laconicd/docs/api/json-rpc/running_server.md
2021-09-04 10:18:32 +00:00

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# Running the Server
Learn how to run and setup the JSON-RPC server on Ethermint. {synopsis}
## Enable Server
To enable RPC server use the following flag (set to true by default).
```bash
ethermintd start --json-rpc.enable
```
## Defining Namespaces
`Eth`,`Net` and `Web3` [namespaces](./namespaces) are enabled by default. In order to enable other namespaces use flag `--json-rpc.api`.
```bash
ethermintd start --json-rpc.api eth,txpool,personal,net,debug,web3,miner
```
## Set a Gas Cap
`eth_call` and `eth_estimateGas` define a global gas cap over rpc for DoS protection. You can override the default gas cap value of 25,000,000 by passing a custom value when starting the node:
```bash
# set gas cap to 85M
ethermintd start --json-rpc.gas-cap 85000000000
# set gas cap to infinite (=0)
ethermintd start --json-rpc.gas-cap 0
```
## CORS
If accessing the RPC from a browser, CORS will need to be enabled with the appropriate domain set. Otherwise, JavaScript calls are limit by the same-origin policy and requests will fail.
The CORS setting can be updated from the `app.toml`
```toml
###############################################################################
### API Configuration ###
###############################################################################
[api]
# ...
# EnableUnsafeCORS defines if CORS should be enabled (unsafe - use it at your own risk).
enabled-unsafe-cors = true # default false
```