Hyperledger Fabric invokeChaincode returns Object object

Question

This is the queried function:

async query(stub, args) {
    let key = args[0]; //key
    let valueAsBytes = await stub.getState(key);
    let valString = valueAsBytes.toString('utf8');
    console.log('Value String: ', valString);
    return shim.success(valString);
}

The payload Buffer decodes to [Object object]

Answer 1

Replace 

return shim.success(valString);

with:

return shim.success(Buffer.from(valString));

It should work now

Answer 2

do Payload.toString() . it works for me