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contract Tenants{

  address admin;
  uint256[] public tenatIDs;
  mapping(bytes32 => Tenant) tenantDetails;

  function Tenants() public{

      admin = msg.sender;
  }

  struct Tenant{

      string uniqueID;
      string name;
      uint256 flatNum;
      uint256 phoneNum;
      uint256 advanceAmt;
      uint256 rent;
  }


  function addTenant(**Tenant tenantObj**) public{
          //code goes here
  }

}

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No, functions can only accept parameters of types known to the contract. You could create a JSON string in javascript and pass that, then somehow deconstruct it in your contract, but I suspect this would be very expensive to do. It would make a lost more sense to only pass the relevant data as independent variables.

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