# RPC

Tendermint supports the following RPC protocols:

* URI over HTTP
* JSONRPC over HTTP
* JSONRPC over websockets

Tendermint RPC is build using [our own RPC library](https://github.com/tendermint/tendermint/tree/master/rpc/lib). Documentation and tests for that library could be found at `tendermint/rpc/lib` directory.

### Configuration

Set the `laddr` config parameter under `[rpc]` table in the $TMHOME/config.toml file or the `--rpc.laddr` command-line flag to the desired protocol://host:port setting.  Default: `tcp://0.0.0.0:46657`.

### Arguments

Arguments which expect strings or byte arrays may be passed as quoted strings, like `"abc"` or as `0x`-prefixed strings, like `0x616263`.

### URI/HTTP

Example request:
```bash
curl -s 'http://localhost:46657/broadcast_tx_sync?tx="abc"' | jq .
```

Response:
```json
{
  "error": "",
  "result": {
    "hash": "2B8EC32BA2579B3B8606E42C06DE2F7AFA2556EF",
    "log": "",
    "data": "",
    "code": 0
  },
  "id": "",
  "jsonrpc": "2.0"
}
```

The first entry in the result-array (`96`) is the method this response correlates with. `96` refers to "ResultTypeBroadcastTx", see [responses.go](https://github.com/tendermint/tendermint/blob/master/rpc/core/types/responses.go) for a complete overview.

### JSONRPC/HTTP

JSONRPC requests can be POST'd to the root RPC endpoint via HTTP (e.g. `http://localhost:46657/`).

Example request:
```json
{
  "method": "broadcast_tx_sync",
  "jsonrpc": "2.0",
  "params": [ "abc" ],
  "id": "dontcare"
}
```

### JSONRPC/websockets

JSONRPC requests can be made via websocket.  The websocket endpoint is at `/websocket`, e.g. `http://localhost:46657/websocket`.  Asynchronous RPC functions like event `subscribe` and `unsubscribe` are only available via websockets.

### Endpoints

An HTTP Get request to the root RPC endpoint (e.g. `http://localhost:46657`) shows a list of available endpoints.

```
Available endpoints:
http://localhost:46657/abci_info
http://localhost:46657/dump_consensus_state
http://localhost:46657/genesis
http://localhost:46657/net_info
http://localhost:46657/num_unconfirmed_txs
http://localhost:46657/status
http://localhost:46657/unconfirmed_txs
http://localhost:46657/unsafe_flush_mempool
http://localhost:46657/unsafe_stop_cpu_profiler
http://localhost:46657/validators

Endpoints that require arguments:
http://localhost:46657/abci_query?path=_&data=_&prove=_
http://localhost:46657/block?height=_
http://localhost:46657/blockchain?minHeight=_&maxHeight=_
http://localhost:46657/broadcast_tx_async?tx=_
http://localhost:46657/broadcast_tx_commit?tx=_
http://localhost:46657/broadcast_tx_sync?tx=_
http://localhost:46657/commit?height=_
http://localhost:46657/dial_seeds?seeds=_
http://localhost:46657/subscribe?event=_
http://localhost:46657/tx?hash=_&prove=_
http://localhost:46657/unsafe_start_cpu_profiler?filename=_
http://localhost:46657/unsafe_write_heap_profile?filename=_
http://localhost:46657/unsubscribe?event=_
```

### tx

Returns a transaction matching the given transaction hash.

**Parameters**

1. hash - the transaction hash
2. prove - include a proof of the transaction inclusion in the block in the result (optional, default: false)

**Returns**

- `proof`: the `types.TxProof` object
- `tx`: `[]byte` - the transaction
- `tx_result`: the `abci.Result` object
- `index`: `int` - index of the transaction
- `height`: `int` - height of the block where this transaction was in

**Example**

```bash
curl -s 'http://localhost:46657/broadcast_tx_commit?tx="abc"' | jq .
# {
#   "error": "",
#   "result": {
#     "hash": "2B8EC32BA2579B3B8606E42C06DE2F7AFA2556EF",
#     "log": "",
#     "data": "",
#     "code": 0
#   },
#   "id": "",
#   "jsonrpc": "2.0"
# }

curl -s 'http://localhost:46657/tx?hash=0x2B8EC32BA2579B3B8606E42C06DE2F7AFA2556EF' | jq .
# {
#   "error": "",
#   "result": {
#     "proof": {
#       "Proof": {
#         "aunts": []
#       },
#       "Data": "YWJjZA==",
#       "RootHash": "2B8EC32BA2579B3B8606E42C06DE2F7AFA2556EF",
#       "Total": 1,
#       "Index": 0
#     },
#     "tx": "YWJjZA==",
#     "tx_result": {
#       "log": "",
#       "data": "",
#       "code": 0
#     },
#     "index": 0,
#     "height": 52
#   },
#   "id": "",
#   "jsonrpc": "2.0"
# }
```

### More Examples

See the various bash tests using curl in `test/`, and examples using the `Go` API in `rpc/client/`.