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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
// SPDX-License-Identifier: MIT // Source: // https://github.com/ensdomains/ens-contracts/blob/master/contracts/ethregistrar/StringUtils.sol pragma solidity >=0.8.4; library StringUtils { /** * @dev Returns the length of a given string * * @param s The string to measure the length of * @return The length of the input string */ function strlen(string memory s) internal pure returns (uint256) { uint256 len; uint256 i = 0; uint256 bytelength = bytes(s).length; for (len = 0; i < bytelength; len++) { bytes1 b = bytes(s)[i]; if (b < 0x80) { i += 1; } else if (b < 0xE0) { i += 2; } else if (b < 0xF0) { i += 3; } else if (b < 0xF8) { i += 4; } else if (b < 0xFC) { i += 5; } else { i += 6; } } return len; } }