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Ethereum: Json -RPC called – an error correction
As a developer of the Ethereum blockchain, you are probably no stranger to the complexity that goes hand in hand with the structure and maintenance of a robust and safe network. However, even the most experienced developers can encounter problems when integrating into external services.
I recently bumped into a problem in which my Ethereum-based application had problems with a JSON RPC call. In particular, the JSON_RPC_CALL method could not be executed as expected. In this article, I will lead you through the steps to diagnose and solve the problem.
The problem
First, let us find out what a JSON RPC call is. A JSON-RPC (JavaScript object surveying) is a standard path to interact with a blockchain network like Ethereum with JavaScript applications. With the JSON_RPC_CALL method, it enables you to operate a JSON object to the network and to carry out a specification or function.
In my case, I use the popular PHP library [PHP-etherscript] ( to interact with Ethereum. In particular, I call the ETH_CALLmethod from the class "EthereumContract" and transfer a JSON object as an argument.
The error
When I tried to carry out theJSON_RPC_CALL, I met an error message that stated that an error was displayed:
Error: json_rpc_call failed
`
At this point it was like an uncomplicated problem with my code or the Ethereum network. However, I had to have configured my blockchain and JSON RPC endpoint correctly.
Troubleshooting steps
To solve the problem, I followed the following steps:
- Check the blockchain status : Before I tried to interact with the blockchain, I found that it was in a fully charged state by checking for upcoming transactions or data updates.
- Check the PHP library documentation : The “PHP Etherscript” library contains detailed documentation for the use of JSON-RPC calls and other functions related from Ethereum. I checked this documentation to ensure that I used the right syntax and parameter.
- Check the error message
: After checking the error message, it was found that it is mentioned “failed” instead of displaying a certain cause of the problem. This led me to further examine and explore alternative solutions.
- ** Try to debug the PHP library and step through my code. By analyzing the call stack, I was able to identify a potential problem with the “ETH_CALL” method.
resolution
After taking these steps to remedy the error, I found that the problem was caused by a wrong parameter to the “Eth_Call "method. In particular, I handed over a false JSON object as an argument if I had actually expected a different format.
To fix this problem, I updated my code to correctly hand over the JSON object, which led to the successful execution of theJSON_RPC_CALL`.
Diploma
In summary, it can be frustrating to counter a mistake with a JSON RPC call on the Ethereum blockchain. By following these steps to remedy the error and careful review of your setup, you can solve problems and further build up robust and secure applications.
I hope this article was helpful in solving your problem or providing knowledge for future references. If you have any further questions or concerns, please do not hesitate to ask!
