The Tezos node provides a JSON/RPC interface. Note that it is an RPC,
and it is JSON based, but it does not follow the “JSON-RPC” protocol. It
is not active by default and it must be explicitly activated with the
--rpc-addr option. Typically, if you are not trying to run a local
network and just want to explore the RPC, you would run:
./tezos-node run --rpc-addr localhost
The RPC interface is self-documented and the
is able to pretty-print the RPC API. For instance, to see the API
provided by the Tezos Shell:
./tezos-client rpc list
To get API attached to the “genesis” block, including the remote procedures provided by the associated economic protocol version:
./tezos-client rpc list /chains/main/blocks/genesis
You might also want the JSON schema describing the expected input and output of a RPC. For instance:
./tezos-client rpc schema get /chains/main/blocks/genesis/hash
Note: you can get the same information, but as a raw JSON object, with a simple HTTP request:
curl -s localhost:8732/chains/main/blocks/head~10 wget -O - http://localhost:8732/describe?recurse=true wget -O - http://localhost:8732/describe/chains/main/blocks/genesis?recurse=true wget -O - http://localhost:8732/describe/chains/main/blocks/genesis/hash
An online index of RPC calls is also available.
The general call of an RPC from the client is
For instance, if you wish to request the current balance of a given
block and contract, you can call the associated RPC via the command :
$ tezos-admin-client rpc get
An RPC may take an input and generate an output both in JSON
format. For example, the previous RPC call, that does not require an
input, would display on the standard output :
"4000000000000" }. When calling a RPC that requires an input
through command-line, you will be prompted to provide the JSON input
in your default configured text editor. Alternatively, you can provide
the JSON input using command
$ tezos-admin-client rpc post <url> with <JSON>. Don’t forget to quote
the JSON according to your shell rules.
If you want to learn more about the exchange of RPCs between node and client you can pass the option -l and the client will print all the calls with their input/output.
A useful util to manipulate JSON is jq.