---
id: rpc
title: 'Postgres functions: rpc()'
slug: rpc
custom_edit_url: https://github.com/supabase/supabase/edit/master/spec/supabase_js_v1_legacy.yml
---

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

You can call Postgres functions as a "Remote Procedure Call".

That's a fancy way of saying that you can put some logic into your database then call it from anywhere.
It's especially useful when the logic rarely changes - like password resets and updates.

```sql
create or replace function hello_world() returns text as $$
  select 'Hello world';
$$ language sql;
```

```js
const { data, error } = await supabase.rpc('hello_world')
```

## Parameters

<ul className="method-list-group">
  
<li className="method-list-item">
  <h4 className="method-list-item-label">
    <span className="method-list-item-label-name">
      fn
    </span>
    <span className="method-list-item-label-badge required">
      required
    </span>
    <span className="method-list-item-validation">
      <code>string</code>
    </span>
  </h4>
  <div class="method-list-item-description">

The function name to call.

  </div>
  
</li>

<li className="method-list-item">
  <h4 className="method-list-item-label">
    <span className="method-list-item-label-name">
      params
    </span>
    <span className="method-list-item-label-badge false">
      optional
    </span>
    <span className="method-list-item-validation">
      <code>undefined</code> | <code>object</code>
    </span>
  </h4>
  <div class="method-list-item-description">

The parameters to pass to the function call.

  </div>
  
</li>

<li className="method-list-item">
  <h4 className="method-list-item-label">
    <span className="method-list-item-label-name">
      __namedParameters
    </span>
    <span className="method-list-item-label-badge required">
      required
    </span>
    <span className="method-list-item-validation">
      <code>object</code>
    </span>
  </h4>
  <div class="method-list-item-description">

No description provided.

  </div>
  
<ul className="method-list-group">
  <h5 class="method-list-title method-list-title-isChild expanded">Properties</h5>

<li className="method-list-item">
  <h4 className="method-list-item-label">
    <span className="method-list-item-label-name">
      head
    </span>
    <span className="method-list-item-label-badge required">
      required
    </span>
    <span className="method-list-item-validation">
      <code>boolean</code>
    </span>
  </h4>
  <div class="method-list-item-description">

When set to true, no data will be returned.

  </div>
  
</li>

<li className="method-list-item">
  <h4 className="method-list-item-label">
    <span className="method-list-item-label-name">
      count
    </span>
    <span className="method-list-item-label-badge required">
      required
    </span>
    <span className="method-list-item-validation">
      <code>null</code> | <code>exact</code> | <code>planned</code> | <code>estimated</code>
    </span>
  </h4>
  <div class="method-list-item-description">

Count algorithm to use to count rows in a table.

  </div>
  
</li>

</ul>

</li>

</ul>

## Examples

### Call a Postgres function

This is an example of invoking a Postgres function with no parameters.

```js
const { data, error } = await supabase.rpc('hello_world')
```

### With Parameters

```js
const { data, error } = await supabase.rpc('echo_city', { name: 'The Shire' })
```

### Bulk processing

You can process large payloads at once using [array parameters](https://postgrest.org/en/stable/api.html#calling-functions-with-array-parameters).

```js
const { data, error } = await postgrest.rpc('echo_cities', {
  names: ['The Shire', 'Mordor'],
})
```

### With filters

Postgres functions that return tables can also be combined with
[Modifiers](/docs/reference/javascript/using-modifiers) and
[Filters](/docs/reference/javascript/using-filters).

```js
const { data, error } = await supabase
  .rpc('echo_all_cities')
  .select('name, population')
  .eq('name', 'The Shire')
```

### With count option

You can specify a count option to get the row count along with your data.
Allowed values for count option are `null`, `exact`, `planned` and `estimated`.

```js
const { data, error, count } = await supabase.rpc(
  'hello_world',
  {},
  { count: 'exact' }
)
```
