web3.isAddress (and other web3 methods such as toWei) works fine in the geth console, but when called from RPC (or IPC), it always returns

{"jsonrpc":"2.0","id":1,"error":{"code":-32601,"message":"The method is_address does not exist/is not available"}}

web3 is enabled by default, but still i explicitly used --rpcapi web3. This is confirmed by socat


i tried all possible combinations i can think of, such as web3_is_address. still no luck. any one can shed some light on this? Thanks.

  • how do you call it using rpc?
    – Badr Bellaj
    Jun 23, 2017 at 11:01
  • For example: curl -X POST --data '{"jsonrpc":"2.0","method":"web3_is_address","params":"0xafsdf","id":67}' http://localhost:8545
    – underst00d
    Jun 24, 2017 at 10:12

1 Answer 1


Acoording to the wiki, the isAddress function is not exposed over json rpc.

When using JS: You can make the call locally by installing the web3 node package (npm install web3) when using JS.

When not using JS: You can also take the regex from the web3 source and implement the function in your langauge of choice.

  • Thanks for the response. Yes, I read that wiki before. Some methods such personal.newAccount() are not listed in that wiki, but I can still call them from JSON RPC. That's why I thought util methods like isAddress() and toWei() should be available via JSON RPC as well. And yes, I can copy the regex but that would be my last resort.
    – underst00d
    Jun 24, 2017 at 10:09
  • Unfortunately I don't know about the possibility to call the function over json rpc.
    – nNickSize
    Jun 24, 2017 at 13:19

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