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---
id: query-functions
title: Query Functions
ref: docs/framework/react/guides/query-functions.md
---
[//]: # 'Example'
```ts
injectQuery(() => ({ queryKey: ['todos'], queryFn: fetchAllTodos }))
injectQuery(() => ({ queryKey: ['todos', todoId], queryFn: () => fetchTodoById(todoId) })
injectQuery(() => ({
queryKey: ['todos', todoId],
queryFn: async () => {
const data = await fetchTodoById(todoId)
return data
},
}))
injectQuery(() => ({
queryKey: ['todos', todoId],
queryFn: ({ queryKey }) => fetchTodoById(queryKey[1]),
}))
```
[//]: # 'Example'
[//]: # 'Example2'
```ts
todos = injectQuery(() => ({
queryKey: ['todos', todoId()],
queryFn: async () => {
if (somethingGoesWrong) {
throw new Error('Oh no!')
}
if (somethingElseGoesWrong) {
return Promise.reject(new Error('Oh no!'))
}
return data
},
}))
```
[//]: # 'Example2'
[//]: # 'Example3'
```ts
todos = injectQuery(() => ({
queryKey: ['todos', todoId()],
queryFn: async () => {
const response = await fetch('/todos/' + todoId)
if (!response.ok) {
throw new Error('Network response was not ok')
}
return response.json()
},
}))
```
[//]: # 'Example3'
[//]: # 'Example4'
```ts
result = injectQuery(() => ({
queryKey: ['todos', { status: status(), page: page() }],
queryFn: fetchTodoList,
}))
// Access the key, status and page variables in your query function!
function fetchTodoList({ queryKey }) {
const [_key, { status, page }] = queryKey
return new Promise()
}
```
[//]: # 'Example4'
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