Uppercase Memos

const tx = { TransactionType : 'Payment', Destination: 'rncjeoo4xeqKtrrqVHsxQjrV6CyZ93Wkvm', Amount: String(10000), Memos: [ { Memo: { MemoData: Buffer.from('Hi there! How are things?', 'utf8').toString('hex') } }, { Memo: { MemoData: Buffer.from('Anything else?', 'utf8').toString('hex'), MemoType: Buffer.from('something 123', 'utf8').toString('hex'), MemoFormat: Buffer.from('some/mimetype', 'utf8').toString('hex') } } ] } if (typeof tx.Memos !== 'undefined' && Array.isArray(tx.Memos)) { tx.Memos = tx.Memos .filter(m => typeof m.Memo === 'object' && m.Memo !== null) .map(m => { return { Memo: Object.keys(m.Memo).reduce((a, b) => { if (typeof m.Memo[b] === 'string') { Object.assign(a, { [b]: m.Memo[b].toUpperCase() }) } return a }, {}) } }) } console.log(tx.Memos)