Json To TransactionInstruction

example usage.ts

const data = await axios.post(
      'http://localhost:3001/api/dev/transactions/buySingleListing',
      {
        nftMint: 'E2Lo6nxNC6bGP1JZHTsce4ebVCn3cE6uDagbmhvUoit',
        wallet_address: 'BGQDmkQDrxZjNiUHCsSZYuKP4XJMfoJ6AXtmJh7CaxLH',
      },
    )
    const reconstructedInstructions = reconstructTransactionInstructions(
      data.data as JsonTransactionInstruction[],
    )
    const tx = new Transaction().add(...reconstructedInstructions)
    tx.feePayer = buyer
    await getConnection().sendTransaction(tx)
  

types.ts

export interface JsonAccountMeta {
  pubkey: string
  isSigner: boolean
  isWritable: boolean
}

export interface JsonTransactionInstruction {
  programId: string
  keys: JsonAccountMeta[]
  data: string
}

utility.ts

export const reconstructTransactionInstruction = (
  jsonInstruction: JsonTransactionInstruction,
): TransactionInstruction => {
  const programId = new PublicKey(jsonInstruction.programId)
  const data = Buffer.from(jsonInstruction.data, 'base64')
  const keys: AccountMeta[] = jsonInstruction.keys.map(key => ({
    pubkey: new PublicKey(key.pubkey),
    isSigner: key.isSigner,
    isWritable: key.isWritable,
  }))

  return new TransactionInstruction({
    programId,
    keys,
    data,
  })
}

// For handling multiple instructions
export const reconstructTransactionInstructions = (
  jsonInstructions: JsonTransactionInstruction[],
): TransactionInstruction[] => {
  return jsonInstructions.map(reconstructTransactionInstruction)
}