How to find the length of a string in solidity| Solidity by Example

This tutorial explains how to determine the string length in Solidity with examples. It checks the number of characters in a given string and returns the length of the string.

For instance, if the string is hello, the output is 5.

In Solidity, a string is a group of characters stored inside an array, and the data is stored in bytes.

Notably, there is no built-in length method for the string type.

#How to find string length in solidity

First, convert the string to bytes using the bytes(string) method.

The bytes.length returns a value of type uint.

uint is an alias for uint256.

Here are the steps to get the length

input string(string type)=> bytes(bytes) => length => uint:-

Here is a code for Find character count in string solidity.

 // SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

contract StringTest {
    function mine(string memory s) public pure returns ( uint256) {
        return bytes(s).length;
        }
}

Input:

{
  "string s": "hello"
}

Output:

{
  "0": "uint256: 5"
}