Signing

Sign transactions, authorization entries, and arbitrary messages using the user's Freighter wallet.

Signing a Transaction

signTransaction()

Pass a transaction XDR string to Freighter for the user to review and sign.

signTransaction(xdr: string, opts?: {
  network?: string,
  networkPassphrase?: string,
  address?: string
}) -> Promise<{ signedTxXdr: string; signerAddress: string } & { error?: FreighterApiError }>

The user will review the transaction details before signing.

Parameters

Parameter	Type	Description
xdr	string	Required. Base64-encoded transaction XDR.
opts.network	string	Network name (maps to Networks enum in @stellar/stellar-sdk).
opts.networkPassphrase	string	Custom passphrase. Ignored if network is also provided.
opts.address	string	Request a specific account's signature. Freighter will switch to that account if available.

Passing network or networkPassphrase lets Freighter warn the user if their wallet is configured to the wrong network.

Example

import { signTransaction } from "@stellar/freighter-api";

const { signedTxXdr, signerAddress, error } = await signTransaction(xdr, {
  network: "TESTNET",
  address: "G...", // optional: request a specific account
});

if (error) {
  console.error("Signing failed:", error.message);
} else {
  console.log("Signed by:", signerAddress);
  console.log("Signed XDR:", signedTxXdr);
}

Errors

Condition	Error message
User rejected	"The user rejected this request."
Extension not installed	"The wallet encountered an internal error"

Signing an Auth Entry

signAuthEntry()

Sign an authorization entry preimage and receive the signed hash back as a base64 string. Used for Soroban contract authorization flows.

signAuthEntry(entryXdr: string, opts: {
  address: string
}) -> Promise<{ signedAuthEntry: string | null; signerAddress: string } & { error?: FreighterApiError }>

See the authorizeEntry helper in js-stellar-base for how signed auth entries are used, or the Soroban development documentation for wallet-side patterns.

Example

import { signAuthEntry } from "@stellar/freighter-api";

const { signedAuthEntry, signerAddress, error } = await signAuthEntry(entryXdr, {
  address: "G...",
});

if (error) {
  console.error("Auth entry signing failed:", error.message);
} else {
  console.log("Signed auth entry:", signedAuthEntry);
}

Errors

Condition	Error message
User rejected	"The user rejected this request."

Signing a Message

signMessage()

Sign an arbitrary string and receive a base64-encoded Ed25519 signature. Follows SEP-53.

signMessage(message: string, opts: {
  address: string
}) -> Promise<{ signedMessage: string | null; signerAddress: string } & { error?: FreighterApiError }>

Example

import { signMessage } from "@stellar/freighter-api";

const { signedMessage, signerAddress, error } = await signMessage(
  "Verify account ownership",
  { address: "G..." },
);

if (error) {
  console.error("Message signing failed:", error.message);
} else {
  console.log("Signature:", signedMessage);
}

Errors

Condition	Error message
User rejected	"The user rejected this request."

Full Example: Connect, Sign, and Submit

A complete flow from connection to Horizon submission:

import { isConnected, requestAccess, signTransaction } from "@stellar/freighter-api";
import { Server, TransactionBuilder } from "@stellar/stellar-sdk";

// 1. Check Freighter is installed
const connectResult = await isConnected();
if (!connectResult.isConnected) {
  throw new Error("Freighter not found");
}

// 2. Request the user's public key
const accessResult = await requestAccess();
if (accessResult.error) {
  throw new Error(accessResult.error.message);
}

// 3. Sign the transaction
const xdr = "AAAAAgAAAAA..."; // your assembled transaction XDR
const signResult = await signTransaction(xdr, {
  network: "TESTNET",
  address: accessResult.address,
});
if (signResult.error) {
  throw new Error(signResult.error.message);
}

// 4. Submit to Horizon
const server = new Server("https://horizon-testnet.stellar.org");
const tx = TransactionBuilder.fromXDR(
  signResult.signedTxXdr,
  "Test SDF Network ; September 2015",
);
const response = await server.submitTransaction(tx);
console.log("Transaction submitted:", response.hash);