Mastering Blockchain - Second Edition

Checking availability by calling any web3 method

var simplecontract = SimpleContract.at("0xd9d02a4974cbeb10406639ec9378a782bf7f4dd2"); 
console.log(simplecontract); 

This line of code simply uses console.log to print the simple contract attributes. Once this call is successful, it means that the web3 object has been created correctly and HttpProvider is available. Any other call can be used to verify the availability, but as a simple example, printing simple contract attributes been used in the preceding example.