# Running the Server

Learn how to run and setup the JSON-RPC server on Evmos.

# Enable Server

To enable RPC server use the following flag (set to true by default).

Copy evmosd start --json-rpc.enable

# Defining Namespaces

Eth,Net and Web3 namespaces are enabled by default. In order to enable other namespaces use flag --json-rpc.api.

Copy evmosd 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:

Copy # set gas cap to 85M evmosd start --json-rpc.gas-cap 85000000000 # set gas cap to infinite (=0) evmosd 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

Copy ############################################################################### ### API Configuration ### ############################################################################### [api] # ... # EnableUnsafeCORS defines if CORS should be enabled (unsafe - use it at your own risk). enabled-unsafe-cors = true # default false