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## Introducing Prettier for docs
Prettier [was originally disabled for our docs as it didn't support MDX
2.0](1fa636417f),
outputting invalid MDX syntax.
This has since been fixed - prettier now supports MDX 2.0.
## Reducing print width
This also reduces the print width for the docs folder from 100 to 70.
Our docs code field are very narrow - this should help make code more
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---
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title: Token Data
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label: Token Data
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order: 70
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desc: Storing data for read on the request object.
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keywords: authentication, config, configuration, documentation, Content Management System, cms, headless, javascript, node, react, nextjs
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---
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During the lifecycle of a request you will be able to access the data you have configured to be stored in the JWT by accessing `req.user`. The user object is automatically appended to the request for you.
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### Definining Token Data
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You can specify what data gets encoded to the Cookie/JWT-Token by setting `saveToJWT` property on fields within your auth collection.
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```ts
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import type { CollectionConfig } from 'payload'
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export const Users: CollectionConfig = {
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slug: 'users',
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auth: true,
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fields: [
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{
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// will be stored in the JWT
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saveToJWT: true,
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type: 'select',
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name: 'role',
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options: ['super-admin', 'user'],
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},
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{
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// the entire object will be stored in the JWT
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// tab fields can do the same thing!
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saveToJWT: true,
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type: 'group',
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name: 'group1',
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fields: [
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{
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type: 'text',
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name: 'includeField',
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},
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{
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// will be omitted from the JWT
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saveToJWT: false,
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type: 'text',
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name: 'omitField',
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},
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],
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},
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{
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type: 'group',
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name: 'group2',
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fields: [
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{
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// will be stored in the JWT
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// but stored at the top level
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saveToJWT: true,
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type: 'text',
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name: 'includeField',
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},
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{
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type: 'text',
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name: 'omitField',
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},
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],
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},
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],
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}
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```
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<Banner type="success">
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**Tip:**
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If you wish to use a different key other than the field `name`, you can define `saveToJWT` as a string.
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</Banner>
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### Using Token Data
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This is especially helpful when writing [Hooks](../hooks/overview) and [Access Control](../access-control/overview) that depend on user defined fields.
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```ts
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import type { CollectionConfig } from 'payload'
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export const Invoices: CollectionConfig = {
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slug: 'invoices',
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access: {
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read: ({ req, data }) => {
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if (!req?.user) return false
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// highlight-start
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if ({ req.user?.role === 'super-admin'}) {
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return true
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}
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// highlight-end
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return data.owner === req.user.id
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}
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}
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fields: [
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{
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name: 'owner',
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relationTo: 'users'
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},
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// ... other fields
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],
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}
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```
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