diff --git a/TODO.md b/TODO.md
index 5871eee2bf..aa1893f5fc 100644
--- a/TODO.md
+++ b/TODO.md
@@ -5,6 +5,8 @@
 * [`return_buffers`](https://github.com/NodeRedis/node-redis#options-object-properties) (? supported in v3, but have performance drawbacks)
 * ~~Support options in a command function (`.get`, `.set`, ...)~~
 * Key prefixing (?) (partially supported in v3)
+* Support for RESP3
+* client-side caching
 
 ## Client
 * ~~Blocking Commands~~
diff --git a/lib/client.spec.ts b/lib/client.spec.ts
index 30daf03a86..1774c6ba22 100644
--- a/lib/client.spec.ts
+++ b/lib/client.spec.ts
@@ -33,20 +33,18 @@ describe('Client', () => {
         });
     });
 
-    describe('callbackify', () => {
+    describe('legacyMode', () => {
         const client = RedisClient.create({
             socket: TEST_REDIS_SERVERS[TestRedisServers.OPEN],
-            callbackify: true
+            legacyMode: true
         });
 
         before(() => client.connect());
-        after(async () => {
-            await (client as any).flushAllAsync();
-            await client.disconnect();
-        });
+        afterEach(() => client.modern.flushAll());
+        after(() => client.disconnect());
 
-        it('client.{command} should call the callback', done => {
-            (client as any).ping((err: Error, reply: string) => {
+        it('client.sendCommand should call the callback', done => {
+            (client as any).sendCommand('PING', (err?: Error, reply?: string) => {
                 if (err) {
                     return done(err);
                 }
@@ -60,17 +58,95 @@ describe('Client', () => {
             });
         });
 
-        it('client.{command} should work without callback', async () => {
-            (client as any).ping();
-            await (client as any).pingAsync(); // make sure the first command was replied
+        it('client.sendCommand should work without callback', async () => {
+            (client as any).sendCommand('PING');
+            await client.modern.ping(); // make sure the first command was replied
         });
 
-        it('client.{command}Async should return a promise', async () => {
+        it('client.modern.sendCommand should return a promise', async () => {
             assert.equal(
-                await (client as any).pingAsync(),
+                await client.modern.sendCommand(['PING']),
                 'PONG'
             );
         });
+
+        it('client.{command} should accept vardict arguments', done => {
+            (client as any).set('a', 'b', (err?: Error, reply?: string) => {
+                if (err) {
+                    return done(err);
+                }
+
+                try {
+                    assert.equal(reply, 'OK');
+                    done();
+                } catch (err) {
+                    done(err);
+                }
+            });
+        });
+
+        it('client.{command} should accept arguments array', done => {
+            (client as any).set(['a', 'b'], (err?: Error, reply?: string) => {
+                if (err) {
+                    return done(err);
+                }
+
+                try {
+                    assert.equal(reply, 'OK');
+                    done();
+                } catch (err) {
+                    done(err);
+                }
+            });
+        });
+
+        it('client.{command} should accept mix of strings and array of strings', done => {
+            (client as any).set(['a'], 'b', ['GET'], (err?: Error, reply?: string) => {
+                if (err) {
+                    return done(err);
+                }
+
+                try {
+                    assert.equal(reply, null);
+                    done();
+                } catch (err) {
+                    done(err);
+                }
+            });
+        });
+
+        it('client.multi.exec should call the callback', done => {
+            (client as any).multi()
+                .ping()
+                .exec((err?: Error, reply?: string) => {
+                    if (err) {
+                        return done(err);
+                    }
+
+                    try {
+                        assert.deepEqual(reply, ['PONG']);
+                        done();
+                    } catch (err) {
+                        done(err);
+                    }
+                });
+        });
+
+        it('client.multi.exec should work without callback', async () => {
+            (client as any).multi()
+                .ping()
+                .exec();
+            await client.modern.ping(); // make sure the first command was replied
+        });
+
+        it('client.modern.exec should return a promise', async () => {
+            assert.deepEqual(
+                await ((client as any).multi().modern
+                    .ping()
+                    .exec()),
+                ['PONG']
+            );
+        });
     });
 
     describe('events', () => {
diff --git a/lib/client.ts b/lib/client.ts
index 2df4cda01f..acf06560b0 100644
--- a/lib/client.ts
+++ b/lib/client.ts
@@ -13,7 +13,7 @@ export interface RedisClientOptions<M = RedisModules, S = RedisLuaScripts> {
     scripts?: S;
     commandsQueueMaxLength?: number;
     readOnly?: boolean;
-    callbackify?: boolean;
+    legacyMode?: boolean;
 }
 
 export type RedisCommandSignature<C extends RedisCommand> =
@@ -50,24 +50,6 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         };
     }
 
-    static callbackifyCommand(on: any, name: string): void {
-        const originalFunction = on[name + 'Async'] = on[name];
-        on[name] = function (...args: Array<unknown>) {
-            const hasCallback = typeof args[args.length - 1] === 'function',
-                callback = (hasCallback && args.pop()) as Function;
-
-            const promise = originalFunction.apply(this, args);
-            if (hasCallback) {
-                promise
-                    .then((reply: RedisReply) => callback(null, reply))
-                    .catch((err: Error) => callback(err));
-            } else {
-                promise
-                    .catch((err: Error) => this.emit('error', err));
-            }
-        };
-    }
-
     static create<M extends RedisModules, S extends RedisLuaScripts>(options?: RedisClientOptions<M, S>): RedisClientType<M, S> {
         return <any>new RedisClient<M, S>(options);
     }
@@ -80,6 +62,7 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
     readonly #socket: RedisSocket;
     readonly #queue: RedisCommandsQueue;
     readonly #Multi: typeof RedisMultiCommand & { new(): RedisMultiCommandType<M, S> };
+    readonly #modern: Record<string, Function> = {};
     #selectedDB = 0;
 
     get options(): RedisClientOptions<M> | null | undefined {
@@ -90,6 +73,14 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         return this.#socket.isOpen;
     }
 
+    get modern(): Record<string, Function> {
+        if (!this.#options?.legacyMode) {
+            throw new Error('the client is not in "legacy mode"');
+        }
+
+        return this.#modern;
+    }
+
     constructor(options?: RedisClientOptions<M, S>) {
         super();
         this.#options = options;
@@ -98,7 +89,7 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         this.#Multi = this.#initiateMulti();
         this.#initiateModules();
         this.#initiateScripts();
-        this.#callbackify();
+        this.#legacyMode();
     }
 
     #initiateSocket(): RedisSocket {
@@ -159,7 +150,7 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         const options = this.#options;
         return <any>class extends RedisMultiCommand {
             constructor() {
-                super(executor, options?.modules, options?.scripts);
+                super(executor, options);
             }
         };
     }
@@ -203,22 +194,61 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         }
     }
 
-    #callbackify(): void {
-        if (!this.#options?.callbackify) return;
+    #legacyMode(): void {
+        if (!this.#options?.legacyMode) return;
+
+        this.#modern.sendCommand = this.sendCommand.bind(this);
+
+        (this as any).sendCommand = (...args: Array<unknown>): void => {
+            const options = isCommandOptions(args[0]) && args.shift(),
+                callback = typeof args[args.length - 1] === 'function' && (args.pop() as Function);
+            
+            this.#modern.sendCommand(args.flat(), options)
+                .then((reply: unknown) => {
+                    if (!callback) return;
+
+                    // https://github.com/NodeRedis/node-redis#commands:~:text=minimal%20parsing
+
+                    callback(null, reply);
+                })
+                .catch((err: Error) => {
+                    if (!callback) {
+                        this.emit('error', err);
+                        return;
+                    }
+
+                    callback(err);
+                })
+        }
 
         for (const name of Object.keys(COMMANDS)) {
-            RedisClient.callbackifyCommand(this, name);
-            RedisClient.callbackifyCommand(this.#Multi.prototype, name);
+            this.#defineLegacyCommand(name);
         }
 
-        if (!this.#options?.modules) return;
+        // hard coded commands
+        this.#defineLegacyCommand('SELECT');
+        this.#defineLegacyCommand('select');
 
-        for (const m of this.#options.modules) {
-            for (const name of Object.keys(m)) {
-                RedisClient.callbackifyCommand(this, name);
-                RedisClient.callbackifyCommand(this.#Multi.prototype, name);
+        if (this.#options?.modules) {
+            for (const m of this.#options.modules) {
+                for (const name of Object.keys(m)) {
+                    this.#defineLegacyCommand(name);
+                }
             }
         }
+
+        if (this.#options?.scripts) {
+            for (const name of Object.keys(this.#options.scripts)) {
+                this.#defineLegacyCommand(name);
+            }
+        }
+    }
+
+    #defineLegacyCommand(name: string): void {
+        this.#modern[name] = (this as any)[name];
+        (this as any)[name] = function (...args: Array<unknown>): void {
+            this.sendCommand(name, ...args);
+        };
     }
 
     duplicate(): RedisClientType<M, S> {
diff --git a/lib/multi-command.ts b/lib/multi-command.ts
index 045bd24fb5..bf18edfcdb 100644
--- a/lib/multi-command.ts
+++ b/lib/multi-command.ts
@@ -2,6 +2,7 @@ import COMMANDS from './commands/client';
 import { RedisCommand, RedisModules, RedisReply } from './commands';
 import RedisCommandsQueue from './commands-queue';
 import { RedisLuaScript, RedisLuaScripts } from './lua-script';
+import { RedisClientOptions } from './client';
 
 type RedisMultiCommandSignature<C extends RedisCommand, M extends RedisModules, S extends RedisLuaScripts> = (...args: Parameters<C['transformArguments']>) => RedisMultiCommandType<M, S>;
 
@@ -29,71 +30,136 @@ export type RedisMultiExecutor = (queue: Array<MultiQueuedCommand>, chainId: Sym
 export default class RedisMultiCommand<M extends RedisModules = RedisModules, S extends RedisLuaScripts = RedisLuaScripts> {
     static defineCommand(on: any, name: string, command: RedisCommand): void {
         on[name] = function (...args: Parameters<typeof command.transformArguments>) {
-            return this.addCommand(command.transformArguments(...args), command.transformReply);
+            // do not return `this.addCommand` directly cause in legacy mode it's binded to the legacy version 
+            this.addCommand(command.transformArguments(...args), command.transformReply);
+            return this;
         };
     }
 
-    static defineLuaScript(on: any, name: string, script: RedisLuaScript): void {
-        on[name] = function (...args: Array<unknown>) {
-            let evalArgs;
-            if (this.#scriptsInUse.has(name)) {
-                evalArgs = [
-                    'EVALSHA',
-                    script.SHA
-                ];
-            } else {
-                this.#scriptsInUse.add(name);
-                evalArgs = [
-                    'EVAL',
-                    script.SCRIPT
-                ];
-            }
-
-            return this.addCommand(
-                [
-                    ...evalArgs,
-                    script.NUMBER_OF_KEYS,
-                    ...script.transformArguments(...args)
-                ],
-                script.transformReply
-            );
-        };
-    }
-
-    static create<M extends RedisModules, S extends RedisLuaScripts>(executor: RedisMultiExecutor, modules?: M, scripts?: S): RedisMultiCommandType<M, S> {
-        return <any>new RedisMultiCommand<M, S>(executor, modules, scripts);
+    static create<M extends RedisModules, S extends RedisLuaScripts>(executor: RedisMultiExecutor, clientOptions?: RedisClientOptions<M, S>): RedisMultiCommandType<M, S> {
+        return <any>new RedisMultiCommand<M, S>(executor, clientOptions);
     }
 
     readonly #executor: RedisMultiExecutor;
 
+    readonly #clientOptions: RedisClientOptions<M, S> | undefined;
+
     readonly #queue: Array<MultiQueuedCommand> = [];
 
     readonly #scriptsInUse = new Set<string>();
 
-    constructor(executor: RedisMultiExecutor, modules?: RedisModules, scripts?: RedisLuaScripts) {
-        this.#executor = executor;
-        this.#initiateModules(modules);
-        this.#initiateScripts(scripts);
+    readonly #modern: Record<string, Function> = {};
+
+    get modern(): Record<string, Function> {
+        if (!this.#clientOptions?.legacyMode) {
+            throw new Error('client is not in "legacy mode"');
+        }
+
+        return this.#modern;
     }
 
-    #initiateModules(modules?: RedisModules): void {
-        if (!modules) return;
+    constructor(executor: RedisMultiExecutor, clientOptions?: RedisClientOptions<M, S>) {
+        this.#executor = executor;
+        this.#clientOptions = clientOptions;
+        this.#initiateModules();
+        this.#initiateScripts();
+        this.#legacyMode();
+    }
 
-        for (const m of modules) {
+    #initiateModules(): void {
+        if (!this.#clientOptions?.modules) return;
+
+        for (const m of this.#clientOptions.modules) {
             for (const [name, command] of Object.entries(m)) {
                 RedisMultiCommand.defineCommand(this, name, command);
             }
         }
     }
 
-    #initiateScripts(scripts?: RedisLuaScripts): void {
-        if (!scripts) return;
+    #initiateScripts(): void {
+        if (!this.#clientOptions?.scripts) return;
 
-        for (const [name, script] of Object.entries(scripts)) {
-            RedisMultiCommand.defineLuaScript(this, name, script);
+        for (const [name, script] of Object.entries(this.#clientOptions.scripts)) {
+            (this as any)[name] = function (...args: Array<unknown>) {
+                let evalArgs;
+                if (this.#scriptsInUse.has(name)) {
+                    evalArgs = [
+                        'EVALSHA',
+                        script.SHA
+                    ];
+                } else {
+                    this.#scriptsInUse.add(name);
+                    evalArgs = [
+                        'EVAL',
+                        script.SCRIPT
+                    ];
+                }
+    
+                return this.addCommand(
+                    [
+                        ...evalArgs,
+                        script.NUMBER_OF_KEYS,
+                        ...script.transformArguments(...args)
+                    ],
+                    script.transformReply
+                );
+            };
         }
     }
 
+    #legacyMode(): Record<string, Function> | undefined {
+        if (!this.#clientOptions?.legacyMode) return;
+
+        this.#modern.exec = this.exec.bind(this);
+        this.#modern.addCommand = this.addCommand.bind(this);
+
+        (this as any).exec = function (...args: Array<unknown>): void {
+            const callback = typeof args[args.length - 1] === 'function' && args.pop() as Function;
+            this.#modern.exec()
+                .then((reply: unknown) => {
+                    if (!callback) return;
+
+                    callback(null, reply);
+                })
+                .catch((err: Error) => {
+                    if (!callback) {
+                        // this.emit('error', err);
+                        return;
+                    }
+
+                    callback(err);
+                });
+        };
+
+
+        for (const name of Object.keys(COMMANDS)) {
+            this.#defineLegacyCommand(name);
+        }
+
+        if (this.#clientOptions.modules) {
+            for (const m of this.#clientOptions.modules) {
+                for (const name of Object.keys(m)) {
+                    this.#defineLegacyCommand(name);
+                }
+            }
+        }
+
+        if (this.#clientOptions.scripts) {
+            for (const name of Object.keys(this.#clientOptions.scripts)) {
+                this.#defineLegacyCommand(name);
+            }
+        }
+    }
+
+    #defineLegacyCommand(name: string): void {
+        this.#modern[name] = (this as any)[name];
+
+        // TODO: https://github.com/NodeRedis/node-redis#commands:~:text=minimal%20parsing
+        (this as any)[name] = function (...args: Array<unknown>) {
+            return this.addCommand([name, ...args.flat()]);
+        };
+    }
+
     addCommand(args: Array<string>, transformReply?: RedisCommand['transformReply']): this {
         this.#queue.push({
             encodedCommand: RedisCommandsQueue.encodeCommand(args),