---
id: update
title: 'Modify data: update()'
slug: /update
custom_edit_url: https://github.com/supabase/supabase/edit/master/spec/supabase_dart_v1_legacy.yml
---

import Tabs from '@theme/Tabs'
import TabItem from '@theme/TabItem'

Performs an UPDATE on the table.

```dart
final res = await supabase
  .from('cities')
  .update({ 'name': 'Middle Earth' })
  .match({ 'name': 'Auckland' })
  .execute();
```

## Notes

- `update()` should always be combined with [Filters](/docs/reference/dart/using-filters) to target the item(s) you wish to update.

## Examples

### Updating your data

```dart
final res = await supabase
  .from('cities')
  .update({ 'name': 'Middle Earth' })
  .match({ 'name': 'Auckland' })
  .execute();
```

### Updating JSON data

Postgres offers a
[number of operators](https://www.postgresql.org/docs/current/functions-json.html)
for working with JSON data. Right now it is only possible to update an entire JSON document,
but we are [working on ideas](https://github.com/PostgREST/postgrest/issues/465) for updating individual keys.

```dart
final res = await supabase
  .from('users')
  .update({
    'address': {
      'street': 'Melrose Place',
      'postcode': 90210
    }
  })
  .eq('address->postcode', 90210)
  .execute();
```