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This this the command line i have used to get geth running.
geth ipc --ipcapi "admin,db,eth,debug,miner,net,shh,txpool,personal,web3" --ipcpath "/root/.ethereum_experiment/geth.ipc"
so from node js how to connect to this geth client, before this i was doing rpc and connected using http providers but i want the connection over IPC not over RPC.
according to the documentation you can do:
$ geth attach ipc:/some/custom/path
$ geth attach http://191.168.1.1:8545
$ geth attach ws://191.168.1.1:8546
So the 1st line is what you want, just replace /some/custom/path with /root/.ethereum_experiment/geth.ipc
edit : just saw you want to do it on nodejs, I didn't test it but using the provider with ipc:/some/custom/path should be ok
Since you asked specifically about Node.js, see my answer to the similar question Getting contract balance over JSON RPC
TL;DR use the official web3 JavaScript library which handles connecting to the server over RPC and gives you easy access to query it for data.
See the question I linked for more details.
