# blob

The `CandidType` object `blob` corresponds to the Candid type blob, is inferred to be a TypeScript `Uint8Array` and will be decoded into a JavaScript Uint8Array at runtime.

TypeScript or JavaScript:

    import { blob, Canister, query } from 'azle';

    export default Canister({
        getBlob: query([], blob, () => {
            return Uint8Array.from([68, 73, 68, 76, 0, 0]);
        }),
        printBlob: query([blob], blob, (blob) => {
            console.log(typeof blob);
            return blob;
        })
    });

Candid:

    service : () -> {
        getBlob : () -> (vec nat8) query;
        printBlob : (vec nat8) -> (vec nat8) query;
    }

dfx:

    dfx canister call candid_canister printBlob '(vec { 68; 73; 68; 76; 0; 0; })'
    (blob "DIDL\00\00")

    dfx canister call candid_canister printBlob '(blob "DIDL\00\00")'
    (blob "DIDL\00\00")