschema.forms import JSONSchemaField

#where schema is a python dictionay like schema_repr in the first exmaple

class MyForm(forms.Form):
    subfield = JSONSchemaField(schema=schema)

form = MyForm(data={'subfield':'<json encoded value>'})
form.validate() #will validate the subfield entry against schema
form['subfield'].as_widget() #will render a textarea widget with a data-schemajson attribute

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Generate json-schema from wtforms

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