canisterSelf

Get the current canister's principal ID.

import { canisterSelf, IDL, query } from 'azle';

export default class {
    @query([], IDL.Principal)
    myId(): Principal {
        return canisterSelf();
    }

    @query([], IDL.Text)
    myIdText(): string {
        return canisterSelf().toText();
    }
}

The canisterSelf function returns the principal ID of the current canister. This is useful for self-reference in inter-canister calls and logging.

Returns: The current canister's principal (Principal)

Use Cases:

• Self-referencing in inter-canister calls
• Logging and debugging
• Building canister registries
• Identity verification

Important Notes:

• Always returns the same value for a given canister
• Available in all method types (@query, @update, etc.)
• Useful for building self-aware canister systems