Setting Up a Trust Line (Bob's Edition) | XRPL Development in JavaScript Level 1

Next, let’s set up a trust line so that Bob can also receive DOJ tokens.

Prerequisites

This guide proceeds with the following characters:

• Charlie (Token Issuer)
• Bob (Token Recipient)

Create the Script

The following is a script to set a trust line for Charlie’s tokens from Bob.

1. Modify the existing trust_set.js file in your project directory.

2. Add the function call of trust_set.js as follows:

   const xrpl = require('xrpl');
   
   // Function to send a TrustSet transaction
   async function trustSet(recipientSecret) {
       // Connect to the Testnet server
       const client = new xrpl.Client('wss://s.altnet.rippletest.net:51233');
       await client.connect();
   
       try {
           // Wallet address of the token issuer (Charlie)
           const issuerWalletAddress = 'charlie_wallet_address_here';
   
           // Set the recipient's wallet
           const recipientWallet = xrpl.Wallet.fromSecret(recipientSecret);
   
           // Fixed information about the token
           const currencyCode = 'DOJ'; // Currency code
           const amount = '10000'; // Maximum receivable amount of tokens
   
           // Send the TrustSet transaction
           const response = await client.submitAndWait(
               {
                   TransactionType: 'TrustSet', // Set the trust line
                   Account: recipientWallet.address, // Bob's address
                   LimitAmount: {
                       issuer: issuerWalletAddress, // Issuer's address (Charlie)
                       currency: currencyCode, // DOJ
                       value: amount, // 10000
                   },
               },
               { wallet: recipientWallet } // Sign with Bob's wallet
           );
   
           // Output the result to the console
           console.log('Transaction result:', response);
       } catch (error) {
           // Error handling
           console.error('An error occurred:', error);
       }
   
       // Disconnect from the server
       client.disconnect();
   }
   
   // Execute the function
   // const recipientSecret = 'alice_wallet_secret_here'; // Comment out
   const recipientSecret = 'bob_wallet_secret_here'; // Set Bob's wallet
   trustSet(recipientSecret);

   1. Enter Charlie’s testnet address in charlie_wallet_address_here.
   2. Enter Charlie’s testnet address in bob_wallet_secret_here.

Run the Script

1. Run the following command in the command line to execute the script.

   node trust_set.js

   If successful, the console will display the following.

   Transaction result: {
       id: 12,
       result: {
           Account: 'rDNVaJJSp9iQmHC8YAAwHytnLP9aXEPhDw', // Bob's address
           Fee: '12',
           Flags: 0,
           LastLedgerSequence: 475618,
           LimitAmount: {
               currency: 'DOJ', // Currency code
               issuer: 'rh8xETfGs1Ktizj9EXZb5QpW4aqk8bWUSU', // Issuer's address (Charlie)
               value: '10000' // Maximum receivable amount of tokens
           },
           Sequence: 473782,
           SigningPubKey: 'EDEE50D2E97DDB649EC43B36A0EF05AF0E9D33805CC11E7693A04D42E20B5E4C4C',
           TransactionType: 'TrustSet', // Transaction type
           TxnSignature: 'EC29F6806FE4A422AD5BF20610179F0791A908D4262D86C355966831217F0613956BF8D222E40018BC5C47BECDF0B77EB31426C5217276A4FE0F1884A53A890C',
           ctid: 'C00741D000010001',
           date: 768404650,
           hash: 'EADE8622DA5CC922CDBE52EDF7136D09C7F3C08CAC4C5BE4F07E946FE360893C', // Hash value
           inLedger: 475600,
           ledger_index: 475600, // Ledger index number
           meta: {
               AffectedNodes: [Array],
               TransactionIndex: 1,
               TransactionResult: 'tesSUCCESS' // Success
           },
           validated: true // Validated transaction
       },
       type: 'response'
   }

   Now Bob can also receive the DOJ tokens issued by Charlie.

   Using the payment_token.js created in the previous chapter, try sending tokens to Bob as well.