# createTransaction

# Function: createTransaction()

```ts
function createTransaction<T>(config): Transaction<T>;
```

Defined in: [packages/db/src/transactions.ts:156](https://github.com/TanStack/db/blob/main/packages/db/src/transactions.ts#L156)

Creates a new transaction for grouping multiple collection operations

## Type Parameters

### T

`T` *extends* `object` = `Record`\<`string`, `unknown`\>

## Parameters

### config

[`TransactionConfig`](../interfaces/TransactionConfig.md)\<`T`\>

Transaction configuration with mutation function

## Returns

[`Transaction`](../interfaces/Transaction.md)\<`T`\>

A new Transaction instance

## Examples

```ts
// Basic transaction usage
const tx = createTransaction({
  mutationFn: async ({ transaction }) => {
    // Send all mutations to API
    await api.saveChanges(transaction.mutations)
  }
})

tx.mutate(() => {
  collection.insert({ id: "1", text: "Buy milk" })
  collection.update("2", draft => { draft.completed = true })
})

await tx.isPersisted.promise
```

```ts
// Handle transaction errors
try {
  const tx = createTransaction({
    mutationFn: async () => { throw new Error("API failed") }
  })

  tx.mutate(() => {
    collection.insert({ id: "1", text: "New item" })
  })

  await tx.isPersisted.promise
} catch (error) {
  console.log('Transaction failed:', error)
}
```

```ts
// Manual commit control
const tx = createTransaction({
  autoCommit: false,
  mutationFn: async () => {
    // API call
  }
})

tx.mutate(() => {
  collection.insert({ id: "1", text: "Item" })
})

// Commit later
await tx.commit()
```