# Cancel or end an auction

### Prerequisites

Before getting started, make sure you have the following ready:

1. [Create a Ternoa](/getting-started/wallets/ternoa-wallet.md) account with [Alphanet CAPS](broken://pages/ej9gceaLIhCN2PgUBh42)
2. Install and set up your editor of choice (we will use Visual Studio Code \[VSC] in this tutorial)
3. Install [NodeJS v.14+](https://nodejs.org/en/download/) & NPM
4. [Install & initialize Ternoa-JS](/build-1/javascript/ternoa-js-library-utilities/installation-and-initialization.md)

### Cancel an auction on a marketplace using Ternoa-JS

This function cancels an auctioned NFT from a marketplace on the Ternoa chain. It returns an object promise containing the AuctionCancelledEvent provided by the Ternoa blockchain.

{% hint style="info" %}
Use your own account by updating the `//TernoaTestAccount` with your account seed when retrieving the keyring from the example below. **Replace the NFT\_ID** with the existing one to cancel. Note: **This transaction can only be submitted if the auction has not started yet.** 
{% endhint %}

```typescript
import {
    cancelAuction,
    initializeApi,
    getKeyringFromSeed,
    WaitUntil,
} from "ternoa-js";

const cancelAuctionNFT = async () => {
    try {
        await initializeApi();
        const keyring = await getKeyringFromSeed("//TernoaTestAccount");
        const NFT_ID = // update with the auctioned nft id you want to cancel.
        const res = await cancelAuction(
            NFT_ID,
            keyring,
            WaitUntil.BlockInclusion
        );
        console.log(`Auction cancelled for NFT id: ${res.nftId}`);
    } catch (e) {
        console.error(e);
    }
};
```

#### The expected params

```markdown
`nftId`: The ID of the auctioned NFT to cancel.
`keyring`: The provided keyring (containing the address) will be used to sign the transaction and pay the execution fee.
`waitUntil`: WaitUntil defines at which point we want to get the results of the transaction execution: BlockInclusion or BlockFinalization.
```

#### Response

The response provided from the blockchain event includes all the information below according to the parameters provided when canceling an auction.

```markdown
`nftId`: NFT id of the canceled auction.
```

### End an auction on a marketplace using Ternoa-JS

This function ends an auctioned NFT from a marketplace on the Ternoa chain. It returns an object promise containing the AuctionCompletedEvent provided by the Ternoa blockchain.

{% hint style="info" %}
Use your own account by updating the `//TernoaTestAccount` with your account seed when retrieving the keyring from the example below. **Replace the NFT\_ID** with the existing one to end. Note: **This transaction can only be submitted if the auction has entered the ending period.**
{% endhint %}

```typescript
import {
    endAuction,
    initializeApi,
    getKeyringFromSeed,
    WaitUntil,
} from "ternoa-js";

const endAuctionNFT = async () => {
    try {
        await initializeApi();
        const keyring = await getKeyringFromSeed("//TernoaTestAccount");
        const NFT_ID = // update with the auctioned nft id you want to end.
        const res = await endAuction(
            NFT_ID,
            keyring,
            WaitUntil.BlockInclusion
        );
        console.log(`Auction ended for NFT id: ${res.nftId}`);
    } catch (e) {
        console.error(e);
    }
};
```

#### The expected params

```markdown
`nftId`: The ID of the auctioned NFT to end.
`keyring`: The provided keyring (containing the address) will be used to sign the transaction and pay the execution fee.
`waitUntil`: WaitUntil defines at which point we want to get the results of the transaction execution: BlockInclusion or BlockFinalization.
```

#### Response

The response provided from the blockchain event includes all the information below according to the parameters provided when ending an auction.

```markdown
`nftId`: NFT id auctioned.
`newOwner`: The new NFT owner.
`amount`: The NFT price as a string corresponding to the value in a big number.
`amountRounded`: The NFT price as a number.
`marketplaceCut`: The marketplace commission fee on the auctioned NFT as a string corresponding to the value in a big number.
`marketplaceCutRounded`: The marketplace commission fee on the auctioned NFT as a number.
`royaltyCut`: The NFT creator royalty fee on the auctioned NFT as a string corresponding to the value in a big number.
`royaltyCutRounded`: The NFT creator royalty fee on the auctioned NFT as a number.
```

### Support

If you face any trouble, feel free to reach out to our community engineers in our [Discord](https://discord.gg/fUmBkPpnRu).


---

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