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</html>";s:4:"text";s:32988:"The util.debuglog().enabled getter is used to create a test that can be used The primitive can be used to clear the Timeout.The primitive can only be used in the same thread where the timeout was created. Equivalent to a transpilation tool was used. ', // Emits a deprecation warning with code DEP0001, // Does not emit a deprecation warning because it has the same code, // Returns 'See object { foo: 42 }', where `42` is colored as a number, // b: <ref *2> { inner: [Circular *2], obj: [Circular *1] }, 'Lorem ipsum dolor sit amet,\nconsectetur adipiscing elit, sed do ', 'eiusmod \ntempor incididunt ut labore et dolore magna aliqua. Due to its evolution from ES5 to ES6 stack, Typescript has become one of the most de facto solutions. This book will help you leverage microservices’ power to build robust architecture using reactive programming and Typescript in Node.js. In the new node 10.x LTS release it looks like there is now and experimental promise api of the file system module, so it is evident that eventually one will not even need to bother with this any more as well, and out of the box file system methods will work just like that of what I have come to know when using fs-extra. Returns true if the value is any boxed primitive object, e.g. The Hacker Noon Newsletter. Different Node.js build configurations support different sets of encodings. Pablo Portillo May 24, 2021. You should use the Node.js utility function util.promisify to turn error-first callback-style functions into awaitable functions. Returns true if the given object is an Array. In the callback, the The %o specifier's depth has default depth of 4 again. instances of TextEncoder only support UTF-8 encoding. Returns true if the given object is a Number. We will use the Node.js implementation of Redlock, the algorithm to have distributed locks with Redis. Returns true if the given object is a RegExp. require ('util.promisify/shim')(); // `util.promisify` is now defined const util = require ('util'); // Use `util.promisify` Note: this package requires a native ES5 environment, and for Promise to be globally available. util.promisify () in action #. The default styles and associated colors are: Color styling uses ANSI control codes that may not be supported on all In the example below, any unhandled exceptions thrown during the function execution only fail the individual invocation that raised an exception. The API is accessible via require('util').types or require('util/types'). If not, then the returned function is a no-op. which util.inspect() will invoke and use the result of when inspecting util.inspect(). frontend.killProcess(`node -e process.once('exit', _ => console.log(42))`); detailedResults = /[/\\]detailed-results-/.test(file); 'body /deep/ .list-item /deep/ [aria-label=Run]', 'body /deep/ .console-message-wrapper:nth-child(3) .console-message-text'. Interface. Such objects are created either by Node.js internals or native // When the Promise was rejected with `null` it is wrapped with an Error and. If either the --no-deprecation or --no-warnings command-line flags are There are a couple bits missing from the core node.js filesystem. writes debug messages to stderr based on the existence of the NODE_DEBUG created When called, util.deprecate() will return a function that will emit a See Common System Errors for the names of common errors. terminals. work as expected unless handled specially: Using the util.promisify.custom symbol one can override the return value of Inherit the prototype methods from one constructor into another. // Promisifies readline.question function using node native `util.promisify` // readline.question takes one callback that returns the answer, so it need custom promisifying: const readline = require ('readline'); const {promisify } = require ('util'); readline. Getting started To follow this tutorial you should have the basic fundamentals of using command line. Basically, i want to see how we structure node js api. [f206505e9d] - util: fix instanceof checks with null prototypes during inspection (Ruben Bridgewater) #36178 [2f7944b18b] - util: fix module prefixes during inspection (Ruben Bridgewater) #36178; 2021-01-04, Version 14.15.4 'Fermium' (LTS), @BethGriggs. const fs = require ('fs') // Use promisify to convert callback. I find it easier (and more intuitive) to use async/await than to use callbacks. Returns true if the value is a generator function. The following APIs are deprecated and should no longer be used. To convert a callback into a promise, you need to return a promise. The maxArrayLength option is supported now; in particular, long arrays are truncated by default. emitting a warning. The use of mkdirp will return a promise because of the use of the util promisify method, so if all goes well with creating the path I wil then also write the file with the given data. supported encodings or an alias. @#$%")', 'body /deep/ .console-message-wrapper:nth-child(6) .console-message-text'. There are four different ways to create a child process in Node: spawn(), fork(), exec(), and execFile(). be truncated. Also note thrown. For doing that there is a handy util.promisify(original) function might be utilized. You need to write your own promise. Final notes. Decodes the input and returns a string. Promises in Node.js 8.x Core. const promisify = require ('util.promisify'); // Use `promisify` just like the built-in method on `util` Shim. The constructor parameter can refer to an ES6 class now. We will create a simple server with API which returns the books data and allow us to create, update and delete books. Gotcha #2: Binding Instances. For example, with a function that takes in symbol is registered globally and can be Found inside – Page 39For example, if you want to format a string using a printf-like format, ... Well, then there's this: const newStat = util.promisify(fs.stat); Now, ... If the --trace-deprecation or --trace-warnings command-line flags are set, Node.js Reference Built-in Modules. Node.js at Scale is a collection of articles focusing on the needs of companies with bigger Node.js installations and advanced Node developers. Please use the ES6 class and extends keywords to get language level inheritance support. If your Node.js applications are already using Promises, then you only have to start awaiting your Promises, instead of chaining them.. const http = require ('http'); const {promisify } = require ('util'); function makeDeferred {let resolve; let reject; const promise = new Promise ((res, rej) => {resolve = res; reject = rej;}); return {resolve, reject, promise};} http. Found inside – Page 58In the previous section, we discussed util.promisify and its ability to ... As we see in these examples, the Promise is handled very nicely within an async ... specifiers. This does not include ArrayBuffer instances. by new String(). with a different function that doesn't have any initialization or projet3 gtfs-react-graphql Build React and React … Found inside – Page 316In fact, this function is part of the util core module and can be imported as follows: import * as util from "util"; const promisify = util.promisify; ... Predefined control codes are listed below (grouped as "Modifiers", "Foreground properties. Found insidePurchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications. About the Book You've decided to use Node.js for your next project and you need the skills to implement Node in production. desirable to test for both; See util.types.isAnyArrayBuffer() for that. In my case, that’s getChuckNorrisFact. In this hands-on guide, author Ethan Brown teaches you the fundamentals through the development of a fictional application that exposes a public website and a RESTful API. // util.promisify () methods. It is Take a look at traditional example: 1. Found insideAbout the book TypeScript Quickly teaches you to exploit the benefits of types in browser-based and standalone applications. In this article, you can learn how to use node_redis, a community recommended Redis client for Node.js.. I want to see what do we put in service, contollers or routes, maybe add some logging as well. The callback is executed asynchronously, and will have a limited stack trace. Paused and flowing modes of a readable stream5. stack trace are printed to stderr the first time the deprecated function is The Microsoft Official Academic Course (MOAC) textbook for Security Fundamentals Exam 98-367 2nd Edition is focused primarily on the installation, storage and compute features and their functionality that is available within Windows Server ... In this tutorial we will create a simple REST API using the Node and Hapi framework. false. Final notes. Run-time JS coding errors should not cause node.js to exit silently. That means retrieving the same Tutorials, references, and examples are constantly reviewed to avoid … These functions take string arguments, the first of which is almost always the Redis key to run the command against. addons. not inspect properties of the object that are accessible from JavaScript (like Many of the Returns true if the value is a boolean object, e.g. is wrapped in an Error with the original value stored in a field named Found inside – Page 478This is actually a great example of the power of TypeScript. We can write and build our code on a modern version but target a legacy runtime. will throw an error. If the section name appears within the value of that environment variable, Ryan Dahl, creator of Node.js: "This is an amazing introduction to Node.js".The aim of The Node Beginner Book is to get you started with developing applications for Node.js, teaching you everything you need to know about advanced JavaScript ... Instances of the readline.Interface class are constructed using the readline.createInterface() method (note that the class and the constructor do not have the same name). UTF-8 encodes the input string and returns a Uint8Array containing the false. However if you are using node 8.x or later than there is a promisify method in the util module, and if that is the only additional Promise related feature that you care about, then you may not need to bother with an additional dependency. Returns true if the value is a built-in ArrayBuffer instance. colors", and "Background colors"). I want to see what do we put in service, contollers or routes, maybe add some logging as well. In addition to being accessible through util.inspect.custom, this From standard inbuilt modules to … Combining recursion and composition. Update 06/11/2021: As Mike Robinson pointed out in the comment, an alternative approach is to use the mysql2 package, which supports async operations out of the box.It works very similar to the examples above, but the wrapper using promisify() is no longer necessary. the warning will be emitted only once for that code. It is util.promisify. exec(command, (error, stdout, stderr... If options.stream is true, any one or more aliases may be used. Returns true if the value is a string object, e.g. Node.js 8: `util.promisify()`, fs.write. Can be 'text', 'json' or 'buffer'.. Supported specifiers are: If a specifier does not have a corresponding argument, it is not replaced: Values that are not part of the format string are formatted using an identifiable tag for an inspected value. If textDecoder.fatal is true, decoding errors that occur will result in a accessed in any environment as Symbol.for('nodejs.util.inspect.custom'). If this program is run with NODE_DEBUG=foo in the environment, then it will Returns true if the value is a native External value. See Custom inspection functions on Objects for more details. in particular, the return value may not match the original source code if (foo, onSuccessCallback, onErrorCallback): If promisify.custom is defined but is not a function, promisify() will Node.js TypeScript #3. Otherwise, returns If you hand the path of a file to the following script, it prints its contents. In versions of node before that of 8.x if I wanted to make a node js method return a promise rather than having to deal with callbacks I would have to use some kind of user land module to promisify that method, do so manually with the Promise constructor, or use a dependency that does so out of the box such as with fs-extra for example. Returns true if the given object is a Date. Otherwise, returns false. Node.js 8.0.0 includes a new util.promisify() API that allows standard Node.js callback style APIs to be wrapped in a function that returns a Promise. ; msg <string> A warning message to display when the deprecated function is invoked. Returns true if the value is a built-in Date instance. Returns true if the value is an instance of one of the ArrayBuffer When that initial bit of JavaScript has finished running and control returns back to the native layer, Node.js drains the nextTick and microtask queues — in that order. Usually, it is Also note that the two styles are semantically incompatible.. constructor <Function>; superConstructor <Function>; Inherit the prototype methods from one constructor into another. Using promisify you can use the node.js file system utilities with async/await and promises.. Its just added to the event stack at … The class is now available on the global object. All you have to do is use the callback function as an argument to util.promisify, and store it an a variable. through the constructor.super_ property. Promisified node.js file system utilities. reason. taking Returns true if the given object is a Function. incomplete byte sequences occurring at the end of the input are buffered To try this example on your PC you only need to install Docker Desktop and Node.js then follow the described steps. The node command is the main Node JS executable and is one of three major binaries included with Node JS. For example, you can pick a product category or a search result page from amazon as an entry, and crawl it to scrape all the product details, and limit it to the first 10 pages with the suggested products as well. About the Book Angular Development with TypeScript, Second Edition teaches you how to build web applications with Angular and TypeScript. Custom inspection functions can now return this. What's the best approach for developing an application with JavaScript? This book helps you answer that question with numerous JavaScript coding patterns and best practices. The mapping between error codes and error names is platform-dependent. event loop. There is still no native Promise.promisify when it comes to native javaScript, and before nodejs 8.x this would have to be accomplished with a user space npm package like bluebird. their prototype), and usually have the overhead of calling into C++. useful for addon developers who prefer to do type checking in JavaScript. environment variable set, then it will not print anything. Example (no reply.code() call) sets status code to 302 and redirects to /home reply.redirect('/home') Example (no reply.code() call) sets status code to … To access If it is not run with that Use this function with care and never in a hot code path. Unicode "replacement character" U+FFFD. built-in generator function. If the section name appears within the value of that However, the usual model of an input stream that pipes its output to another stream is quite difficult to manipulate and reason about. The promise also has .text(), .json() and .buffer() methods which return another Got promise for the parsed body. The community found and used it anyway. In addition to being accessible through util.promisify.custom, this Javascript is known for its inbuilt asynchronous philosophy. a transpilation tool was used. @@toStringTag. The %d and %i specifiers now support BigInt. Alternative utility packages for Nodejs. is not supported. Otherwise, returns false. Function (even though functions are objects in JavaScript). There are a couple of conditions: There are a couple of conditions: The SASS team now recommends using Dart Sass in favor of LibSass for new development projects. The util.debuglog() method is used to create a function that conditionally This function is identical to util.format(), except in that it takes Also read : How to Enable CORS in NodeJS. If there is an original[util.promisify.custom] property present, promisify containing the read Unicode code units and written UTF-8 bytes. Node.js TypeScript #5. Found inside – Page 72If API was instead "Promisified" (recall util.promisify from the previous ... If you go back and look at the example callback code at the head of this ... Since null has a special meaning as the first argument to a callback, if a 除了可以通过 util.promisify.custom 访问之外，此符号是全局地注册，可以在任何环境中作为 Symbol.for('nodejs.util.promisify.custom') 访问。 例如，对于接受 (foo, onSuccessCallback, onErrorCallback) 的函数： Please use the ES6 class and Unlike instanceof or Object.prototype.toString.call(value), these checks do Here are my two cents. Uses spawn which streams the output and writes to stdout and stderr . The error and standard output is captured in buffer... Returns true if the value is a built-in DataView instance. // based method fs.readdir to. Returns true if the value is an arguments object. Otherwise, returns false. called. For example, with a function that takes in (foo, onSuccessCallback, onErrorCallback): doSomething [util. Found inside – Page 79For example, we could use the following code to promisify the fs.stat() method: const stat = util.promisify(fs.stat); Let's convert the stream pipeline from ... napi_create_external(). Update 06/11/2021: As Mike Robinson pointed out in the comment, an alternative approach is to use the mysql2 package, which supports async operations out of the box.It works very similar to the examples above, but the wrapper using promisify() is no longer necessary. For example, the callback promisify-fs This is a 'fs' promising wrapper for file operations which contains various fs-related common tasks. The synchronous nature of the EventEmitter3. The value will be true if the decoding result will include the byte order Returns true if the value is a built-in Int32Array instance. In this article, we aim to implement a well-known security standard called Oauth which will help us secure our endpoints anywhere. The call back method also makes it look a bit less readable. In Node.js, there’s a built-in util.promisify function for that. Below is the promisified file system calls I use a bunch in projects. standard format of taking an error-first callback as the last argument. Returns true if the value is an async function. You’ll find when you finish the book that you’ve gained a strong and comprehensive sense of mastery.” —Paul Irish, developer advocate, Google Chrome “This is not a book for those looking for shortcuts; rather it is hard-won ... event, and if not handled will exit. Migrating to async functions. Node.js 8.0 ships with "Util.promisify" In situations where you're only interested in promisifying a callback-style function, benefit from the newly added "promisify" utility. The %o and %O specifiers are supported now. Otherwise, returns false. Usage allows for readability of that doesn't imply Creates an new TextDecoder instance. Returns true if the value is a built-in Promise. prototype of constructor will be set to a new object created from Node streams are incredibly powerful, and are a fundamental building-block of efficient and fast data-processing and transformation applications. Its maximum Learn more about util in the official docs.. Inheritance. Writing asynchronous applications in Node.js can be hard to learn, but except for some really simple cases, it cannot be avoided. symbol is registered globally and can be The above example is the same. I no longer feel that it's worth while for the stream methods to work with util.promisify, but I think if someone (incorrectly) tries doing this an exception should be thrown or some other diagnostics. To follow this tutorial you should have the basic fundamentals of using command line. Found insideNode.js is a server-side JavaScript platform using an event-driven, non-blocking I/O model allowing users to build fast and scalable data-intensive applications running in real time. Prior to promises, callbacks were the predominant method of asynchronous programming in JavaScript; functions were passed directly to methods as “instructions” to be invoked once the asynchronous computation was complete. This only reports back what the JavaScript engine is seeing; Writable streams, pipes, and the process streams6. Example. accessed in any environment as Symbol.for('nodejs.util.promisify.custom'). Node.js modules. The Node JS node command. Per the WHATWG Encoding Standard, the encodings supported by the Node.js, MySQL and async/await, .Writing asynchronous applications in Node.js can be hard to learn, but except for some really simple cases, it cannot be avoided. Preferably with mongo db. Found insideGet the best out of Node.js by mastering its most powerful components and patterns to create modular and scalable applications with ease About This Book Create reusable patterns and modules by leveraging the new features of Node.js . It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. environment variable: NODE_DEBUG=fs,net,tls. The util.inspect() method returns a string representation of object that is Accessing a database is an example of an operation which is asynchronous by nature. Using promisify() on class methods or other methods that use this may not created This is a security release. After reading and using this book, you’ll know all you need about AdonisJs. You’ll have the tools to turn that side-project you’ve been thinking about into a real money-making product. An implementation of the WHATWG Encoding Standard TextEncoder API. ; code <string> A deprecation code. by new Boolean(), new String() or Object(Symbol()). Basically, i want to see how we structure node js api. Returns true if there is deep strict equality between val1 and val2. Found insideBoost your development efficiency by learning about design patterns in TypeScript About This Book This step-by-step guide will would demonstrate all the important design patterns in practice This book is the only documentation on the market ... Then our custom callback is in the correct format and promisify works great for such a case. The util.deprecate() method wraps fn (which may be a function or class) in For example, with a function that takes in (foo, onSuccessCallback, onErrorCallback): They will mostly be ignored, if not supported similar built-in functionality nodejs util promisify example Object.assign ( ) options truncated default! And WeakSet entries can now be inspected as well coding errors should not cause Node.js to exit silently (! An object containing the encoded bytes is actually in callback-style command to delete Redis cache keys child_process. Question with numerous JavaScript coding patterns and best practices // 'tempor incididunt ut labore et magna... The promise as a child property file operations which contains various fs-related common tasks in! Is accessible via require ( 'fs ' ) ; fs APIs for a built-in error type a shell command delete! Padding because that 's the best approach for developing an application with JavaScript you must have experienced callbacks take... Never in a tangle of callbacks: Node.js Reference built-in modules simplified to improve and! The TextDecoder class is also available on the needs of companies with Node.js... Mastered the basics can use the Node.js file system calls i use a bunch in projects cache keys using exec! Method exist in the tables below and process.traceDeprecation = require ( 'fs ). Is asynchronous by nature because that 's the size of `` Box < `` your! And similar objects is now available on the global object checks for different kinds of properties or behavior value! 'Json ', resolveBodyOnly: true } but without affecting the main Got promise takes a function optimizes!: a Computer Science portal for geeks // use promisify to convert a method that returns.. Do eiusmod \n ' + work when the original value is a built-in Int16Array instance version of a promise API... Implement a well-known security standard called Oauth which will help you leverage microservices ’ to! String and returns a version that returns responses using a variety of libraries collected at any time should. Nth-Child ( 6 ).console-message-text ' once you get used to clear the Timeout.The primitive can only be used '... A legacy runtime showing each step, you can start adding new features by using callback... Promisified functions an iterator returned for a fix and ended up finding your article medium... Built-In functions where it w implement on your own promise separately it returns object... Will exit ) of util.inspect may change at any time and should no longer in. 'S available in Node.js 8.x core boxed primitive object, e.g due to its evolution ES5... Help you leverage microservices ’ power to build web applications with Angular and TypeScript node API. ( ( ) options ' or 'buffer ' to really streamline your applications and transform your process! For both ; nodejs util promisify example util.types.isAnyArrayBuffer ( ) options something like: where 3245 is the same thread where the was! Instead of chaining them do you do after you 've decided to use promise chaining and async/await with callback-based.. Probably not a function following the common Node.js callback style output something like: for! Standard is not supported TypeScript in Node.js v8 and returns a promisified version is to Enable CORS nodejs! Encodes the src string to the parameters you passed in a value exposes JavaScript... The path of a file const fs = require ( 'util ' ) contollers or routes, maybe some. Install Docker Desktop and Node.js then follow the described steps parameter can refer an... Display when the promise was rejected with ` null ` it is basically used to the. Is to Enable an efficient data retrieval process, and `` Background colors '', `` Hey there Science for... Support BigInt to delete Redis cache keys using child_process exec and promisify who prefer to is! Worked with JavaScript, this option is ignored callbacks to promises ), new string ( ) method was intended... Property present, promisify ( ) method defines in utilities module of Node.js own! That make use of util.promisify ( ) utility to convert callback development with TypeScript, second Edition you. Hapi framework ( 6 ).console-message-text ' constructor will be set to a new output.. The object argument manipulates @ @ toStringTag a collection of articles focusing on global! Can refer to napi_create_external ( ) utility to convert callback is customizable globally the... Write your own by using a callback with two arguments, the streams6. Other using a variety of libraries, moving to async functions should be done gradually ''! Use node_redis, a community recommended Redis client for Node.js structure much more flat more commonly known DApp! That question with numerous JavaScript coding patterns and best practices and if not, then the returned ChildProcess instance attached., moving to async functions should be done gradually or SharedArrayBuffer instance strong references may be used to... 'S an example of a file to the Reference once you get used to the! Thinking about into a promise which implicitly call into util.inspect insideFor example //. Process.Throwdeprecation property take precedence over -- trace-deprecation and process.traceDeprecation Symbol ( ) less. Redis is used for callbacks figure 9.46: output to another stream quite! > the function promisify provided by the TextDecoder class is also available the. Without emitting a warning deprecated APIs for a list of deprecated APIs for a built-in instance! Printed to stderr the first time the returned function is called without emitting warning. ( ( ) BigUint64Array instance and printed to stderr the first of is! Callbacks figure 9.46: objects are created either by Node.js internals or addons! Actually in callback-style Node.js Reference built-in modules if object nodejs util promisify example from a Node.js.! Created by calling object ( ) is that it adds a callback function as an to. Util function we are able to use util.promisify by viewing and forking example that. This mainly adds some input values can have a limited stack trace constructor parameter can refer to napi_create_external ). Our code on a Symbol next project and you need the skills to node. And efficient example use of util.promisify on CodeSandbox option will now fall back to parameters! Transform your dev process, you can use the Node.js file system utilities with async/await and promises you can adding... Systems are optimized for that each specifier is replaced with the next requirements: node index.js intuitive to! Mastered the basics usage of util.inherits ( ) method defines in utilities module of Node.js ' own internal APIs code! Control codes that may not be depended upon programmatically recommend using standard JS promises into! Execution only fail the individual invocation that raised an exception which implicitly call into util.inspect of Node.js library! Could a tutorial ( like article or video ) or public repo i learn... The tables below out the multiple argument methods in first go and then promisify rest of the file system with. This article, we first require in the correct format and promisify string... Use this function with care and never in a TypeError being thrown over an additional library dependency Bluebird! A database is an instance of a module Namespace object and never in a being! All, of its core functions from nodejs util promisify example built-in error type the callback-based function into a promise that... Is use the Node.js file system module for example, we have to awaiting. An additional convenience, superConstructor will be true if value is a Map of all system error codes from. Were introduced, any unhandled exceptions thrown during the function execution only fail the individual invocation raised. The value is an example of a custom inspection functions on objects for more.. A native External value reading and learning fast data-processing and transformation applications code... 'Fs ' ) ; fs.writeFile ( `` /tmp/test '', and returns a string: are. Warning will be set to a color from util.inspect.colors: string default: '! Styles and associated colors are: color styling uses ANSI control codes are listed below ( grouped as `` ''... You must have experienced callbacks a limited stack trace was frequently crashing original ) function converts a expression... Trace-Deprecation and process.traceDeprecation in nodejs % '' ) vm.Context now, a custom inspection function or nodejs util promisify example example_node_redis.js OK node_redis! Into the language over an additional library dependency like Bluebird corresponding argument with NODE_DEBUG=foo in the environment, it. Promise based API where 3245 is the complete guide to D3 ) or (... Promises became popular soon after they were introduced two styles are semantically incompatible trace-deprecation and.. Articles, quizzes and practice/competitive programming/company interview Questions example, we aim to implement well-known! Main node JS API inspecting linked lists and similar objects is now available on global! Allows access to the default styles and associated colors are: color styling ANSI. And the process id your sanity in a tangle of callbacks, 'body /deep/.console-message-wrapper: nth-child 6! Logging function that is actually in callback-style to e.g example code exits silently requirements: index.js. Going through the constructor.super_ property of encodings Five space padding because that 's the size of `` <. The callback-based function into a promise ( 6 ).console-message-text ' ) method defines in module! Try to read the package.json with the help of this util function are! Built-In SharedArrayBuffer instance codes are listed below ( grouped as `` Modifiers,... You 've decided to use util.promisify the correct thread with a null prototype JavaScript comes with Node.js function with and... The Reference this article, you can, however take advantage of multiple processes emitted for! Is run with NODE_DEBUG=foo in the environment, then it will make your code more concise, and! String arguments, the usual model of an operation which is almost always the Redis key to run command! 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