diff --git a/src/dialer/dial-request.js b/src/dialer/dial-request.js
index 707f4e2171..397fc784c4 100644
--- a/src/dialer/dial-request.js
+++ b/src/dialer/dial-request.js
@@ -7,6 +7,7 @@ const FIFO = require('p-fifo')
 const pAny = require('p-any')
 // @ts-expect-error setMaxListeners is missing from the types
 const { setMaxListeners } = require('events')
+const { codes } = require('../errors')
 
 /**
  * @typedef {import('libp2p-interfaces/src/connection').Connection} Connection
@@ -55,7 +56,7 @@ class DialRequest {
     const tokens = this.dialer.getTokens(this.addrs.length)
     // If no tokens are available, throw
     if (tokens.length < 1) {
-      throw errCode(new Error('No dial tokens available'), 'ERR_NO_DIAL_TOKENS')
+      throw errCode(new Error('No dial tokens available'), codes.ERR_NO_DIAL_TOKENS)
     }
 
     const tokenHolder = new FIFO()
diff --git a/src/errors.js b/src/errors.js
index efaed29c06..a5db3901b1 100644
--- a/src/errors.js
+++ b/src/errors.js
@@ -36,5 +36,29 @@ exports.codes = {
   ERR_TRANSPORT_DIAL_FAILED: 'ERR_TRANSPORT_DIAL_FAILED',
   ERR_UNSUPPORTED_PROTOCOL: 'ERR_UNSUPPORTED_PROTOCOL',
   ERR_INVALID_MULTIADDR: 'ERR_INVALID_MULTIADDR',
-  ERR_SIGNATURE_NOT_VALID: 'ERR_SIGNATURE_NOT_VALID'
+  ERR_SIGNATURE_NOT_VALID: 'ERR_SIGNATURE_NOT_VALID',
+  ERR_FIND_SELF: 'ERR_FIND_SELF',
+  ERR_NO_ROUTERS: 'ERR_NO_ROUTERS',
+  ERR_CONNECTION_NOT_MULTIPLEXED: 'ERR_CONNECTION_NOT_MULTIPLEXED',
+  ERR_NO_DIAL_TOKENS: 'ERR_NO_DIAL_TOKENS',
+  ERR_KEYCHAIN_REQUIRED: 'ERR_KEYCHAIN_REQUIRED',
+  ERR_INVALID_CMS: 'ERR_INVALID_CMS',
+  ERR_MISSING_KEYS: 'ERR_MISSING_KEYS',
+  ERR_NO_KEY: 'ERR_NO_KEY',
+  ERR_INVALID_KEY_NAME: 'ERR_INVALID_KEY_NAME',
+  ERR_INVALID_KEY_TYPE: 'ERR_INVALID_KEY_TYPE',
+  ERR_KEY_ALREADY_EXISTS: 'ERR_KEY_ALREADY_EXISTS',
+  ERR_INVALID_KEY_SIZE: 'ERR_INVALID_KEY_SIZE',
+  ERR_KEY_NOT_FOUND: 'ERR_KEY_NOT_FOUND',
+  ERR_OLD_KEY_NAME_INVALID: 'ERR_OLD_KEY_NAME_INVALID',
+  ERR_NEW_KEY_NAME_INVALID: 'ERR_NEW_KEY_NAME_INVALID',
+  ERR_PASSWORD_REQUIRED: 'ERR_PASSWORD_REQUIRED',
+  ERR_PEM_REQUIRED: 'ERR_PEM_REQUIRED',
+  ERR_CANNOT_READ_KEY: 'ERR_CANNOT_READ_KEY',
+  ERR_MISSING_PRIVATE_KEY: 'ERR_MISSING_PRIVATE_KEY',
+  ERR_INVALID_OLD_PASS_TYPE: 'ERR_INVALID_OLD_PASS_TYPE',
+  ERR_INVALID_NEW_PASS_TYPE: 'ERR_INVALID_NEW_PASS_TYPE',
+  ERR_INVALID_PASS_LENGTH: 'ERR_INVALID_PASS_LENGTH',
+  ERR_NOT_IMPLEMENTED: 'ERR_NOT_IMPLEMENTED',
+  ERR_WRONG_PING_ACK: 'ERR_WRONG_PING_ACK'
 }
diff --git a/src/keychain/cms.js b/src/keychain/cms.js
index e9361882df..f929cb4e71 100644
--- a/src/keychain/cms.js
+++ b/src/keychain/cms.js
@@ -10,6 +10,7 @@ const { certificateForKey, findAsync } = require('./util')
 const errcode = require('err-code')
 const { fromString: uint8ArrayFromString } = require('uint8arrays/from-string')
 const { toString: uint8ArrayToString } = require('uint8arrays/to-string')
+const { codes } = require('../errors')
 
 const privates = new WeakMap()
 
@@ -31,7 +32,7 @@ class CMS {
    */
   constructor (keychain, dek) {
     if (!keychain) {
-      throw errcode(new Error('keychain is required'), 'ERR_KEYCHAIN_REQUIRED')
+      throw errcode(new Error('keychain is required'), codes.ERR_KEYCHAIN_REQUIRED)
     }
 
     this.keychain = keychain
@@ -49,7 +50,7 @@ class CMS {
    */
   async encrypt (name, plain) {
     if (!(plain instanceof Uint8Array)) {
-      throw errcode(new Error('Plain data must be a Uint8Array'), 'ERR_INVALID_PARAMS')
+      throw errcode(new Error('Plain data must be a Uint8Array'), codes.ERR_INVALID_PARAMETERS)
     }
 
     const key = await this.keychain.findKeyByName(name)
@@ -81,7 +82,7 @@ class CMS {
    */
   async decrypt (cmsData) {
     if (!(cmsData instanceof Uint8Array)) {
-      throw errcode(new Error('CMS data is required'), 'ERR_INVALID_PARAMS')
+      throw errcode(new Error('CMS data is required'), codes.ERR_INVALID_PARAMETERS)
     }
 
     let cms
@@ -91,7 +92,7 @@ class CMS {
       // @ts-ignore not defined
       cms = forge.pkcs7.messageFromAsn1(obj)
     } catch (/** @type {any} */ err) {
-      throw errcode(new Error('Invalid CMS: ' + err.message), 'ERR_INVALID_CMS')
+      throw errcode(new Error('Invalid CMS: ' + err.message), codes.ERR_INVALID_CMS)
     }
 
     // Find a recipient whose key we hold. We only deal with recipient certs
@@ -123,7 +124,7 @@ class CMS {
     if (!r) {
       // @ts-ignore cms types not defined
       const missingKeys = recipients.map(r => r.keyId)
-      throw errcode(new Error('Decryption needs one of the key(s): ' + missingKeys.join(', ')), 'ERR_MISSING_KEYS', {
+      throw errcode(new Error('Decryption needs one of the key(s): ' + missingKeys.join(', ')), codes.ERR_MISSING_KEYS, {
         missingKeys
       })
     }
@@ -131,7 +132,7 @@ class CMS {
     const key = await this.keychain.findKeyById(r.keyId)
 
     if (!key) {
-      throw errcode(new Error('No key available to decrypto'), 'ERR_NO_KEY')
+      throw errcode(new Error('No key available to decrypto'), codes.ERR_NO_KEY)
     }
 
     const pem = await this.keychain._getPrivateKey(key.name)
diff --git a/src/keychain/index.js b/src/keychain/index.js
index b25be5a854..f6a17ab62e 100644
--- a/src/keychain/index.js
+++ b/src/keychain/index.js
@@ -10,6 +10,7 @@ const crypto = require('libp2p-crypto')
 const { Key } = require('interface-datastore/key')
 const CMS = require('./cms')
 const errcode = require('err-code')
+const { codes } = require('../errors')
 const { toString: uint8ArrayToString } = require('uint8arrays/to-string')
 const { fromString: uint8ArrayFromString } = require('uint8arrays/from-string')
 
@@ -210,21 +211,21 @@ class Keychain {
     const self = this
 
     if (!validateKeyName(name) || name === 'self') {
-      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), 'ERR_INVALID_KEY_NAME'))
+      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), codes.ERR_INVALID_KEY_NAME))
     }
 
     if (typeof type !== 'string') {
-      return throwDelayed(errcode(new Error(`Invalid key type '${type}'`), 'ERR_INVALID_KEY_TYPE'))
+      return throwDelayed(errcode(new Error(`Invalid key type '${type}'`), codes.ERR_INVALID_KEY_TYPE))
     }
 
     const dsname = DsName(name)
     const exists = await self.store.has(dsname)
-    if (exists) return throwDelayed(errcode(new Error(`Key '${name}' already exists`), 'ERR_KEY_ALREADY_EXISTS'))
+    if (exists) return throwDelayed(errcode(new Error(`Key '${name}' already exists`), codes.ERR_KEY_ALREADY_EXISTS))
 
     switch (type.toLowerCase()) {
       case 'rsa':
         if (!Number.isSafeInteger(size) || size < 2048) {
-          return throwDelayed(errcode(new Error(`Invalid RSA key size ${size}`), 'ERR_INVALID_KEY_SIZE'))
+          return throwDelayed(errcode(new Error(`Invalid RSA key size ${size}`), codes.ERR_INVALID_KEY_SIZE))
         }
         break
       default:
@@ -297,7 +298,7 @@ class Keychain {
    */
   async findKeyByName (name) {
     if (!validateKeyName(name)) {
-      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), 'ERR_INVALID_KEY_NAME'))
+      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), codes.ERR_INVALID_KEY_NAME))
     }
 
     const dsname = DsInfoName(name)
@@ -305,7 +306,7 @@ class Keychain {
       const res = await this.store.get(dsname)
       return JSON.parse(uint8ArrayToString(res))
     } catch (/** @type {any} */ err) {
-      return throwDelayed(errcode(new Error(`Key '${name}' does not exist. ${err.message}`), 'ERR_KEY_NOT_FOUND'))
+      return throwDelayed(errcode(new Error(`Key '${name}' does not exist. ${err.message}`), codes.ERR_KEY_NOT_FOUND))
     }
   }
 
@@ -318,7 +319,7 @@ class Keychain {
   async removeKey (name) {
     const self = this
     if (!validateKeyName(name) || name === 'self') {
-      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), 'ERR_INVALID_KEY_NAME'))
+      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), codes.ERR_INVALID_KEY_NAME))
     }
     const dsname = DsName(name)
     const keyInfo = await self.findKeyByName(name)
@@ -339,10 +340,10 @@ class Keychain {
   async renameKey (oldName, newName) {
     const self = this
     if (!validateKeyName(oldName) || oldName === 'self') {
-      return throwDelayed(errcode(new Error(`Invalid old key name '${oldName}'`), 'ERR_OLD_KEY_NAME_INVALID'))
+      return throwDelayed(errcode(new Error(`Invalid old key name '${oldName}'`), codes.ERR_OLD_KEY_NAME_INVALID))
     }
     if (!validateKeyName(newName) || newName === 'self') {
-      return throwDelayed(errcode(new Error(`Invalid new key name '${newName}'`), 'ERR_NEW_KEY_NAME_INVALID'))
+      return throwDelayed(errcode(new Error(`Invalid new key name '${newName}'`), codes.ERR_NEW_KEY_NAME_INVALID))
     }
     const oldDsname = DsName(oldName)
     const newDsname = DsName(newName)
@@ -350,7 +351,7 @@ class Keychain {
     const newInfoName = DsInfoName(newName)
 
     const exists = await self.store.has(newDsname)
-    if (exists) return throwDelayed(errcode(new Error(`Key '${newName}' already exists`), 'ERR_KEY_ALREADY_EXISTS'))
+    if (exists) return throwDelayed(errcode(new Error(`Key '${newName}' already exists`), codes.ERR_KEY_ALREADY_EXISTS))
 
     try {
       const pem = await self.store.get(oldDsname)
@@ -379,10 +380,10 @@ class Keychain {
    */
   async exportKey (name, password) {
     if (!validateKeyName(name)) {
-      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), 'ERR_INVALID_KEY_NAME'))
+      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), codes.ERR_INVALID_KEY_NAME))
     }
     if (!password) {
-      return throwDelayed(errcode(new Error('Password is required'), 'ERR_PASSWORD_REQUIRED'))
+      return throwDelayed(errcode(new Error('Password is required'), codes.ERR_PASSWORD_REQUIRED))
     }
 
     const dsname = DsName(name)
@@ -409,20 +410,20 @@ class Keychain {
   async importKey (name, pem, password) {
     const self = this
     if (!validateKeyName(name) || name === 'self') {
-      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), 'ERR_INVALID_KEY_NAME'))
+      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), codes.ERR_INVALID_KEY_NAME))
     }
     if (!pem) {
-      return throwDelayed(errcode(new Error('PEM encoded key is required'), 'ERR_PEM_REQUIRED'))
+      return throwDelayed(errcode(new Error('PEM encoded key is required'), codes.ERR_PEM_REQUIRED))
     }
     const dsname = DsName(name)
     const exists = await self.store.has(dsname)
-    if (exists) return throwDelayed(errcode(new Error(`Key '${name}' already exists`), 'ERR_KEY_ALREADY_EXISTS'))
+    if (exists) return throwDelayed(errcode(new Error(`Key '${name}' already exists`), codes.ERR_KEY_ALREADY_EXISTS))
 
     let privateKey
     try {
       privateKey = await crypto.keys.import(pem, password)
     } catch (/** @type {any} */ err) {
-      return throwDelayed(errcode(new Error('Cannot read the key, most likely the password is wrong'), 'ERR_CANNOT_READ_KEY'))
+      return throwDelayed(errcode(new Error('Cannot read the key, most likely the password is wrong'), codes.ERR_CANNOT_READ_KEY))
     }
 
     let kid
@@ -457,16 +458,16 @@ class Keychain {
   async importPeer (name, peer) {
     const self = this
     if (!validateKeyName(name)) {
-      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), 'ERR_INVALID_KEY_NAME'))
+      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), codes.ERR_INVALID_KEY_NAME))
     }
     if (!peer || !peer.privKey) {
-      return throwDelayed(errcode(new Error('Peer.privKey is required'), 'ERR_MISSING_PRIVATE_KEY'))
+      return throwDelayed(errcode(new Error('Peer.privKey is required'), codes.ERR_MISSING_PRIVATE_KEY))
     }
 
     const privateKey = peer.privKey
     const dsname = DsName(name)
     const exists = await self.store.has(dsname)
-    if (exists) return throwDelayed(errcode(new Error(`Key '${name}' already exists`), 'ERR_KEY_ALREADY_EXISTS'))
+    if (exists) return throwDelayed(errcode(new Error(`Key '${name}' already exists`), codes.ERR_KEY_ALREADY_EXISTS))
 
     try {
       const kid = await privateKey.id()
@@ -495,7 +496,7 @@ class Keychain {
    */
   async _getPrivateKey (name) {
     if (!validateKeyName(name)) {
-      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), 'ERR_INVALID_KEY_NAME'))
+      return throwDelayed(errcode(new Error(`Invalid key name '${name}'`), codes.ERR_INVALID_KEY_NAME))
     }
 
     try {
@@ -503,7 +504,7 @@ class Keychain {
       const res = await this.store.get(dsname)
       return uint8ArrayToString(res)
     } catch (/** @type {any} */ err) {
-      return throwDelayed(errcode(new Error(`Key '${name}' does not exist. ${err.message}`), 'ERR_KEY_NOT_FOUND'))
+      return throwDelayed(errcode(new Error(`Key '${name}' does not exist. ${err.message}`), codes.ERR_KEY_NOT_FOUND))
     }
   }
 
@@ -515,13 +516,13 @@ class Keychain {
    */
   async rotateKeychainPass (oldPass, newPass) {
     if (typeof oldPass !== 'string') {
-      return throwDelayed(errcode(new Error(`Invalid old pass type '${typeof oldPass}'`), 'ERR_INVALID_OLD_PASS_TYPE'))
+      return throwDelayed(errcode(new Error(`Invalid old pass type '${typeof oldPass}'`), codes.ERR_INVALID_OLD_PASS_TYPE))
     }
     if (typeof newPass !== 'string') {
-      return throwDelayed(errcode(new Error(`Invalid new pass type '${typeof newPass}'`), 'ERR_INVALID_NEW_PASS_TYPE'))
+      return throwDelayed(errcode(new Error(`Invalid new pass type '${typeof newPass}'`), codes.ERR_INVALID_NEW_PASS_TYPE))
     }
     if (newPass.length < 20) {
-      return throwDelayed(errcode(new Error(`Invalid pass length ${newPass.length}`), 'ERR_INVALID_PASS_LENGTH'))
+      return throwDelayed(errcode(new Error(`Invalid pass length ${newPass.length}`), codes.ERR_INVALID_PASS_LENGTH))
     }
     log('recreating keychain')
     const oldDek = privates.get(this).dek
diff --git a/src/peer-routing.js b/src/peer-routing.js
index 2ffa5cfd74..a49e847c1c 100644
--- a/src/peer-routing.js
+++ b/src/peer-routing.js
@@ -5,6 +5,7 @@ const log = Object.assign(debug('libp2p:peer-routing'), {
   error: debug('libp2p:peer-routing:err')
 })
 const errCode = require('err-code')
+const errors = require('./errors')
 const {
   storeAddresses,
   uniquePeers,
@@ -104,11 +105,11 @@ class PeerRouting {
    */
   async findPeer (id, options) { // eslint-disable-line require-await
     if (!this._routers.length) {
-      throw errCode(new Error('No peer routers available'), 'NO_ROUTERS_AVAILABLE')
+      throw errCode(new Error('No peer routers available'), errors.codes.ERR_NO_ROUTERS)
     }
 
     if (id.toB58String() === this._peerId.toB58String()) {
-      throw errCode(new Error('Should not try to find self'), 'ERR_FIND_SELF')
+      throw errCode(new Error('Should not try to find self'), errors.codes.ERR_FIND_SELF)
     }
 
     const output = await pipe(
@@ -125,7 +126,7 @@ class PeerRouting {
       return output
     }
 
-    throw errCode(new Error('not found'), 'NOT_FOUND')
+    throw errCode(new Error(errors.messages.NOT_FOUND), errors.codes.ERR_NOT_FOUND)
   }
 
   /**
@@ -139,7 +140,7 @@ class PeerRouting {
    */
   async * getClosestPeers (key, options = { timeout: 30e3 }) {
     if (!this._routers.length) {
-      throw errCode(new Error('No peer routers available'), 'NO_ROUTERS_AVAILABLE')
+      throw errCode(new Error('No peer routers available'), errors.codes.ERR_NO_ROUTERS)
     }
 
     if (options.timeout) {
diff --git a/src/peer-store/book.js b/src/peer-store/book.js
index 9b6d561b1e..3de0459486 100644
--- a/src/peer-store/book.js
+++ b/src/peer-store/book.js
@@ -2,10 +2,7 @@
 
 const errcode = require('err-code')
 const PeerId = require('peer-id')
-
-const {
-  codes: { ERR_INVALID_PARAMETERS }
-} = require('../errors')
+const { codes } = require('../errors')
 
 /**
  * @param {any} data
@@ -48,7 +45,7 @@ class Book {
    * @param {any[]|any} data
    */
   set (peerId, data) {
-    throw errcode(new Error('set must be implemented by the subclass'), 'ERR_NOT_IMPLEMENTED')
+    throw errcode(new Error('set must be implemented by the subclass'), codes.ERR_NOT_IMPLEMENTED)
   }
 
   /**
@@ -94,7 +91,7 @@ class Book {
    */
   get (peerId) {
     if (!PeerId.isPeerId(peerId)) {
-      throw errcode(new Error('peerId must be an instance of peer-id'), ERR_INVALID_PARAMETERS)
+      throw errcode(new Error('peerId must be an instance of peer-id'), codes.ERR_INVALID_PARAMETERS)
     }
 
     const rec = this.data.get(peerId.toB58String())
@@ -111,7 +108,7 @@ class Book {
    */
   delete (peerId) {
     if (!PeerId.isPeerId(peerId)) {
-      throw errcode(new Error('peerId must be an instance of peer-id'), ERR_INVALID_PARAMETERS)
+      throw errcode(new Error('peerId must be an instance of peer-id'), codes.ERR_INVALID_PARAMETERS)
     }
 
     if (!this.data.delete(peerId.toB58String())) {
diff --git a/src/ping/index.js b/src/ping/index.js
index 758c0ccabd..15b2692399 100644
--- a/src/ping/index.js
+++ b/src/ping/index.js
@@ -5,7 +5,7 @@ const log = Object.assign(debug('libp2p:ping'), {
   error: debug('libp2p:ping:err')
 })
 const errCode = require('err-code')
-
+const { codes } = require('../errors')
 const crypto = require('libp2p-crypto')
 const { pipe } = require('it-pipe')
 // @ts-ignore it-buffer has no types exported
@@ -50,7 +50,7 @@ async function ping (node, peer) {
   const end = Date.now()
 
   if (!equals(data, result)) {
-    throw errCode(new Error('Received wrong ping ack'), 'ERR_WRONG_PING_ACK')
+    throw errCode(new Error('Received wrong ping ack'), codes.ERR_WRONG_PING_ACK)
   }
 
   return end - start
diff --git a/src/upgrader.js b/src/upgrader.js
index 8b07be9731..23f9a338b9 100644
--- a/src/upgrader.js
+++ b/src/upgrader.js
@@ -297,7 +297,7 @@ class Upgrader {
     maConn.timeline.upgraded = Date.now()
 
     const errConnectionNotMultiplexed = () => {
-      throw errCode(new Error('connection is not multiplexed'), 'ERR_CONNECTION_NOT_MULTIPLEXED')
+      throw errCode(new Error('connection is not multiplexed'), codes.ERR_CONNECTION_NOT_MULTIPLEXED)
     }
 
     // Create the connection
diff --git a/test/keychain/keychain.spec.js b/test/keychain/keychain.spec.js
index 0404ebf03e..070a233da4 100644
--- a/test/keychain/keychain.spec.js
+++ b/test/keychain/keychain.spec.js
@@ -296,7 +296,7 @@ describe('keychain', () => {
     it('requires plain data as a Uint8Array', async () => {
       const err = await ks.cms.encrypt(rsaKeyName, 'plain data').then(fail, err => err)
       expect(err).to.exist()
-      expect(err).to.have.property('code', 'ERR_INVALID_PARAMS')
+      expect(err).to.have.property('code', 'ERR_INVALID_PARAMETERS')
     })
 
     it('encrypts', async () => {
@@ -308,7 +308,7 @@ describe('keychain', () => {
     it('is a PKCS #7 message', async () => {
       const err = await ks.cms.decrypt('not CMS').then(fail, err => err)
       expect(err).to.exist()
-      expect(err).to.have.property('code', 'ERR_INVALID_PARAMS')
+      expect(err).to.have.property('code', 'ERR_INVALID_PARAMETERS')
     })
 
     it('is a PKCS #7 binary message', async () => {