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Connectivity

While troubleshooting network connectivity it is advisable to issue a rpc.get_info() request to rule out the possibility of Api object misconfiguration or authorization related problems. Given the JsonRpc object only requires a node URL, this approach isolates problems to simple node connectivity problems.

Below are a number of ways a rpc.get_info() request can fail and what they could potentially mean.

invalid json response body

(node:66636) UnhandledPromiseRejectionWarning: FetchError: invalid json response body at http://www.some-node-url.com/v1/chain/get_info reason: Unexpected token < in JSON at position 0

This typically means you have connected to a computer that is not running EOSIO software. For example, if you instantiate a JsonRpc object as follows:

const rpc = new JsonRpc('http://some-node-url.com', { fetch });

You would see the exception above when issuing a rpc.get_info() request since the computer at http://some-node-url.com is not running EOSIO software.

ETIMEDOUT

(node:68313) UnhandledPromiseRejectionWarning: FetchError: request to http://some-node-url.com:8000/v1/chain/get_info failed, reason: connect ETIMEDOUT 53.140.50.180:8000

This typically implies you have connected to a node that is running EOSIO software, but have entered the incorrect port, or left off the port number altogether.

Indefinite Hanging

If the rpc.get_info() request never returns, but also never throws an exception, it is likely that you've connected to a node running EOSIO software, but have misconfigured the protocol (http/https).

Only absolute URLs are supported

(node:72394) UnhandledPromiseRejectionWarning: TypeError: Only absolute URLs are supported

This typically implies you've entered an empty string as the first argument to JsonRpc as shown below.

const rpc = new JsonRpc('', { fetch });

Only HTTP(S) protocols are supported

(node:72612) UnhandledPromiseRejectionWarning: TypeError: Only HTTP(S) protocols are supported

This typically implies you've left off the protocol from the absolute URL string (i.e. 127.0.0.1:8888 rather than http://127.0.0.1:8888).

ENOTFOUND

(node:72822) UnhandledPromiseRejectionWarning: FetchError: request to http://www.some-node-url.com:8888/v1/chain/get_info failed, reason: getaddrinfo ENOTFOUND www.some-node-url.com

This typically implies you've misconfigured the domain name of the absolute URL in some way. Adding www. erroneously or removing .com at the end of the domain name could be possible mistakes.

f is not a function

(node:74052) UnhandledPromiseRejectionWarning: TypeError: f is not a function

This typically implies the absolute URL string of the node was not passed to the JsonRpc object as show below

const rpc = new JsonRpc({ fetch });