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payloadcms/docs/access-control/fields.mdx
Said Akhrarov 5e4e27460e docs: fix links and formatting (#10346)
### What?
This PR fixes numerous links across the docs, both internal docs links
and external links. This PR also fixes some minor formatting issues in
some places, as well as optically aligns the markdown tables in tables
that had broken links.

### Why?
To properly link readers to the correct location in the docs, and for
better formatting and easier consumption.

### How?
Changes to many `.mdx` files in the `docs` folder.

Notes:
- There are duplicative section id's in `docs/authentication/email.mdx`,
I've fixed one such link, but have left it as is for now.
2025-01-03 21:41:33 -07:00

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---
title: Field-level Access Control
label: Fields
order: 40
desc: Field-level Access Control is specified within a field's config, and allows you to define which users can create, read or update Fields.
keywords: fields, access control, permissions, documentation, Content Management System, cms, headless, javascript, node, react, nextjs
---
Field Access Control is [Access Control](../access-control/overview) used to restrict access to specific [Fields](../fields/overview) within a Document.
To add Access Control to a Field, use the `access` property in your [Field Config](../fields/overview):
```ts
import type { Field } from 'payload';
export const FieldWithAccessControl: Field = {
// ...
access: { // highlight-line
// ...
},
}
```
<Banner type="warning">
**Note:**
Field Access Controls does not support returning [Query](../queries/overview) constraints like [Collection Access Control](./collections) does.
</Banner>
## Config Options
Access Control is specific to the operation of the request.
To add Access Control to a Field, use the `access` property in the [Field Config](../fields/overview):
```ts
import type { CollectionConfig } from 'payload';
export const Posts: CollectionConfig = {
slug: 'posts',
fields: [
{
name: 'title',
type: 'text',
// highlight-start
access: {
create: ({ req: { user } }) => { ... },
read: ({ req: { user } }) => { ... },
update: ({ req: { user } }) => { ... },
},
// highlight-end
};
],
};
```
The following options are available:
| Function | Purpose |
| ----------------------- | -------------------------------------------------------------------------------- |
| **`create`** | Allows or denies the ability to set a field's value when creating a new document. [More details](#create). |
| **`read`** | Allows or denies the ability to read a field's value. [More details](#read). |
| **`update`** | Allows or denies the ability to update a field's value [More details](#update). |
### Create
Returns a boolean which allows or denies the ability to set a field's value when creating a new document. If `false` is returned, any passed values will be discarded.
**Available argument properties:**
| Option | Description |
| ----------------- | -------------------------------------------------------------------------- |
| **`req`** | The [Request](https://developer.mozilla.org/en-US/docs/Web/API/Request) object containing the currently authenticated `user` |
| **`data`** | The full data passed to create the document. |
| **`siblingData`** | Immediately adjacent field data passed to create the document. |
### Read
Returns a boolean which allows or denies the ability to read a field's value. If `false`, the entire property is omitted from the resulting document.
**Available argument properties:**
| Option | Description |
| ----------------- | -------------------------------------------------------------------------- |
| **`req`** | The [Request](https://developer.mozilla.org/en-US/docs/Web/API/Request) object containing the currently authenticated `user` |
| **`id`** | `id` of the document being read |
| **`doc`** | The full document data. |
| **`siblingData`** | Immediately adjacent field data of the document being read. |
### Update
Returns a boolean which allows or denies the ability to update a field's value. If `false` is returned, any passed values will be discarded.
If `false` is returned and you attempt to update the field's value, the operation will **not** throw an error however the field will be omitted from the update operation and the value will remain unchanged.
**Available argument properties:**
| Option | Description |
| ----------------- | -------------------------------------------------------------------------- |
| **`req`** | The [Request](https://developer.mozilla.org/en-US/docs/Web/API/Request) object containing the currently authenticated `user` |
| **`id`** | `id` of the document being updated |
| **`data`** | The full data passed to update the document. |
| **`siblingData`** | Immediately adjacent field data passed to update the document with. |
| **`doc`** | The full document data, before the update is applied. |