90 lines
3.4 KiB
Markdown
90 lines
3.4 KiB
Markdown
---
|
|
title: JSON-RPC Server
|
|
sort_key: A
|
|
---
|
|
|
|
Geth supports all standard web3 JSON-RPC APIs. You can find documentation for
|
|
these APIs on the [Ethereum Wiki JSON-RPC page][web3-rpc].
|
|
|
|
JSON-RPC is provided on multiple transports. Geth supports JSON-RPC over HTTP,
|
|
WebSocket and Unix Domain Sockets. Transports must be enabled through
|
|
command-line flags.
|
|
|
|
Ethereum JSON-RPC APIs use a name-space system. RPC methods are grouped into
|
|
several categories depending on their purpose. All method names are composed of
|
|
the namespace, an underscore, and the actual method name within the namespace.
|
|
For example, the `eth_call` method resides in the `eth` namespace.
|
|
|
|
Access to RPC methods can be enabled on a per-namespace basis. Find
|
|
documentation for individual namespaces in the sidebar.
|
|
|
|
### HTTP Server
|
|
|
|
To enable the HTTP server, use the `--rpc` flag.
|
|
|
|
geth --rpc
|
|
|
|
By default, geth accepts connections from the loopback interface (127.0.0.1).
|
|
The default listening port is 8545. You can customize address and port using the
|
|
`--rpcport` and `--rpcaddr` flags.
|
|
|
|
geth --rpc --rpcport 3334
|
|
|
|
JSON-RPC method namespaces must be whitelisted in order to be available through
|
|
the HTTP server. An RPC error with error code `-32602` is generated if you call a
|
|
namespace that isn't whitelisted. The default whitelist allows access to the "eth"
|
|
and "shh" namespaces. To enable access to other APIs like account management ("personal")
|
|
and debugging ("debug"), they must be configured via the `--rpcapi` flag. We do
|
|
not recommend enabling such APIs over HTTP, however, since access to these
|
|
methods increases the attack surface.
|
|
|
|
geth --rpc --rpcapi personal,eth,net,web3b
|
|
|
|
Since the HTTP server is reachable from any local application, additional
|
|
protection is built into the server to prevent misuse of the API from web pages.
|
|
If you want enable access to the API from a web page, you must configure the
|
|
server to accept Cross-Origin requests with the `--rpccorsdomain` flag.
|
|
|
|
Example: if you want to use [Remix][remix] with geth, allow requests from the
|
|
remix domain.
|
|
|
|
geth --rpc --rpccorsdomain https://remix.ethereum.org
|
|
|
|
Use `--rpccorsdomain '*'` to enable access from any origin.
|
|
|
|
### WebSocket Server
|
|
|
|
Configuration of the WebSocket endpoint is similar to the HTTP transport. To
|
|
enable WebSocket access, use `--ws` flag. The default WebSocket port is 8546.
|
|
The `--wsaddr`, `--wsport` and `--wsapi` flags can be used to customize settings
|
|
for the WebSocket server.
|
|
|
|
geth --ws --wsport 3334 --wsapi eth,net,web3
|
|
|
|
Cross-Origin request protection also applies to the WebSocket server. Use the
|
|
`--wsorigins` flag to allow access to the server from web pages:
|
|
|
|
geth --ws --wsorigins http://myapp.example.com
|
|
|
|
As with `--rpccorsdomain`, using `--wsorigins '*'` allows access from any origin.
|
|
|
|
### IPC Server
|
|
|
|
JSON-RPC APIs are also provided on a UNIX domain socket. This server is enabled
|
|
by default and has access to all JSON-RPC namespaces.
|
|
|
|
The listening socket is placed into the data directory by default. On Linux and macOS,
|
|
the default location of the geth socket is
|
|
|
|
~/.ethereum/geth.ipc
|
|
|
|
On Windows, IPC is provided via named pipes. The default location of the geth pipe is:
|
|
|
|
\\.\pipe\geth.ipc
|
|
|
|
You can configure the location of the socket using the `--ipcpath` flag. IPC can
|
|
be disabled using the `--ipcdisable` flag.
|
|
|
|
[web3-rpc]: https://github.com/ethereum/wiki/wiki/JSON-RPC
|
|
[remix]: https://remix.ethereum.org
|