/react-moralis

Hooks and components to use Moralis in a React app

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react-moralis

React components and hooks for your Moralis project

This project is a thin React wrapper around Moralis, to easily call functionalities and display data.

Please check the official documentation of Moralis for all the functionalities of Moralis.

⚙️ Quick start

Make sure to have react, react-dom and moralis installed as dependencies, then install react-moralis

In short:

npm install react react-dom moralis react-moralis

or

yarn add react react-dom moralis react-moralis

Make sure to also moralis to the latest version, when you update react-moralis.

Then wrap your app in a <MoralisProvider>, and provide your appId and serverUrl:

import React from "react";
import ReactDOM from "react-dom";
import { MoralisProvider } from "react-moralis";

ReactDOM.render(
  <MoralisProvider appId="xxxxxxxx" serverUrl="xxxxxxxx">
    <App />
  </MoralisProvider>,
  document.getElementById("root"),
);

And call the hooks inside your app:

import React from "react";
import { useMoralis } from "react-moralis";

function App() {
  const { authenticate, isAuthenticated, user } = useMoralis();

  if (!isAuthenticated) {
    return (
      <div>
        <button onClick={() => authenticate()}>Authenticate</button>
      </div>
    );
  }

  return (
    <div>
      <h1>Welcome {user.get("username")}</h1>
    </div>
  );
}

🧭 Table of contents

🚀 Usage

Wrap your app in a MoralisProvider

In order to let your components have access to Moralis functions, wrap your app in a <MoralisProvider /> component. This will handle the whole initialization for you. You need to provide the appId and serverUrl, which can be obtained from your dashboard.

<MoralisProvider appId="xxxxxxxx" serverUrl="xxxxxxxx">
  <App />
</MoralisProvider>

This component will automatically initialize Moralis with the provided key and appId. It will also keep the authentication of the user automatically in sync and easy accessible (see useMoralis), and give access to all the other hooks.

Now you can use the hooks below in all App.tsx and all of its children:

  • useMoralis for authentication and user data
  • useMoralisQuery for easy query
  • useMoralisCloudFunction for easy cloud functions
  • useMoralisSubscription for easy subscription
  • useMoralisFile for easy file uploads

useMoralis()

Authenticate

The useMoralis hook provides all the basics functionalities that you need for authentication and user data.

You can use it inside a component and have access to various data and functions:

const { Moralis, isInitialized, ...rest } = useMoralis();

You will have access to the following values by using this hook:

Option Description
Moralis The global Moralis instance (same as the global Moralis object)
isInitialized A boolean, indicating if Moralis has been initialized
Option Description
authenticate() The authentication function, to authenticate via web3
logout() The logout function that will end the users session
signup() The signup function that will signup a new user with an username and password
signin() The signin function that will sign in a user with a username and password
auth Auth state object (see below)
authError Error object when authentication failed (auth.state will be "error");
isAuthenticated A boolean, indication if authenticated
isUnauthenticated A boolean, indication if user is authenticated
isAuthenticating A boolean, indication if user is authenticating (started but not finished)
hasAuthError A boolean, indication if authentication has an error
isLoggingOut A boolean, indication if the user is logging out (started but not finished)
isAuthUndefined A boolean, indication if the authentication is unknown, this is the initial state, before checking if the user is already logged in. It will resolve withing a few ms into isAuthenticated or isUnauthenticated
Option Description
setUserData() function to set userData and directly sync it in the app AND Moralis (see below)
user user object from Moralis.User.current, containing the state of the logged in user. It automatically will be (un)set automatically when logging in and out, or setting user data
enableWeb3 function to enable web3
web3 The web3 instance of Moralis.Web3;
isWeb3Enabled Boolean to indicate if web3 has been enabled via the enableWeb3 function

Authentication state

The authentication state, and the user object will be updated, when the user authenticates or logs out.

The auth object has the following format:

{
  state: "unauthenticated",
  error: null,
}

where state can be one of the following enums

enum AuthenticationState {
  UNDEFINED = "undefined",
  UNAUTHENTICATED = "unauthenticated",
  AUTHENTICATED = "authenticated",
  AUTHENTICATING = "authenticating",
  LOGGING_OUT = "logging_out",
  ERROR = "error",
}

authenticate() (web3)

You can call the authenticate() function to authenticate the user via web3, as long as a user has an active web3Provider (such as MetaMask).

This function calls the MoralisWeb3.authenticate() internally and will update the auth state and user state of your app automatically.

Example:

const User = () => {
  const { authenticate, isAuthenticated, user } = useMoralis();

  if (!isAuthenticated) {
    return (
      <div>
        <button onClick={() => authenticate()}>Authenticate</button>
      </div>
    );
  }

  return (
    <div>
      <h1>Hi {user.get("username")}</h1>
    </div>
  );
};

If you need direct feedback after authentication, you can provide an option object as argument to the authenticate call with onComplete, onError and/or onSuccess:

Example:

authenticate({ onComplete: () => alert("🎉") })

Elrond

If you want to authenticate via Elrond, you can provide the "erd" authentication type in the options type:

authenticate({ type: "erd" })

Walletconnect

If you want to use walletconnect, instead of metamask, you can add the provider option:

authenticate({ provider: "walletconnect" })

For some wallets you might want to specify the default chainId, to do so you can provide a chainId option:

authenticate({ provider: "walletconnect", chainId: 56 })

Custom signing message

To adjust the signing message, you can provide signingMessage as an option:

authenticate({ signingMessage: "Moralis Authentication" })

signup() (non-crypto)

To signup users without web3, and use a password/username, you can use the signup function.

Example:

const Signup = () => {
  const { signup, isAuthenticated, user } = useMoralis();

  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [email, setEmail] = useState("");

  return (
    <div>
      // [Your form and inputs somewhere here... ]
      <button onClick={() => signup(username, password, email)}>Sign up</button>
    </div>
  );
};

If you need to provide more data, than just the username, password and email, then you can provide an extra argument with an object, containing the data:

Example:

signup(username, password, email, { phone: "01234567" });

After calling this function the auth and user will automatically be updated to reflect the new state.

login() (non-crypto)

Similar to signup, you can also login via a hook function:

Example:

const Login = () => {
  const { login } = useMoralis();

  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
]
  return (
    <div>
      // [Your form and inputs somewhere here... ]
      <button onClick={() => login(username, password)}>Login</button>
    </div>
  );
};

After calling this function the auth and user will automatically be updated to reflect the new state.

logout()

Following the same principle as authentication/login, you can call logout and let the MoralisProvider handle the internal authentication state.

Example:

const LogoutButton = () => {
  const { logout, isAuthenticating } = useMoralis();

  return (
    <button onClick={() => logout()} disabled={isAuthenticating}>
      Authenticate
    </button>
  )
};

After calling this function the auth and user will automatically be updated to reflect the new state.

Update the user with setUserData()

When you want to set userData, you can use the setUserData() function from useMoralis. This accepts an object with key-value pairs of data that you want to set.

Upon calling this function:

  • The user is updated on Moralis
  • The user is updated in the React app

So this means that at the places where you use const {user} = useMoralis(), the user data will automatically be updated.

Example:

const { setUserData, userError, isUserUpdating, user } = useMoralis();

return (
  <div>
    {userError && <p>{userError.message}</p>}
    
    <pre>
      {JSON.stringify(user)}
    </pre>

    <button
      onClick={() => setUserData({
        username: "Batman",
        email: "batman@marvel.com",
        numberOfCats: 12,
      })}
      disabled={isUserUpdating}
    >
      Set user data
    </button>
  </div>
)

Refetch user data refetchUserData()

When your user data gets updated outside the app (via cloudfunctions or in another session for example), you might want to force a refetch of the user data. You can use refetchUserData for this.

Example:

const { refetchUserData, isUserUpdating, userError, user } = useMoralis();

return (
  <div>
    {userError && <p>{userError.message}</p>}
    
    <pre>
      {JSON.stringify(user)}
    </pre>

    <button onClick={() => refetchUserData()} disabled={isUserUpdating}>
      Refetch user data
    </button>
  </div>
)

useMoralisQuery()

Fetch Queries

The useMoralisQuery is heavily inspired by react-query. It handles all the async logic and manages the loading/error/data state internally and will automatically execute the query upon mounting in your component.

Example:

const { data, error, isLoading } = useMoralisQuery("GameScore");

This query will fetch "GameScore" for you when the component mounts.

The hook will return data, error and isLoading, which you can use to render the component.

Example:

const { data, error, isLoading } = useMoralisQuery("GameScore");

if (error) {
  return <span>🤯</span>;
}

if (isLoading) {
  return <span>🙄</span>;
}

return <pre>{JSON.stringify(data, null, 2)}</pre>;

Filter queries

You can filer the query via a second argument. You can mutate the query in any way that Moralis.Query can.

Example:

const { data, error, isLoading } = useMoralisQuery("GameScore", query =>
  query
    .greaterThanOrEqualTo("score", 100)
    .descending("score")
    .limit(limit),
);

This example will fetch the top 3 scores that are at least 100, in descending order.

You can also filter dynamically, but you need to provide a dependency array as third argument (similar to other hooks), to specify when this hook needs to update.

Example:

const [limit, setLimit] = useState(3);
const { data, error, isLoading } = useMoralisQuery(
  "GameScore",
  query =>
    query
      .greaterThanOrEqualTo("score", 100)
      .descending("score")
      .limit(limit),
  [limit],
);

Automatic updates with dependencies

This query will automatically refetch when the limit is changed.

If you want to disable the automatic fetching, you can also manually fetch. You need to provide autoFetch: false as option in the 4th argument. In that case it will ignore the dependencies and will only fetch if you manually call fetch()

Example:

const { fetch, data, error, isLoading } = useMoralisQuery(
  "GameScore",
  query =>
    query
      .greaterThanOrEqualTo("score", 100)
      .descending("score")
      .limit(limit),
  [],
  { autoFetch: false },
);

return <button onClick={() => fetch}>Fetch manually</button>;

Realtime / live queries

The useMoralisQuery hook can also be used to update upon realtime events. All you need to do is provide live: true. If any events update the query, then the data is automatically updated.

Example:

const [limit, setLimit] = useState(3);
const { data, error, isLoading } = useMoralisQuery(
  "GameScore",
  query =>
    query
      .greaterThanOrEqualTo("score", 100)
      .descending("score")
      .limit(limit),
  [limit],
  {
    live: true,
  },
);

By default we use these rules

Eventname Action
"create" Add to the data
"update" Update if object is already in data
"enter" Add to the data
"leave" Remove to the data
"delete" Remove to the data

You can override these rules with your own functions.

const [limit, setLimit] = useState(3);
const { data, error, isLoading } = useMoralisQuery(
  "GameScore",
  query =>
    query
      .greaterThanOrEqualTo("score", 100)
      .descending("score")
      .limit(limit),
  [limit],
  {
    live: true,
    onLiveEnter: (entity, all) => [...all, entity],
    onLiveCreate: (entity, all) => [...all, entity],
    onLiveDelete: (entity, all) => all.filter(e => e.id !== entity.id),
    onLiveLeave: (entity, all) => all.filter(e => e.id !== entity.id),
    onLiveUpdate: (entity, all) =>
      all.map(e => (e.id === entity.id ? entity : e)),
  },
);

useMoralisSubscription()

Listen for query events

This hook is used when you use useMoralisQuery with live: true. But if you want fine-grained control over subscriptions, and want to do actions upon the events, then you can use this hook.

It's as simple as calling this hook with the callbacks that you want. The first 3 arguments are the same as useMoralisQuery (queryName, filter, dependencies). In the last argument, you can specify the callbacks:

Eventname callback
"create" onCreate
"update" onUpdate
"enter" onEnter
"leave" onLeave
"delete" onDelete

They will all return the object as data.

For example if you want to notify when a new player was added:

Example:

useMoralisSubscription("GameScore", q => q, [], {
  onCreate: data => alert(`${data.attributes.playerName} was just created`),
});

This hook will handle the subscribing and unsubscribing automatically. It will automatically subscribe/unsubscribe when the component mounts/unmounts. All you have to do is use this hook.

You can disable the subscription by providing: enabled: false

Example:

useMoralisSubscription("GameScore", q => q, [], {
  onCreate: data => alert(`${data.attributes.playerName} was just created`),
  enabled: false,
});

useMoralisFile()

Get the data, and saveFunction with the useMoralisFile hook

const {
  error,
  isUploading,
  moralisFile,
  saveFile,
} = useMoralisFile();

Save to Moralis

All you need to do is call the save function with a valid file:

saveFile("batman.jpeg", file);

Then you can read the state from the provided variables error, isUploading and moralisFile,

Save to IPFS

saveFile("batman.jpeg", file, { saveIPFS: true });

Then you can get the ipfs data via moralisFile.ipfs and moralisFile.hash

Other options

Additionally you can also provide metadata, dags or specify the fileType in the options like:

Example:

const metadata = { createdById: "some-user-id" };
const tags = { groupId: "some-group-id" };

saveFile("batman.jpeg", file, {
  type: "image/jpeg",
  metadata,
  tags,
  saveIPFS: true,
});

useMoralisCloudFunction()

You can use the useMoralisCloudFunction hook to run cloud functions easily. All you need to do is provide a name for the function, and it will automatically fetch the data for you.

Example:

const { data, error, isLoading } = useMoralisCloudFunction("topScores");

If you have a function that requires parameters, then you can provide it as second argument:

Example:

const { data, error, isLoading } = useMoralisCloudFunction("topScores", {
  limit,
});

Trigger manually

If you rather want to trigger the fetching manually, you can provide autoFetch: false as option. And call the fetch function manually.

Example:

const { fetch, data, error, isLoading } = useMoralisCloudFunction(
  "topScores",
  {
    limit
  },
  { autoFetch: false }
);

<button onClick={() => fetch()}>Fetch manually<button>

useMoralisWeb3Api()

This hook will expose all the convenience functions of the Moralis.Web3API in the sdk (ex. Web3Api.native.getBlock or Web3Api.account.getNativeBalance). You can use this function in any way you want, for example:

const Web3Api = useMoralisWeb3Api()

const fetchBlock = async() => {
  const result = await Web3Api.native.getBlock({
    block_number_or_hash: '100000'
  })
  console.log(result)
}

Resolve data with useMoralisWeb3ApiCall()

You can also use a resolver, to resolve the asynchronous function. This works similar to useMoralisQuery or useMoralisCloudFunction. It will resolve the data/error for you and will re-trigger if dependencies change.

For this you can use useMoralisWeb3ApiCall():

  const [block, setBlock] = useState('100000');
  const Web3Api = useMoralisWeb3Api()

  const { fetch, data, error, isLoading } = useMoralisWeb3ApiCall(Web3Api.native.getBlock, {
    block_number_or_hash: block,
  });

  return (
    <div>
      <button onClick={() => fetch()}>Refetch</button>
      <pre>{JSON.stringify(data, null, 2)}</pre>
    </div>
  )

useNewMoralisObject()

This is a wrapper around the save method for a Moralis.Object. It creates a new object, and resolves the data, error and loading state, similar to the other hooks.

Example:

const AddScoreButton = ({user, score}) => {
  const { isSaving, error, save } = useNewMoralisObject('GameScore');

  return (<div>
    {error && <ErrorMessage error={error} />}
    <button onClick={() => save({score, user})} disabled={isSaving}>Save score</button>
  </div>)
}

Web3

In order to use (non enabled) web3 functionalities, you can just use:

const { web3 } = useMoralis()

Enable web3 via metamask

If you need features from an enabled web3 instance, then you need to enable web3 first. By default, metamask will be used to get a provider:

Example:

const EnableWeb3 = ({user, score}) => {
  const { web3, enableWeb3, isWeb3Enabled, isWeb3EnableLoading, web3EnableError } = useMoralis()

  if(isWeb3Enabled){
    return null
  }

  return <div>
    {web3EnableError && <ErrorMessage error={web3EnableError} />}
    <button onClick={() => enableWeb3()} disabled={isWeb3EnableLoading}>Enable web3</button>
  </div>
}

Enable web3 via Walletconnect

Optionally, you can specify to use walletconnect as a provider, to enable web3 via walletconnect:

Example:

const EnableWeb3 = ({user, score}) => {
  const { web3, enableWeb3, isWeb3Enabled, isWeb3EnableLoading, web3EnableError } = useMoralis()

  if(isWeb3Enabled){
    return null
  }

  return <div>
    {web3EnableError && <ErrorMessage error={web3EnableError} />}
    <button onClick={() => enableWeb3({provider: 'walletconnect'})} disabled={isWeb3EnableLoading}>Enable web3</button>
  </div>
}

Components

If you want to support Moralis, you can use the ByMoralis component, to render our logo 🙏:

Example:

const App = () => {
import { ByMoralis } from "react-moralis";

  return (
    <div>
      <ByMoralis width={300} />
      <ByMoralis width={300} variant="dark" />
      <ByMoralis width={300} variant="light" />
    </div>
  )
}

You can specify the color scheme; dark, light or colour(default), the width (defaults to 250px) and a custom styling via the style prop.

Handling responses

The easiest way to handle the responses of the different async methods (fetch, save etc.), is to read the data directly from the hook. The data will return error, data and isLoading/isFetching. These values can easily be used to (conditionally) render different parts of your app.

For other logic, you might want to listen directly for success/error responses. This is facilitated by passing one or more callback (onComplete, onError and/or onSuccess) to the fetch/save etc. functions:

Callback Description
onSuccess Fires when the request resolves successfully. If possible it is returned with the resolved data.
onError Fires when the request returns an error. It will return the corresponding error.
onComplete Fires when a request finishes (regardless of a success/error response)

Example:

const { fetch } = useMoralisQuery("GameScore");

const fetchAndNotify = () => {
  fetch({ 
    onSuccess: () => notifyUser(user.get("objectId")),
    onError: (error) => showErrorToast(error)
  });
};

😖 Error handling

For most hooks, we will resolve the error for you in an error variable. For example, the following function will not throw an error (initially or when you call fetch manually).

If you have a useCase where you do want to respond to an error directly you can provide throwOnError as an options parameter. For example:

const { data, error, isLoading, fetch } = useMoralisQuery("GameScore");

const fetchAndUseError = async () => {
  try {
    await fetch({ throwOnError: true });
  } catch (error) {
    alert("You got an error");
  }
};

⌨️ Typescript

This library offers first-class Typescript support.

🧑‍💻 Development

Make sure to have node and yarn installed.

  • Clone this repo
  •   cd react-moralis
  yarn install

Please follow the code guidelines before submitting a PR.

  • Make sure the code is clear and readable
  • Adhere to the style rules of Eslint, Prettier and Conventional Commit

Examples

To preview and work and see the examples;

  1. Make an .env file in /examples with the keys:

    # Your appId
REACT_APP_MORALIS_APP_ID="xxx"

# Your serverUrl
REACT_APP_MORALIS_SERVER_URL="xxx"

  2. Install and start the example app

    cd examples
yarn install
yarn start

Note: if you want to compile changes of react-moralis directly, run (in a second terminal)

  yarn build:watch