> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# AccessControl Role-Based Permissions

> Role-based access control using OpenZeppelin's AccessControl for fine-grained permission management.

# AccessControl Role-Based Permissions

Role-based access control using OpenZeppelin's AccessControl for fine-grained permission management.

Role-based access control using OpenZeppelin's AccessControl for fine-grained permission management.

## Explanation

AccessControl provides a flexible role system. Each role is a bytes32 identifier. The onlyRole modifier enforces that the caller has the required role. Roles can be granted and revoked by admins.

## Code

```solidity theme={null}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/access/AccessControl.sol";

contract RoleBasedContract is AccessControl {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE");

    constructor(address admin) {
        _grantRole(DEFAULT_ADMIN_ROLE, admin);
        _grantRole(MINTER_ROLE, admin);
    }

    function mint(address to, uint256 amount) external onlyRole(MINTER_ROLE) {
        // mint logic
    }

    function burn(address from, uint256 amount) external onlyRole(BURNER_ROLE) {
        // burn logic
    }
}
```

***

**Canonical knowledge ID:** `code-example:accesscontrol-role-based-permissions`