Redux-Thunk
one minute of reading
Redux-Thunk is a library that allows you to perform asynchronous operations in a Redux-based application. It is one of the most popular Redux extensions that allows you to easily and clearly manage the state of your application.
Redux-Thunk is an add-on to the Redux library. Hosted as a separate package in NPM, it can be downloaded and set up as middleware when initializing Redux without complex configuration. It allows you to achieve asynchronous querying. Middleware in redux allows you to intercept a query and instead of making a single change on the stor it can make a series of queries, in the meantime they can query the API for external data. The whole thing is possible, obtainable without Redux-Thunk, but this one makes it much easier.
An example query in Redux-Thunk
The simplest example of using Redux-Thunk would be to query the API to log in a user. For the query to run correctly, a couple of things need to happen.
- Setting the application state that the login has started.
- Sending the query to the API
- Setting the user data in the store
- Possibly returning an error
export const authLogin = (email, password) => {
return dispatch => {
dispatch(authStart());
axios
.post(`${API_URL}/auth/api/v1/login/`, {
email: email,
password: password
})
.then(res => {
const token = res.data.token;
const user = res.data.user;
dispatch(authSuccess(token, user));
})
.catch(err => {
dispatch(authFail(err));
});
};
};
With this approach, we can isolate some of the logic of our application to a single function. We can use data mocking from the API and fully test the performance of such a Thunk.
Alternatives to Redux-thunk
An alternative to Redux-thunk is the Context API, which is built directly into the React library. We can easily create asynchronous queries there. We will only see a practical difference when the Context API supports a sizable object where we will frequently update parameters. We may find that the Context API is then less efficient and runs DOM updates too often.
Although Redux is a separate library it has rich documentation with well-described examples. Examples for Redux-Thunk are also numerous and it is definitely a productive solution for maintaining application state.
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