Mysten Labs TypeScript SDK Docs

How It Works

One Request at a Time

The wallet processes one signing request at a time. If a second request arrives while one is pending, it's immediately rejected with "A signing request is already pending."

dApps that send multiple transactions should serialize their signing calls — await each one before sending the next.

Request Types

Type	Triggered By	Data
`sign-transaction`	`sui:signTransaction`	Transaction JSON string
`sign-and-execute-transaction`	`sui:signAndExecuteTransaction`	Transaction JSON string
`sign-personal-message`	`sui:signPersonalMessage`	`Uint8Array` message bytes

Signing modal showing approval required with message details

Try It

Click the button to trigger a signing request, then open the wallet panel to approve or reject it:

Loading demo...

Programmatic Approval

You can approve or reject requests without the UI — useful for testing:

// Enqueue a request (returns a Promise)
const resultPromise = wallet.features['sui:signPersonalMessage'].signPersonalMessage({
	message: new TextEncoder().encode('Hello'),
	account: wallet.accounts[0],
});

// Check the pending request
console.log(wallet.pendingRequest);
// { id: '...', type: 'sign-personal-message', account: ..., data: Uint8Array }

// Approve it
await wallet.approveRequest();

// The promise resolves
const result = await resultPromise;
console.log(result.signature);

Rejecting a Request

wallet.rejectRequest('User declined');
// The promise rejects with Error('User declined')

Subscribing to Request Changes

const unsubscribe = wallet.onRequestChange((request) => {
	if (request) {
		console.log('New request:', request.type, request.id);
	} else {
		console.log('Request resolved');
	}
});

// Later: unsubscribe()

Connect Approval

Connect requests follow the same pattern: auto-connect if autoConnect: true, otherwise queue a connect request so the user can select which accounts to expose.

Connect dialog showing wallet picker with Dev Wallet option

// Subscribe to connect requests
wallet.onConnectChange((request) => {
	if (request) {
		// Show account picker
	}
});

// Approve with selected addresses
wallet.approveConnect(['0xabc...', '0xdef...']);

// Or reject
wallet.rejectConnect('User cancelled');

Transaction Analysis

The signing modal analyzes transaction commands and displays:

MoveCall — package, module, function, and arguments
TransferObjects — recipient address and objects being transferred
SplitCoins — coin type and split amounts
MergeCoins — coins being merged

Signing Flow