StdLib

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Provides serialization, encoding, and string manipulation utilities. StdLib methods are exposed through Syscalls.sol.

Methods

Method	Signature	Return	Safe	Description
serialize	serialize(bytes)	bytes	✅	Serialize a NeoVM stack item to bytes.
deserialize	deserialize(bytes)	bytes	✅	Deserialize bytes back to a stack item.
jsonSerialize	jsonSerialize(bytes)	bytes	✅	Serialize a stack item to JSON.
jsonDeserialize	jsonDeserialize(bytes)	bytes	✅	Deserialize JSON to a stack item.
base64Encode	base64Encode(bytes)	string	✅	Base64 encode.
base64Decode	base64Decode(string)	bytes	✅	Base64 decode.
base58Encode	base58Encode(bytes)	string	✅	Base58 encode.
base58Decode	base58Decode(string)	bytes	✅	Base58 decode.
itoa	itoa(int256,uint8)	string	✅	Integer to string (base 10 or 16).
atoi	atoi(string,uint8)	int256	✅	String to integer (base 10 or 16).
memoryCompare	memoryCompare(bytes,bytes)	int256	✅	Lexicographic byte comparison. Returns -1, 0, or 1.
memorySearch	memorySearch(bytes,bytes,int256,bool)	int256	✅	Search for a byte pattern. Returns index or -1.
stringSplit	stringSplit(string,string,bool)	string[]	✅	Split string by separator.
strLen	strLen(string)	uint256	✅	String length in text elements (not bytes).

Code Example

import "devpack/contracts/Syscalls.sol";

contract DataEncoder {
    function encodeForStorage(uint256 value) public view returns (bytes memory) {
        return Syscalls.serialize(abi.encode(value));
    }

    function toBase64(bytes memory data) public view returns (string memory) {
        return Syscalls.base64Encode(data);
    }

    function numberToHexString(int256 value) public view returns (string memory) {
        return Syscalls.itoa(value, 16);
    }

    function splitCsv(string memory csv) public view returns (string[] memory) {
        return Syscalls.stringSplit(csv, ",", true);
    }
}

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