Pending Action sits at the heart of createasyncthunk in Redux. This guide walks through the concept step by step, with examples, a cheatsheet, and common mistakes to avoid.
Pending Action Overview
At its core, pending action is about doing one thing well in Redux. Once you understand the pattern, you can apply it consistently across projects and teams.
Good pending action pays off across the whole project: fewer surprises, easier collaboration, and smoother onboarding. The snippet below is a solid starting point.
Start from a minimal Pending Action example and grow it only as needed.
Keep things explicit so Pending Action behaves the same for everyone on the team.
Name things clearly so teammates understand your Pending Action at a glance.
Verify Pending Action works as expected before relying on it in important work.
Redux Cheatsheet
Quick Redux Toolkit reference related to pending action.
Concept
Example
Purpose
Store
configureStore({ reducer })
Hold app state
Slice
createSlice({ name, reducers })
State + actions together
Read state
useSelector((s) => s.x)
Get data in components
Dispatch
useDispatch()
Send actions
Async
createAsyncThunk(...)
Handle side effects
Data fetching
createApi(...)
RTK Query endpoints
Derived data
createSelector(...)
Memoized computations
How Pending Action Works in Redux
Pending Action follows Redux's predictable data flow: components dispatch actions, reducers compute the next state from the previous state and the action, and subscribed components re-render.
createSlice generates actions and a reducer together; Immer lets you write safe 'mutating' updates.
State lives in a single, read-only store.
Actions are the only way to describe a change.
Reducers are pure functions that return the next state.
Redux Toolkit removes most boilerplate with slices and thunks.
Practical Guidance for Pending Action
In modern apps, pending action should use Redux Toolkit rather than hand-written Redux. Keep state minimal, colocate logic in slices, and use RTK Query for server data.
Concern
Recommendation
Boilerplate
Use Redux Toolkit (createSlice)
Server data
Prefer RTK Query over manual thunks
Performance
Memoize selectors with createSelector
Types
Use typed useAppSelector/useAppDispatch hooks
Common Mistakes
Skipping edge cases and error handling when using pending action.
Not verifying the result of pending action before moving on.
Over-complicating pending action before you actually need the extra flexibility.
Ignoring documentation, which makes pending action hard for the next person to follow.
Key Takeaways
Pending Action is a core part of working effectively with Redux.
Start small and keep pending action focused on a single goal.
Apply consistent patterns so pending action scales across your project.
Practise and document pending action to keep your workflow maintainable.
Pro Tip
Bookmark this pending action pattern and reuse it. Consistency across your Redux work is worth more than clever one-off solutions.
You now understand pending action in Redux and how to apply it in real projects. Next, continue with Fulfilled Action to keep building your skills.