diff --git a/app/scripts/lib/decrypt-message-manager.js b/app/scripts/lib/decrypt-message-manager.js
index 24b8e8dd7..cf67ee03e 100644
--- a/app/scripts/lib/decrypt-message-manager.js
+++ b/app/scripts/lib/decrypt-message-manager.js
@@ -3,6 +3,7 @@ import ObservableStore from 'obs-store'
 import ethUtil from 'ethereumjs-util'
 import { ethErrors } from 'eth-json-rpc-errors'
 import createId from './random-id'
+import { MESSAGE_TYPE } from './enums'
 
 const hexRe = /^[0-9A-Fa-f]+$/g
 import log from 'loglevel'
@@ -124,7 +125,7 @@ export default class DecryptMessageManager extends EventEmitter {
       msgParams: msgParams,
       time: time,
       status: 'unapproved',
-      type: 'eth_decrypt',
+      type: MESSAGE_TYPE.ETH_DECRYPT,
     }
     this.addMsg(msgData)
 
diff --git a/app/scripts/lib/encryption-public-key-manager.js b/app/scripts/lib/encryption-public-key-manager.js
index 4055104c0..a714f60e4 100644
--- a/app/scripts/lib/encryption-public-key-manager.js
+++ b/app/scripts/lib/encryption-public-key-manager.js
@@ -3,6 +3,7 @@ import ObservableStore from 'obs-store'
 import { ethErrors } from 'eth-json-rpc-errors'
 import createId from './random-id'
 import log from 'loglevel'
+import { MESSAGE_TYPE } from './enums'
 
 /**
  * Represents, and contains data about, an 'eth_getEncryptionPublicKey' type request. These are created when
@@ -114,7 +115,7 @@ export default class EncryptionPublicKeyManager extends EventEmitter {
       msgParams: address,
       time: time,
       status: 'unapproved',
-      type: 'eth_getEncryptionPublicKey',
+      type: MESSAGE_TYPE.ETH_GET_ENCRYPTION_PUBLIC_KEY,
     }
 
     if (req) {
diff --git a/app/scripts/lib/enums.js b/app/scripts/lib/enums.js
index 50a8ccf68..4e6efc07e 100644
--- a/app/scripts/lib/enums.js
+++ b/app/scripts/lib/enums.js
@@ -9,11 +9,20 @@ const PLATFORM_EDGE = 'Edge'
 const PLATFORM_FIREFOX = 'Firefox'
 const PLATFORM_OPERA = 'Opera'
 
+const MESSAGE_TYPE = {
+  ETH_DECRYPT: 'eth_decrypt',
+  ETH_GET_ENCRYPTION_PUBLIC_KEY: 'eth_getEncryptionPublicKey',
+  ETH_SIGN: 'eth_sign',
+  ETH_SIGN_TYPED_DATA: 'eth_signTypedData',
+  PERSONAL_SIGN: 'personal_sign',
+}
+
 export {
   ENVIRONMENT_TYPE_POPUP,
   ENVIRONMENT_TYPE_NOTIFICATION,
   ENVIRONMENT_TYPE_FULLSCREEN,
   ENVIRONMENT_TYPE_BACKGROUND,
+  MESSAGE_TYPE,
   PLATFORM_BRAVE,
   PLATFORM_CHROME,
   PLATFORM_EDGE,
diff --git a/app/scripts/lib/message-manager.js b/app/scripts/lib/message-manager.js
index 387ccce47..228b407a8 100644
--- a/app/scripts/lib/message-manager.js
+++ b/app/scripts/lib/message-manager.js
@@ -3,6 +3,7 @@ import ObservableStore from 'obs-store'
 import ethUtil from 'ethereumjs-util'
 import { ethErrors } from 'eth-json-rpc-errors'
 import createId from './random-id'
+import { MESSAGE_TYPE } from './enums'
 
 /**
  * Represents, and contains data about, an 'eth_sign' type signature request. These are created when a signature for
@@ -116,7 +117,7 @@ export default class MessageManager extends EventEmitter {
       msgParams: msgParams,
       time: time,
       status: 'unapproved',
-      type: 'eth_sign',
+      type: MESSAGE_TYPE.ETH_SIGN,
     }
     this.addMsg(msgData)
 
diff --git a/app/scripts/lib/personal-message-manager.js b/app/scripts/lib/personal-message-manager.js
index 88cdee44b..1050abefd 100644
--- a/app/scripts/lib/personal-message-manager.js
+++ b/app/scripts/lib/personal-message-manager.js
@@ -3,6 +3,7 @@ import ObservableStore from 'obs-store'
 import ethUtil from 'ethereumjs-util'
 import { ethErrors } from 'eth-json-rpc-errors'
 import createId from './random-id'
+import { MESSAGE_TYPE } from './enums'
 
 const hexRe = /^[0-9A-Fa-f]+$/g
 import log from 'loglevel'
@@ -125,7 +126,7 @@ export default class PersonalMessageManager extends EventEmitter {
       msgParams: msgParams,
       time: time,
       status: 'unapproved',
-      type: 'personal_sign',
+      type: MESSAGE_TYPE.PERSONAL_SIGN,
     }
     this.addMsg(msgData)
 
diff --git a/app/scripts/lib/typed-message-manager.js b/app/scripts/lib/typed-message-manager.js
index 346051e30..147180ffd 100644
--- a/app/scripts/lib/typed-message-manager.js
+++ b/app/scripts/lib/typed-message-manager.js
@@ -6,7 +6,7 @@ import { ethErrors } from 'eth-json-rpc-errors'
 import sigUtil from 'eth-sig-util'
 import log from 'loglevel'
 import jsonschema from 'jsonschema'
-
+import { MESSAGE_TYPE } from './enums'
 /**
  * Represents, and contains data about, an 'eth_signTypedData' type signature request. These are created when a
  * signature for an eth_signTypedData call is requested.
@@ -118,7 +118,7 @@ export default class TypedMessageManager extends EventEmitter {
       msgParams: msgParams,
       time: time,
       status: 'unapproved',
-      type: 'eth_signTypedData',
+      type: MESSAGE_TYPE.ETH_SIGN_TYPED_DATA,
     }
     this.addMsg(msgData)
 
diff --git a/ui/app/components/app/signature-request-original/signature-request-original.component.js b/ui/app/components/app/signature-request-original/signature-request-original.component.js
index 01bb0b8c4..b89d6f1e8 100644
--- a/ui/app/components/app/signature-request-original/signature-request-original.component.js
+++ b/ui/app/components/app/signature-request-original/signature-request-original.component.js
@@ -4,7 +4,7 @@ import ethUtil from 'ethereumjs-util'
 import classnames from 'classnames'
 import { ObjectInspector } from 'react-inspector'
 
-import { ENVIRONMENT_TYPE_NOTIFICATION } from '../../../../../app/scripts/lib/enums'
+import { ENVIRONMENT_TYPE_NOTIFICATION, MESSAGE_TYPE } from '../../../../../app/scripts/lib/enums'
 import { getEnvironmentType } from '../../../../../app/scripts/lib/util'
 import Identicon from '../../ui/identicon'
 import AccountListItem from '../../../pages/send/account-list-item/account-list-item.component'
@@ -208,11 +208,11 @@ export default class SignatureRequestOriginal extends Component {
     const { txData } = this.props
     const { type, msgParams: { data } } = txData
 
-    if (type === 'personal_sign') {
+    if (type === MESSAGE_TYPE.PERSONAL_SIGN) {
       rows = [{ name: this.context.t('message'), value: this.msgHexToText(data) }]
-    } else if (type === 'eth_signTypedData') {
+    } else if (type === MESSAGE_TYPE.ETH_SIGN_TYPED_DATA) {
       rows = data
-    } else if (type === 'eth_sign') {
+    } else if (type === MESSAGE_TYPE.ETH_SIGN) {
       rows = [{ name: this.context.t('message'), value: data }]
       notice = this.context.t('signNotice')
     }
@@ -223,12 +223,12 @@ export default class SignatureRequestOriginal extends Component {
         { this.renderRequestInfo() }
         <div
           className={classnames('request-signature__notice', {
-            'request-signature__warning': type === 'eth_sign',
+            'request-signature__warning': type === MESSAGE_TYPE.ETH_SIGN,
           })}
         >
           { notice }
           {
-            type === 'eth_sign'
+            type === MESSAGE_TYPE.ETH_SIGN
               ? (
                 <span
                   className="request-signature__help-link"
diff --git a/ui/app/components/app/signature-request-original/signature-request-original.container.js b/ui/app/components/app/signature-request-original/signature-request-original.container.js
index 26ddad485..aa3a20035 100644
--- a/ui/app/components/app/signature-request-original/signature-request-original.container.js
+++ b/ui/app/components/app/signature-request-original/signature-request-original.container.js
@@ -2,6 +2,7 @@ import { connect } from 'react-redux'
 import { compose } from 'redux'
 import { withRouter } from 'react-router-dom'
 
+import { MESSAGE_TYPE } from '../../../../../app/scripts/lib/enums'
 import { goHome } from '../../../store/actions'
 import {
   accountsWithSendEtherInfoSelector,
@@ -50,13 +51,13 @@ function mergeProps (stateProps, dispatchProps, ownProps) {
 
   let cancel
   let sign
-  if (type === 'personal_sign') {
+  if (type === MESSAGE_TYPE.PERSONAL_SIGN) {
     cancel = cancelPersonalMessage
     sign = signPersonalMessage
-  } else if (type === 'eth_signTypedData') {
+  } else if (type === MESSAGE_TYPE.ETH_SIGN_TYPED_DATA) {
     cancel = cancelTypedMessage
     sign = signTypedMessage
-  } else if (type === 'eth_sign') {
+  } else if (type === MESSAGE_TYPE.ETH_SIGN) {
     cancel = cancelMessage
     sign = signMessage
   }
diff --git a/ui/app/components/app/signature-request/signature-request.container.js b/ui/app/components/app/signature-request/signature-request.container.js
index d97cc37b1..10976e66b 100644
--- a/ui/app/components/app/signature-request/signature-request.container.js
+++ b/ui/app/components/app/signature-request/signature-request.container.js
@@ -5,6 +5,7 @@ import {
   accountsWithSendEtherInfoSelector,
 } from '../../../selectors'
 import { getAccountByAddress } from '../../../helpers/utils/util'
+import { MESSAGE_TYPE } from '../../../../../app/scripts/lib/enums'
 
 function mapStateToProps (state) {
   return {
@@ -38,13 +39,13 @@ function mergeProps (stateProps, dispatchProps, ownProps) {
   let cancel
   let sign
 
-  if (type === 'personal_sign') {
+  if (type === MESSAGE_TYPE.PERSONAL_SIGN) {
     cancel = cancelPersonalMessage
     sign = signPersonalMessage
-  } else if (type === 'eth_signTypedData') {
+  } else if (type === MESSAGE_TYPE.ETH_SIGN_TYPED_DATA) {
     cancel = cancelTypedMessage
     sign = signTypedMessage
-  } else if (type === 'eth_sign') {
+  } else if (type === MESSAGE_TYPE.ETH_SIGN) {
     cancel = cancelMessage
     sign = signMessage
   }
diff --git a/ui/app/helpers/utils/transactions.util.js b/ui/app/helpers/utils/transactions.util.js
index ef16b2a71..71230e593 100644
--- a/ui/app/helpers/utils/transactions.util.js
+++ b/ui/app/helpers/utils/transactions.util.js
@@ -6,6 +6,7 @@ import {
   TRANSACTION_TYPE_CANCEL,
   TRANSACTION_STATUS_CONFIRMED,
 } from '../../../../app/scripts/controllers/transactions/enums'
+import { MESSAGE_TYPE } from '../../../../app/scripts/lib/enums'
 import prefixForNetwork from '../../../lib/etherscan-prefix-for-network'
 import fetchWithCache from './fetch-with-cache'
 
@@ -137,9 +138,9 @@ export function getTransactionActionKey (transaction) {
   }
 
   if (msgParams) {
-    if (type === 'eth_decrypt') {
+    if (type === MESSAGE_TYPE.ETH_DECRYPT) {
       return DECRYPT_REQUEST_KEY
-    } else if (type === 'eth_getEncryptionPublicKey') {
+    } else if (type === MESSAGE_TYPE.ETH_GET_ENCRYPTION_PUBLIC_KEY) {
       return ENCRYPTION_PUBLIC_KEY_REQUEST_KEY
     } else {
       return SIGNATURE_REQUEST_KEY
diff --git a/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.component.js b/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.component.js
index 2ed2ab1e6..02014ee37 100644
--- a/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.component.js
+++ b/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.component.js
@@ -21,6 +21,7 @@ import {
   DEPLOY_CONTRACT_ACTION_KEY,
   SEND_ETHER_ACTION_KEY,
 } from '../../helpers/constants/transactions'
+import { MESSAGE_TYPE } from '../../../../app/scripts/lib/enums'
 
 export default class ConfirmTransactionSwitch extends Component {
   static propTypes = {
@@ -74,9 +75,9 @@ export default class ConfirmTransactionSwitch extends Component {
       return this.redirectToTransaction()
     } else if (txData.msgParams) {
       let pathname = `${CONFIRM_TRANSACTION_ROUTE}/${txData.id}${SIGNATURE_REQUEST_PATH}`
-      if (txData.type === 'eth_decrypt') {
+      if (txData.type === MESSAGE_TYPE.ETH_DECRYPT) {
         pathname = `${CONFIRM_TRANSACTION_ROUTE}/${txData.id}${DECRYPT_MESSAGE_REQUEST_PATH}`
-      } else if (txData.type === 'eth_getEncryptionPublicKey') {
+      } else if (txData.type === MESSAGE_TYPE.ETH_GET_ENCRYPTION_PUBLIC_KEY) {
         pathname = `${CONFIRM_TRANSACTION_ROUTE}/${txData.id}${ENCRYPTION_PUBLIC_KEY_REQUEST_PATH}`
       }
       return <Redirect to={{ pathname }} />
diff --git a/ui/app/pages/confirm-transaction/conf-tx.js b/ui/app/pages/confirm-transaction/conf-tx.js
index fcbf28094..da5345084 100644
--- a/ui/app/pages/confirm-transaction/conf-tx.js
+++ b/ui/app/pages/confirm-transaction/conf-tx.js
@@ -11,6 +11,7 @@ import SignatureRequest from '../../components/app/signature-request'
 import SignatureRequestOriginal from '../../components/app/signature-request-original'
 import Loading from '../../components/ui/loading-screen'
 import { getMostRecentOverviewPage } from '../../ducks/history/history'
+import { MESSAGE_TYPE } from '../../../../app/scripts/lib/enums'
 
 function mapStateToProps (state) {
   const { metamask, appState } = state
@@ -111,7 +112,7 @@ class ConfirmTxScreen extends Component {
 
   signatureSelect (type, version) {
     // Temporarily direct only v3 and v4 requests to new code.
-    if (type === 'eth_signTypedData' && (version === 'V3' || version === 'V4')) {
+    if (type === MESSAGE_TYPE.ETH_SIGN_TYPED_DATA && (version === 'V3' || version === 'V4')) {
       return SignatureRequest
     }