jsonrpcclient API


Client.request(method_name, *args, **kwargs)

Send a request, by passing the method and arguments. This is the main public method.

>>> client.request('cat', name='Mittens')
--> {"jsonrpc": "2.0", "method": "cat", "params": {"name": "Mittens"}, "id": 1}
<-- {"jsonrpc": "2.0", "result": "meow", "id": 1}
  • method_name – The remote procedure’s method name.
  • args – Positional arguments passed to the remote procedure.
  • kwargs – Keyword arguments passed to the remote procedure.

The payload (i.e. the result part of the response).

If you’re not interested in a response, use notify() instead of request().


Client.send(request, **kwargs)

Send a request, passing the whole JSON-RPC request object.

>>> client.send({'jsonrpc': '2.0', 'method': 'ping', 'id': 1})
--> {"jsonrpc": "2.0", "method": "ping", "id": 1}
<-- {"jsonrpc": "2.0", "result": "pong", "id": 1}
  • request (string or a JSON serializable object) – The JSON-RPC request.
  • kwargs – Clients can use these to configure an single request (separate to configuration of the whole session). For example, HTTPClient passes them on to requests.Session.send().

The payload (i.e. the result part of the response, or None in the case of a Notification).

Return type:

A JSON-decoded object.

  • ParseResponseError – The response was not valid JSON.
  • ValidationError – The response was valid JSON, but not valid JSON-RPC.
  • ReceivedErrorResponse – The server responded with a JSON-RPC error object.

Request class

from jsonrpcclient import Request
class request.Request(method, *args, **kwargs)

Create a JSON-RPC request object.

>>> Request('cat', name='Mittens')
{'jsonrpc': '2.0', 'method': 'cat', {'params': {'name': 'Mittens'}}, 'id': 1}
  • method – The method name.
  • args – Positional arguments added to params.
  • kwargs – Keyword arguments added to params. Use request_id=x to force the id to use.

The JSON-RPC request in dictionary form.

id_iterator = None


Send a Request object:

>>> client.send(Request('ping'))
--> {"jsonrpc": "2.0", "method": "ping", "id": 1}
<-- {"jsonrpc": "2.0", "result": "pong", "id": 1}

The request() method is a wrapper around send(Request()).

If you’re not interested in a response, use the Notification class instead of Request.

Batch requests

This JSON-RPC feature allows you to send multiple requests in a single message:

    {'jsonrpc': '2.0', 'method': 'cat', 'id': 1}, \
    {'jsonrpc': '2.0', 'method': 'dog', 'id': 2}])

Send multiple Request objects:

client.send([Request('cat'), Request('dog')])

Using list comprehension to get the cube of ten numbers:

client.send([Request('cube', i) for i in range(10)])

Unlike single requests, batch requests return the whole JSON-RPC response object - a list of responses for each request that had an id member.

The server may not support batch requests.


Some options can be configured in the config module. Import it and modify the attributes, for example:

from jsonrpcclient import config
config.validate = False
config.validate = True

Validate responses against the JSON-RPC schema. Disable to speed up processing.

config.ids = 'decimal'

Configure the id part of requests. Can be “decimal”, “hex”, “random” or “uuid”.

Configuring the Requests library

HTTPClient makes use of Kenneth Reitz’s Requests library. The Session is available so you can configure it before sending any requests.

For example, Basic Auth:

client.session.auth = ('user', 'pass')

SSL authentication:

client.session.verify = '/path/to/certificate'

Custom HTTP headers:

client.session.headers.update({'Content-Type': 'application/json-rpc'})

You can also configure some Requests options when calling send():

client.send(req, verify=True, cert='/path/to/certificate', \
    headers={'Content-Type': 'application/json-rpc'})

As in the Requests library, any dictionaries passed to send in named arguments will be merged with the session-level values that are set. The method-level parameters override session parameters.