diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 0000000..5538d2f
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,4 @@
+node_modules/
+coverage/
+.nyc_output/
+docs/
diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..02d96ef
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,17 @@
+module.exports = {
+  env: {
+    commonjs: true,
+    es2021: true,
+    node: true
+  },
+  extends: [
+    'standard'
+  ],
+  rules: {
+    'no-shadow': 'error',
+    'no-unused-vars': ['error', {
+      argsIgnorePattern: '^_',
+      caughtErrorsIgnorePattern: '^_'
+    }]
+  }
+}
diff --git a/lib/client/client.js b/lib/client/client.js
index 5ee6090..d090cca 100644
--- a/lib/client/client.js
+++ b/lib/client/client.js
@@ -418,25 +418,25 @@ Client.prototype.modify = function modify (name, change, controls, callback) {
 
   const changes = []
 
-  function changeFromObject (change) {
-    if (!change.operation && !change.type) { throw new Error('change.operation required') }
-    if (typeof (change.modification) !== 'object') { throw new Error('change.modification (object) required') }
+  function changeFromObject (obj) {
+    if (!obj.operation && !obj.type) { throw new Error('change.operation required') }
+    if (typeof (obj.modification) !== 'object') { throw new Error('change.modification (object) required') }
 
-    if (Object.keys(change.modification).length === 2 &&
-        typeof (change.modification.type) === 'string' &&
-        Array.isArray(change.modification.vals)) {
+    if (Object.keys(obj.modification).length === 2 &&
+        typeof (obj.modification.type) === 'string' &&
+        Array.isArray(obj.modification.vals)) {
       // Use modification directly if it's already normalized:
       changes.push(new Change({
-        operation: change.operation || change.type,
-        modification: change.modification
+        operation: obj.operation || obj.type,
+        modification: obj.modification
       }))
     } else {
       // Normalize the modification object
-      Object.keys(change.modification).forEach(function (k) {
+      Object.keys(obj.modification).forEach(function (k) {
         const mod = {}
-        mod[k] = change.modification[k]
+        mod[k] = obj.modification[k]
         changes.push(new Change({
-          operation: change.operation || change.type,
+          operation: obj.operation || obj.type,
           modification: mod
         }))
       })
@@ -679,9 +679,9 @@ Client.prototype.starttls = function starttls (options,
     return callback(new Error('STARTTLS already in progress or active'))
   }
 
-  function onSend (err, emitter) {
-    if (err) {
-      callback(err)
+  function onSend (sendErr, emitter) {
+    if (sendErr) {
+      callback(sendErr)
       return
     }
     /*
@@ -697,7 +697,7 @@ Client.prototype.starttls = function starttls (options,
       self._starttls = null
       callback(err)
     })
-    emitter.on('end', function (res) {
+    emitter.on('end', function (_res) {
       const sock = self._socket
       /*
        * Unplumb socket data during SSL negotiation.
@@ -850,9 +850,9 @@ Client.prototype.connect = function connect () {
   }
 
   // Initialize socket events and LDAP parser.
-  function initSocket (url) {
+  function initSocket (server) {
     tracker = messageTrackerFactory({
-      id: url ? url.href : self.socketPath,
+      id: server ? server.href : self.socketPath,
       parser: new Parser({ log: log })
     })
 
@@ -938,7 +938,7 @@ Client.prototype.connect = function connect () {
         f(basicClient, callback)
       },
       inputs: self.listeners('setup')
-    }, function (err, res) {
+    }, function (err, _res) {
       if (err) {
         self.emit('setupError', err)
       }
@@ -1001,7 +1001,7 @@ Client.prototype.connect = function connect () {
   }
   retry.failAfter(failAfter)
 
-  retry.on('ready', function (num, delay) {
+  retry.on('ready', function (num, _delay) {
     if (self.destroyed) {
       // Cease connection attempts if destroyed
       return
diff --git a/lib/client/message-tracker/id-generator.js b/lib/client/message-tracker/id-generator.js
index 49423ea..3756314 100644
--- a/lib/client/message-tracker/id-generator.js
+++ b/lib/client/message-tracker/id-generator.js
@@ -16,8 +16,8 @@ const { MAX_MSGID } = require('../constants')
 module.exports = function idGeneratorFactory (start = 0) {
   let currentID = start
   return function nextID () {
-    const nextID = currentID + 1
-    currentID = (nextID >= MAX_MSGID) ? 1 : nextID
+    const id = currentID + 1
+    currentID = (id >= MAX_MSGID) ? 1 : id
     return currentID
   }
 }
diff --git a/lib/client/search_pager.js b/lib/client/search_pager.js
index 122ae79..d44f318 100644
--- a/lib/client/search_pager.js
+++ b/lib/client/search_pager.js
@@ -150,7 +150,7 @@ SearchPager.prototype._nextPage = function _nextPage (cookie) {
 /**
  * Callback provided to the client API for successful transmission.
  */
-SearchPager.prototype._sendCallback = function _sendCallback (err, res) {
+SearchPager.prototype._sendCallback = function _sendCallback (err) {
   if (err) {
     this.finished = true
     if (!this.started) {
diff --git a/lib/messages/abandon_response.js b/lib/messages/abandon_response.js
index 27f0c7d..aa3fbc8 100644
--- a/lib/messages/abandon_response.js
+++ b/lib/messages/abandon_response.js
@@ -23,7 +23,7 @@ Object.defineProperties(AbandonResponse.prototype, {
   }
 })
 
-AbandonResponse.prototype.end = function (status) {}
+AbandonResponse.prototype.end = function (_status) {}
 
 AbandonResponse.prototype._json = function (j) {
   return j
diff --git a/lib/messages/search_entry.js b/lib/messages/search_entry.js
index 21cabb8..036a663 100644
--- a/lib/messages/search_entry.js
+++ b/lib/messages/search_entry.js
@@ -54,7 +54,7 @@ Object.defineProperties(SearchEntry.prototype, {
           obj[a.type] = []
         }
       })
-      this.controls.forEach(function (element, index, array) {
+      this.controls.forEach(function (element) {
         obj.controls.push(element.json)
       })
       return obj
@@ -79,7 +79,7 @@ Object.defineProperties(SearchEntry.prototype, {
           obj[a.type] = []
         }
       })
-      this.controls.forEach(function (element, index, array) {
+      this.controls.forEach(function (element) {
         obj.controls.push(element.json)
       })
       return obj
diff --git a/lib/messages/unbind_response.js b/lib/messages/unbind_response.js
index 77a4d39..3317984 100644
--- a/lib/messages/unbind_response.js
+++ b/lib/messages/unbind_response.js
@@ -31,9 +31,9 @@ Object.defineProperties(UnbindResponse.prototype, {
 /**
  * Special override that just ends the connection, if present.
  *
- * @param {Number} status completely ignored.
+ * @param {Number} _status completely ignored.
  */
-UnbindResponse.prototype.end = function (status) {
+UnbindResponse.prototype.end = function (_status) {
   assert.ok(this.connection)
 
   this.log.trace('%s: unbinding!', this.connection.ldap.id)
diff --git a/lib/persistent_search.js b/lib/persistent_search.js
index 620732e..db0ac3e 100644
--- a/lib/persistent_search.js
+++ b/lib/persistent_search.js
@@ -77,7 +77,7 @@ function getOperationType (requestType) {
   }
 }
 
-function getEntryChangeNotificationControl (req, obj, callback) {
+function getEntryChangeNotificationControl (req, obj) {
   // if we want to return a ECNC
   if (req.persistentSearch.value.returnECs) {
     const attrs = obj.attributes
diff --git a/lib/server.js b/lib/server.js
index 190dede..512c679 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -313,28 +313,28 @@ function Server (options) {
     return c
   }
 
-  function newConnection (c) {
-    setupConnection(c)
-    log.trace('new connection from %s', c.ldap.id)
+  function newConnection (conn) {
+    setupConnection(conn)
+    log.trace('new connection from %s', conn.ldap.id)
 
     dtrace.fire('server-connection', function () {
-      return [c.remoteAddress]
+      return [conn.remoteAddress]
     })
 
-    c.parser = new Parser({
+    conn.parser = new Parser({
       log: options.log
     })
-    c.parser.on('message', function (req) {
-      req.connection = c
-      req.logId = c.ldap.id + '::' + req.messageID
+    conn.parser.on('message', function (req) {
+      req.connection = conn
+      req.logId = conn.ldap.id + '::' + req.messageID
       req.startTime = new Date().getTime()
 
-      log.debug('%s: message received: req=%j', c.ldap.id, req.json)
+      log.debug('%s: message received: req=%j', conn.ldap.id, req.json)
 
       const res = getResponse(req)
       if (!res) {
         log.warn('Unimplemented server method: %s', req.type)
-        c.destroy()
+        conn.destroy()
         return false
       }
 
@@ -368,7 +368,7 @@ function Server (options) {
         }
       }
 
-      res.connection = c
+      res.connection = conn
       res.logId = req.logId
       res.requestDN = req.dn
 
@@ -376,10 +376,10 @@ function Server (options) {
 
       let i = 0
       return (function messageIIFE (err) {
-        function sendError (err) {
-          res.status = err.code || errors.LDAP_OPERATIONS_ERROR
+        function sendError (sendErr) {
+          res.status = sendErr.code || errors.LDAP_OPERATIONS_ERROR
           res.matchedDN = req.suffix ? req.suffix.toString() : ''
-          res.errorMessage = err.message || ''
+          res.errorMessage = sendErr.message || ''
           return res.end()
         }
 
@@ -388,8 +388,8 @@ function Server (options) {
 
           function next () {} // stub out next for the post chain
 
-          self._postChain.forEach(function (c) {
-            c.call(self, req, res, next)
+          self._postChain.forEach(function (cb) {
+            cb.call(self, req, res, next)
           })
         }
 
@@ -404,7 +404,7 @@ function Server (options) {
           const next = messageIIFE
           if (chain.handlers[i]) { return chain.handlers[i++].call(chain.backend, req, res, next) }
 
-          if (req.protocolOp === Protocol.LDAP_REQ_BIND && res.status === 0) { c.ldap.bindDN = req.dn }
+          if (req.protocolOp === Protocol.LDAP_REQ_BIND && res.status === 0) { conn.ldap.bindDN = req.dn }
 
           return after()
         } catch (e) {
@@ -415,23 +415,23 @@ function Server (options) {
       }())
     })
 
-    c.parser.on('error', function (err, message) {
-      self.emit('error', new VError(err, 'Parser error for %s', c.ldap.id))
+    conn.parser.on('error', function (err, message) {
+      self.emit('error', new VError(err, 'Parser error for %s', conn.ldap.id))
 
-      if (!message) { return c.destroy() }
+      if (!message) { return conn.destroy() }
 
       const res = getResponse(message)
-      if (!res) { return c.destroy() }
+      if (!res) { return conn.destroy() }
 
       res.status = 0x02 // protocol error
       res.errorMessage = err.toString()
-      return c.end(res.toBer())
+      return conn.end(res.toBer())
     })
 
-    c.on('data', function (data) {
-      log.trace('data on %s: %s', c.ldap.id, util.inspect(data))
+    conn.on('data', function (data) {
+      log.trace('data on %s: %s', conn.ldap.id, util.inspect(data))
 
-      c.parser.write(data)
+      conn.parser.write(data)
     })
   } // end newConnection
 
diff --git a/package.json b/package.json
index cde6103..ca872a2 100644
--- a/package.json
+++ b/package.json
@@ -27,10 +27,13 @@
     "verror": "^1.8.1"
   },
   "devDependencies": {
+    "eslint": "^7.14.0",
+    "eslint-config-standard": "^16.0.2",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-promise": "^4.2.1",
     "get-port": "^5.1.1",
     "husky": "^4.2.5",
-    "snazzy": "^9.0.0",
-    "standard": "^16.0.0",
     "tap": "14.11.0"
   },
   "scripts": {
@@ -41,12 +44,12 @@
     "test:watch": "tap -n -w --no-coverage-report",
     "test:integration": "tap --no-cov 'test-integration/**/*.test.js'",
     "test:integration:local": "docker-compose up -d && npm run test:integration && docker-compose down",
-    "lint": "standard | snazzy",
-    "lint:ci": "standard"
+    "lint": "eslint . --fix",
+    "lint:ci": "eslint ."
   },
   "husky": {
     "hooks": {
-      "pre-commit": "npm run lint && npm run test"
+      "pre-commit": "npm run lint:ci && npm run test"
     }
   }
 }
diff --git a/test-integration/.eslintrc.js b/test-integration/.eslintrc.js
new file mode 100644
index 0000000..6d4700e
--- /dev/null
+++ b/test-integration/.eslintrc.js
@@ -0,0 +1,5 @@
+module.exports = {
+  rules: {
+    'no-shadow': 'off'
+  }
+}
diff --git a/test-integration/client/issues.test.js b/test-integration/client/issues.test.js
index 4abcc3b..1c52148 100644
--- a/test-integration/client/issues.test.js
+++ b/test-integration/client/issues.test.js
@@ -32,7 +32,7 @@ tap.test('modifyDN with long name (issue #480)', t => {
     client.modifyDN(
       `cn=${longStr},ou=people,dc=planetexpress,dc=com`,
       targetDN,
-      (err, res) => {
+      (err) => {
         t.error(err)
         client.unbind(t.end)
       }
diff --git a/test/.eslintrc.js b/test/.eslintrc.js
new file mode 100644
index 0000000..6d4700e
--- /dev/null
+++ b/test/.eslintrc.js
@@ -0,0 +1,5 @@
+module.exports = {
+  rules: {
+    'no-shadow': 'off'
+  }
+}
diff --git a/test/client.test.js b/test/client.test.js
index fe7e97c..40a93ce 100644
--- a/test/client.test.js
+++ b/test/client.test.js
@@ -79,7 +79,7 @@ tap.beforeEach((done, t) => {
     }, 250)
   })
 
-  server.search('dc=timeout', function (req, res, next) {
+  server.search('dc=timeout', function () {
     // Cause the client to timeout by not sending a response.
   })
 
@@ -721,13 +721,13 @@ tap.test('GH-602 search basic with delayed event listener binding', function (t)
     t.error(err)
     setTimeout(() => {
       let gotEntry = 0
-      res.on('searchEntry', function (entry) {
+      res.on('searchEntry', function () {
         gotEntry++
       })
       res.on('error', function (err) {
         t.fail(err)
       })
-      res.on('end', function (res) {
+      res.on('end', function () {
         t.equal(gotEntry, 2)
         t.end()
       })
@@ -751,7 +751,7 @@ tap.test('search sizeLimit', function (t) {
     t.context.client.search('cn=sizelimit', { sizeLimit: limit }, function (err, res) {
       t2.error(err)
       let count = 0
-      res.on('searchEntry', function (entry) {
+      res.on('searchEntry', function () {
         count++
       })
       res.on('end', function () {
@@ -991,7 +991,7 @@ tap.test('search - sssvlv', { timeout: 10000 }, function (t) {
         count++
       })
       res.on('error', (err) => t2.error(err))
-      res.on('end', function (result) {
+      res.on('end', function () {
         t2.equals(count, 10)
         t2.end()
       })
@@ -1033,7 +1033,7 @@ tap.test('search - sssvlv', { timeout: 10000 }, function (t) {
         count++
       })
       res.on('error', (err) => t2.error(err))
-      res.on('end', function (result) {
+      res.on('end', function () {
         t2.equals(count, 10)
         t2.end()
       })
@@ -1048,7 +1048,7 @@ tap.test('search referral', function (t) {
     t.ok(res)
     let gotEntry = 0
     let gotReferral = false
-    res.on('searchEntry', function (entry) {
+    res.on('searchEntry', function () {
       gotEntry++
     })
     res.on('searchReference', function (referral) {
@@ -1261,7 +1261,7 @@ tap.test('setup action', function (t) {
     socketPath: t.context.socketPath
   })
   setupClient.on('setup', function (clt, cb) {
-    clt.bind(BIND_DN, BIND_PW, function (err, res) {
+    clt.bind(BIND_DN, BIND_PW, function (err) {
       t.error(err)
       cb(err)
     })
@@ -1283,7 +1283,7 @@ tap.test('setup reconnect', function (t) {
     reconnect: true
   })
   rClient.on('setup', function (clt, cb) {
-    clt.bind(BIND_DN, BIND_PW, function (err, res) {
+    clt.bind(BIND_DN, BIND_PW, function (err) {
       t.error(err)
       cb(err)
     })
@@ -1402,7 +1402,7 @@ tap.test('reconnect on server close', function (t) {
     reconnect: true
   })
   clt.on('setup', function (sclt, cb) {
-    sclt.bind(BIND_DN, BIND_PW, function (err, res) {
+    sclt.bind(BIND_DN, BIND_PW, function (err) {
       t.error(err)
       cb(err)
     })
@@ -1426,7 +1426,7 @@ tap.test('no auto-reconnect on unbind', function (t) {
     reconnect: true
   })
   clt.on('setup', function (sclt, cb) {
-    sclt.bind(BIND_DN, BIND_PW, function (err, res) {
+    sclt.bind(BIND_DN, BIND_PW, function (err) {
       t.error(err)
       cb(err)
     })
diff --git a/test/laundry.test.js b/test/laundry.test.js
index b55ddda..a16b448 100644
--- a/test/laundry.test.js
+++ b/test/laundry.test.js
@@ -34,7 +34,7 @@ tap.beforeEach((done, t) => {
     return next()
   })
 
-  server.search(suffix, function (req, res, next) {
+  server.search(suffix, function (req, res) {
     const entry = {
       dn: 'cn=foo, ' + suffix,
       attributes: {
diff --git a/test/server.test.js b/test/server.test.js
index 74c5c1b..c7de4a5 100644
--- a/test/server.test.js
+++ b/test/server.test.js
@@ -121,7 +121,7 @@ tap.test('route order', function (t) {
       vasync.forEachParallel({
         func: runSearch,
         inputs: [dnShort, dnMed, dnLong]
-      }, function (err, results) {
+      }, function (err) {
         t.error(err)
         client.unbind()
         server.close(() => t.end())
@@ -175,7 +175,7 @@ tap.test('route absent', function (t) {
           })
         }
       ]
-    }, function (err, result) {
+    }, function (err) {
       t.notOk(err)
       server.close(() => t.end())
     })