diff --git a/changelog.d/1097.misc b/changelog.d/1097.misc
new file mode 100644
index 000000000..8591129d8
--- /dev/null
+++ b/changelog.d/1097.misc
@@ -0,0 +1 @@
+Replace .indexOf with more specific methods
\ No newline at end of file
diff --git a/spec/integ/provisioning.spec.js b/spec/integ/provisioning.spec.js
index 17bb031ea..a3ed26ff7 100644
--- a/spec/integ/provisioning.spec.js
+++ b/spec/integ/provisioning.spec.js
@@ -96,7 +96,7 @@ describe("Provisioning API", function() {
                     if (content.status === "failure") {
                         env.isFailed.resolve();
                     }
-                    else if (content.status == "success") {
+                    else if (content.status === "success") {
                         env.isSuccess.resolve();
                     }
                 }
@@ -472,7 +472,7 @@ describe("Provisioning API", function() {
                         if (content.status === "failure") {
                             env.isFailed.resolve();
                         }
-                        else if (content.status == "success") {
+                        else if (content.status === "success") {
                             env.isSuccess.resolve();
                         }
                     }
diff --git a/spec/util/irc-client-mock.js b/spec/util/irc-client-mock.js
index 1c0ae9ba9..a4a63bc1d 100644
--- a/spec/util/irc-client-mock.js
+++ b/spec/util/irc-client-mock.js
@@ -226,7 +226,7 @@ module.exports._autoJoinChannels = function(addr, nick, channels) {
         channels = [channels];
     }
     module.exports._whenClient(addr, nick, "join", function(client, chan, cb) {
-        if (channels.indexOf(chan) != -1) {
+        if (channels.includes(chan)) {
             client.chans[chan] = {};
             client._invokeCallback(cb);
         }
@@ -244,7 +244,7 @@ module.exports._autoConnectNetworks = function(addr, nick, networks) {
         networks = [networks];
     }
     module.exports._whenClient(addr, nick, "connect", function(client, cb) {
-        if (networks.indexOf(client.addr) != -1) {
+        if (networks.includes(client.addr)) {
             client._invokeCallback(cb);
         }
     });
diff --git a/src/bridge/AdminRoomHandler.ts b/src/bridge/AdminRoomHandler.ts
index 04d34c50a..17f5e2ec3 100644
--- a/src/bridge/AdminRoomHandler.ts
+++ b/src/bridge/AdminRoomHandler.ts
@@ -171,7 +171,7 @@ export class AdminRoomHandler {
         const ircChannel = args[0];
         const key = args[1]; // keys can't have spaces in them, so we can just do this.
         let errText = null;
-        if (!ircChannel || ircChannel.indexOf("#") !== 0) {
+        if (!ircChannel || !ircChannel.startsWith("#")) {
             errText = "Format: '!join irc.example.com #channel [key]'";
         }
         else if (!server.canJoinRooms(sender)) {
diff --git a/src/bridge/IrcBridge.ts b/src/bridge/IrcBridge.ts
index 4bc0c35c2..28f776484 100644
--- a/src/bridge/IrcBridge.ts
+++ b/src/bridge/IrcBridge.ts
@@ -720,7 +720,7 @@ export class IrcBridge {
             else if (event.content.membership === "join") {
                 await this.matrixHandler.onJoin(request, event, target);
             }
-            else if (["ban", "leave"].indexOf(event.content.membership) !== -1) {
+            else if (["ban", "leave"].includes(event.content.membership)) {
                 // Given a "self-kick" is a leave, and you can't ban yourself,
                 // if the 2 IDs are different then we know it is either a kick
                 // or a ban (or a rescinded invite)
diff --git a/src/bridge/MemberListSyncer.ts b/src/bridge/MemberListSyncer.ts
index dcd3f3b4c..5f6da45b0 100644
--- a/src/bridge/MemberListSyncer.ts
+++ b/src/bridge/MemberListSyncer.ts
@@ -133,7 +133,7 @@ export class MemberListSyncer {
     // map irc channel to a list of room IDs. If all of those
     // room IDs have no real users in them, then part the bridge bot too.
     public async checkBotPartRoom(ircRoom: IrcRoom, req: BridgeRequest) {
-        if (ircRoom.channel.indexOf("#") !== 0) {
+        if (!ircRoom.channel.startsWith("#")) {
             return; // don't leave PM rooms
         }
         const matrixRooms = await this.ircBridge.getStore().getMatrixRoomsForChannel(
@@ -312,7 +312,7 @@ export class MemberListSyncer {
                 d.resolve();
                 return;
             }
-            if (entry.userId.indexOf("@-") === 0) {
+            if (entry.userId.startsWith("@-")) {
                 joinNextUser();
                 return;
             }
@@ -474,7 +474,7 @@ export class MemberListSyncer {
             if (server.claimsUserId(userId)) {
                 data.virtuals.push(userId);
             }
-            else if (userId.indexOf("@-") === 0) {
+            else if (userId.startsWith("@-")) {
                 // Ignore guest user IDs -- TODO: Do this properly by passing them through
             }
             else {
diff --git a/src/bridge/PublicitySyncer.ts b/src/bridge/PublicitySyncer.ts
index aaa592f03..54ecee34c 100644
--- a/src/bridge/PublicitySyncer.ts
+++ b/src/bridge/PublicitySyncer.ts
@@ -169,7 +169,7 @@ export class PublicitySyncer {
             }
 
             // Filter out already checked channels
-            channels = channels.filter((c) => checkedChannels.indexOf(c) === -1);
+            channels = channels.filter((c) => !checkedChannels.includes(c));
 
             const anyAreSecret = channels.some((channel) => {
                 let channelIsSecret = this.visibilityMap.channelIsSecret[channel];
diff --git a/src/datastore/NedbDataStore.ts b/src/datastore/NedbDataStore.ts
index bc5865395..44fe49736 100644
--- a/src/datastore/NedbDataStore.ts
+++ b/src/datastore/NedbDataStore.ts
@@ -309,7 +309,7 @@ export class NeDBDataStore implements DataStore {
                         return true;
                     }
                 }
-                return e.data && origin.indexOf(e.data.origin) !== -1;
+                return e.data && origin.includes(e.data.origin);
             });
         });
     }
diff --git a/src/irc/BridgedClient.ts b/src/irc/BridgedClient.ts
index ba53cbe26..24114590b 100644
--- a/src/irc/BridgedClient.ts
+++ b/src/irc/BridgedClient.ts
@@ -383,7 +383,7 @@ export class BridgedClient extends EventEmitter {
                     "err_erroneusnickname", "err_nonicknamegiven", "err_eventnickchange",
                     "err_nicktoofast", "err_unavailresource"
                 ];
-                if (failCodes.indexOf(err.command) !== -1) {
+                if (failCodes.includes(err.command)) {
                     this.log.error("Nick change error : %s", err.command);
                     clearTimeout(timeoutId);
                     if (nickListener) {
@@ -404,7 +404,7 @@ export class BridgedClient extends EventEmitter {
         if (!this.inst || this.inst.dead || !this.unsafeClient) {
             return Promise.resolve(); // we were never connected to the network.
         }
-        if (channel.indexOf("#") !== 0) {
+        if (!channel.startsWith("#")) {
             return Promise.resolve(); // PM room
         }
         if (!this.inChannel(channel)) {
@@ -430,11 +430,11 @@ export class BridgedClient extends EventEmitter {
         if (!this.inst || this.inst.dead || !this.unsafeClient) {
             return Promise.resolve(); // we were never connected to the network.
         }
-        if (Object.keys(this.unsafeClient.chans).indexOf(channel) === -1) {
+        if (!Object.keys(this.unsafeClient.chans).includes(channel)) {
             // we were never joined to it. We need to be joined to it to kick people.
             return Promise.resolve();
         }
-        if (channel.indexOf("#") !== 0) {
+        if (!channel.startsWith("#")) {
             return Promise.resolve(); // PM room
         }
 
@@ -832,10 +832,10 @@ export class BridgedClient extends EventEmitter {
             }
             return Bluebird.reject(new Error("No client"));
         }
-        if (Object.keys(this.unsafeClient.chans).indexOf(channel) !== -1) {
+        if (Object.keys(this.unsafeClient.chans).includes(channel)) {
             return Bluebird.resolve(new IrcRoom(this.server, channel));
         }
-        if (channel.indexOf("#") !== 0) {
+        if (!channel.startsWith("#")) {
             // PM room
             return Bluebird.resolve(new IrcRoom(this.server, channel));
         }
@@ -878,7 +878,7 @@ export class BridgedClient extends EventEmitter {
             // promise isn't resolved yet and we still want to join this channel
             if (defer.promise.isPending() && this._chanList.has(channel)) {
                 // we may have joined but didn't get the callback so check the client
-                if (Object.keys(this.unsafeClient.chans).indexOf(channel) !== -1) {
+                if (Object.keys(this.unsafeClient.chans).includes(channel)) {
                     // we're joined
                     this.log.debug("Timed out joining %s - didn't get callback but " +
                         "are now joined. Resolving.", channel);
diff --git a/src/irc/ConnectionInstance.ts b/src/irc/ConnectionInstance.ts
index e9bd7cfb5..2ce6ab993 100644
--- a/src/irc/ConnectionInstance.ts
+++ b/src/irc/ConnectionInstance.ts
@@ -211,7 +211,7 @@ export class ConnectionInstance {
                 "err_umodeunknownflag", "err_nononreg"
             ];
             if (err && err.command) {
-                if (failCodes.indexOf(err.command) !== -1) {
+                if (failCodes.includes(err.command)) {
                     return; // don't disconnect for these error codes.
                 }
             }
@@ -262,7 +262,7 @@ export class ConnectionInstance {
 
                 let errText = ("" + msg.args[0]) || "";
                 errText = errText.toLowerCase();
-                wasThrottled = errText.indexOf("throttl") !== -1;
+                wasThrottled = errText.includes("throttl");
 
                 if (wasThrottled) {
                     this.disconnect("throttled").catch(logError);
diff --git a/src/irc/IdentGenerator.ts b/src/irc/IdentGenerator.ts
index 65a429f95..5198edf03 100644
--- a/src/irc/IdentGenerator.ts
+++ b/src/irc/IdentGenerator.ts
@@ -161,7 +161,7 @@ export class IdentGenerator {
         */
         const delim = "_";
         const modifyUsername = () => {
-            if (uname.indexOf(delim) === -1) {
+            if (!uname.includes(delim)) {
                 uname = uname.substring(0, uname.length - 2) + delim + "1";
                 return true;
             }
@@ -174,7 +174,7 @@ export class IdentGenerator {
             else {
                 uname = segments[0] + delim + num;
             }
-            return uname.indexOf(delim) !== 0; // break out if '~10000'
+            return !uname.startsWith(delim); // break out if '~10000'
         }
 
         // TODO: This isn't efficient currently; since this will be called worst
diff --git a/src/irc/IrcEventBroker.ts b/src/irc/IrcEventBroker.ts
index 288c0eb26..9ee33f537 100644
--- a/src/irc/IrcEventBroker.ts
+++ b/src/irc/IrcEventBroker.ts
@@ -244,7 +244,7 @@ export class IrcEventBroker {
             // listen for PMs for clients. If you listen for rooms, you'll get
             // duplicates since the bot will also invoke the callback fn!
         connInst.addListener("message", (from: string, to: string, text: string) => {
-            if (to.indexOf("#") === 0) { return; }
+            if (to.startsWith("#")) { return; }
             const req = createRequest();
             complete(req, ircHandler.onPrivateMessage(
                 req,
@@ -253,7 +253,7 @@ export class IrcEventBroker {
             ));
         });
         connInst.addListener("notice", (from: string, to: string, text: string) => {
-            if (!from || to.indexOf("#") === 0) { return; }
+            if (!from || to.startsWith("#")) { return; }
             const req = createRequest();
             complete(req, ircHandler.onPrivateMessage(
                 req,
@@ -262,8 +262,8 @@ export class IrcEventBroker {
             ));
         });
         connInst.addListener("ctcp-privmsg", (from: string, to: string, text: string) => {
-            if (to.indexOf("#") === 0) { return; }
-            if (text.indexOf("ACTION ") === 0) {
+            if (to.startsWith("#")) { return; }
+            if (text.startsWith("ACTION ")) {
                 const req = createRequest();
                 complete(req, ircHandler.onPrivateMessage(
                     req,
@@ -430,7 +430,7 @@ export class IrcEventBroker {
             ));
         });
         this.hookIfClaimed(client, connInst, "message", (from: string, to: string, text: string) => {
-            if (to.indexOf("#") !== 0) { return; }
+            if (!to.startsWith("#")) { return; }
             const req = createRequest();
             this.bufferRequestToChannel(to, () => {
                 return complete(req, ircHandler.onMessage(
@@ -440,8 +440,8 @@ export class IrcEventBroker {
             }, req);
         });
         this.hookIfClaimed(client, connInst, "ctcp-privmsg", function(from: string, to: string, text: string) {
-            if (to.indexOf("#") !== 0) { return; }
-            if (text.indexOf("ACTION ") === 0) {
+            if (!to.startsWith("#")) { return; }
+            if (text.startsWith("ACTION ")) {
                 const req = createRequest();
                 complete(req, ircHandler.onMessage(
                     req, server, createUser(from), to,
@@ -450,7 +450,7 @@ export class IrcEventBroker {
             }
         });
         this.hookIfClaimed(client, connInst, "notice", (from: string, to: string, text: string) => {
-            if (to.indexOf("#") !== 0) { return; }
+            if (!to.startsWith("#")) { return; }
             if (!from) { // ignore server notices
                 return;
             }
@@ -462,9 +462,9 @@ export class IrcEventBroker {
             }, req);
         });
         this.hookIfClaimed(client, connInst, "topic", function(channel: string, topic: string, nick: string) {
-            if (channel.indexOf("#") !== 0) { return; }
+            if (!channel.startsWith("#")) { return; }
 
-            if (nick && nick.indexOf("@") !== -1) {
+            if (nick && nick.includes("@")) {
                 const match = nick.match(
                     // https://github.com/martynsmith/node-irc/blob/master/lib/parse_message.js#L26
                     /^([_a-zA-Z0-9\[\]\\`^{}|-]*)(!([^@]+)@(.*))?$/
diff --git a/src/irc/IrcServer.ts b/src/irc/IrcServer.ts
index 6db6a5b97..d2251c14b 100644
--- a/src/irc/IrcServer.ts
+++ b/src/irc/IrcServer.ts
@@ -222,7 +222,7 @@ export class IrcServer {
     }
 
     public isInWhitelist(userId: string) {
-        return this.config.dynamicChannels.whitelist.indexOf(userId) !== -1;
+        return this.config.dynamicChannels.whitelist.includes(userId);
     }
 
     public getCA() {
@@ -297,7 +297,7 @@ export class IrcServer {
     }
 
     public isExcludedChannel(channel: string) {
-        return this.config.dynamicChannels.exclude.indexOf(channel) !== -1;
+        return this.config.dynamicChannels.exclude.includes(channel);
     }
 
     public isExcludedUser(userId: string) {
@@ -342,7 +342,7 @@ export class IrcServer {
     }
 
     private shouldSyncMembership(kind: MembershipSyncKind, identifier: string|undefined, toIrc: boolean) {
-        if (["incremental", "initial"].indexOf(kind) === -1) {
+        if (!["incremental", "initial"].includes(kind)) {
             throw new Error("Bad kind: " + kind);
         }
         if (!this.config.membershipLists.enabled) {
diff --git a/src/irc/formatting.ts b/src/irc/formatting.ts
index c04a107f6..a15c93a0a 100644
--- a/src/irc/formatting.ts
+++ b/src/irc/formatting.ts
@@ -107,7 +107,7 @@ export function htmlTag(state: StyleState, name: string, open?: boolean): string
     let text = '';
 
     if (typeof open === 'undefined') {
-        open = (state.history.indexOf(name) === -1);
+        open = !state.history.includes(name);
     }
 
     if (open) {
@@ -205,7 +205,7 @@ export function htmlToIrc(html?: string): string|null {
     let replacement;
     for (let i = 0; i < cleanHtml.length; i++) {
         const ch = cleanHtml[i];
-        if (STYLE_CODES.indexOf(ch) >= 0) {
+        if (STYLE_CODES.includes(ch)) {
             openStyleCodes.push(ch);
         }
         else if (ch === "<") {
diff --git a/src/models/IrcAction.ts b/src/models/IrcAction.ts
index e90bab449..05872a6e6 100644
--- a/src/models/IrcAction.ts
+++ b/src/models/IrcAction.ts
@@ -28,7 +28,7 @@ export class IrcAction {
         public readonly type: IrcActionType,
         public text: string,
         public readonly ts: number = 0 ) {
-        if (ACTION_TYPES.indexOf(type) === -1) {
+        if (!ACTION_TYPES.includes(type)) {
             throw new Error("Unknown IrcAction type: " + type);
         }
     }
diff --git a/src/models/IrcRoom.ts b/src/models/IrcRoom.ts
index 52539091a..128729864 100644
--- a/src/models/IrcRoom.ts
+++ b/src/models/IrcRoom.ts
@@ -30,7 +30,7 @@ export class IrcRoom extends RemoteRoom {
         super(IrcRoom.createId(server, toIrcLowerCase(channel)), {
             domain: server.domain,
             channel: toIrcLowerCase(channel),
-            type: channel.indexOf("#") === 0 ? "channel" : "pm"
+            type: channel.startsWith("#") ? "channel" : "pm"
         });
         if (!server || !channel) {
             throw new Error("Server and channel are required.");
diff --git a/src/models/MatrixAction.ts b/src/models/MatrixAction.ts
index f214cd409..769271296 100644
--- a/src/models/MatrixAction.ts
+++ b/src/models/MatrixAction.ts
@@ -85,7 +85,7 @@ export class MatrixAction {
         public htmlText: string|null = null,
         public readonly ts: number = 0
         ) {
-        if (ACTION_TYPES.indexOf(type) === -1) {
+        if (!ACTION_TYPES.includes(type)) {
             throw new Error("Unknown MatrixAction type: " + type);
         }
     }
diff --git a/src/provisioning/Provisioner.ts b/src/provisioning/Provisioner.ts
index fdb8e0d84..536166330 100644
--- a/src/provisioning/Provisioner.ts
+++ b/src/provisioning/Provisioner.ts
@@ -347,11 +347,11 @@ export class Provisioner {
 
         const info = await botClient.getOperators(ircChannel, {key : key});
 
-        if (info.nicks.indexOf(opNick) === -1) {
+        if (!info.nicks.includes(opNick)) {
             throw new Error(`Provided user is not in channel ${ircChannel}.`);
         }
 
-        if (info.operatorNicks.indexOf(opNick) === -1) {
+        if (!info.operatorNicks.includes(opNick)) {
             throw new Error(`Provided user is not an op of ${ircChannel}.`);
         }