# chisel
[](https://pypi.org/project/chisel/)
[](https://pypi.org/project/chisel/)
[](https://github.com/craigahobbs/chisel/blob/main/LICENSE)
[](https://pypi.org/project/chisel/)
Chisel is a light-weight Python WSGI application framework built for creating well-documented,
schema-validated JSON web APIs.
## Links
- [API Documentation](https://craigahobbs.github.io/chisel/)
- [Source code](https://github.com/craigahobbs/chisel)
## JSON APIs
Chisel provides the [action](https://craigahobbs.github.io/chisel/action.html#chisel.action)
decorator for easily implementing schema-validated JSON APIs.
~~~ python
@chisel.action(spec='''
# Sum a list of numbers
action sum_numbers
urls
GET
query
# The list of numbers
float[len > 0] numbers
output
# The sum of the numbers
float sum
''')
def sum_numbers(ctx, req):
return {'sum': sum(req['numbers'])}
application = chisel.Application()
application.add_request(sum_numbers)
application.request('GET', '/sum_numbers', query_string='numbers.0=1&numbers.1=2&numbers.2=4')
('200 OK', [('Content-Type', 'application/json')], b'{"sum":7.0}')
~~~
Each action defines an ``action`` definition using
[Schema Markdown](https://craigahobbs.github.io/schema-markdown-js/language/).
The action callback is passed two arguments, a request
[Context](https://craigahobbs.github.io/chisel/app.html#chisel.Context)
and the schema-validated request input dictionary. The input request dictionary is created by
combining the request's URL path parameters, query string parameters, and input JSON content
parameters.
If there is a schema validation error the appropriate error code is automatically returned.
~~~ python
status, _, content_bytes = application.request('GET', '/sum_numbers')
'400 Bad Request'
b'{"error":"InvalidInput","message":"Required member \'numbers\' missing (query string)"}'
~~~
## API Documentation
You can add API documentation to your application by adding the Chisel documentation application
requests from
[create_doc_requests](https://craigahobbs.github.io/chisel/request.html#chisel.create_doc_requests).
~~~ python
application = chisel.Application()
application.add_requests(chisel.create_doc_requests())
~~~
By default the documentation application is hosted at "/doc/". An example of of Chisel's documentation output is
available [here](https://craigahobbs.github.io/chisel/example/#var.vName='chisel_doc_request').
## Development
This package is developed using [python-build](https://github.com/craigahobbs/python-build#readme).
It was started using [python-template](https://github.com/craigahobbs/python-template#readme) as follows:
~~~ sh
template-specialize python-template/template/ chisel/ -k package chisel -k name 'Craig A. Hobbs' -k email 'craigahobbs@gmail.com' -k github 'craigahobbs' -k nomain 1
~~~
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