is that possible to receive all transactions from new block with light node and parse all and even internal transactions with the help of its api?
You can achieve this with Web3 API and what could you do here is first use:
This will return all the latest block data including transactions array with all the transaction hashes inside this block. Then you can loop the transaction hashes array and use:
This will return the transaction data including from, to, value and more.
As far as I know, you cannot. Some full node clients have functionality (i.e. the Parity Trace module) for parsing transaction message calls, though these are not even standardized in the ETH JSON-RPC protocol. Even with these modules, it is not simple to parse all internal transactions (assuming you mean ETH transfers) from a block.
Parsing internal transactions requires a live EVM to capture all message calls that occur as a result of a transaction. Light clients (in general, as I do not know which one you are using) are not actually processing transactions, but just receiving the required data and verifying that it exists in the blockchain.