Top 15 JavaScript Code Analysis Tools In 2021

The JavaScript code’s quality is often determined by the traditional activities of the unit and functional testing. However, some tools perform checking code before or during its execution for accessing the quality in its adherence to coding standards using a process called code analysis. This article presents a list of open-source tools for performing static and dynamic code analysis on javascript programs.

If we can perform static code analysis separately on a single JavaScript code analysis. Many modern software development organizations will integrate these tools into their continuous integration or delivery procedure. Bad or disrespected code is prevented by this automated approach for the coding standards to reach the production stage. Dynamic code reviews the software when it is implemented by executing programs on a real or virtual processor.

The two mainly used open source tools for JavaScript code analysis are JSLint and JSHint. Developed by the famous Douglas Crockford, JSLint could be considered the core inspiration of the JavaScript code analysis tools.

However, several different tools try to achieve the same hole. We might find something more suitable to our own needs in the list below, especially if we were in specific JavaScript frameworks and contexts like Node.js, Angular, React Vue, Express, or Typescript.

CodeClimate Duplication

It is an engine that plays and supports Java, Ruby, Python, JavaScript, and PHP. We can run it on one command line using the code climate CLI.


Code laser is also an open-source project that presents a set of specific rules for static code report of angular typescript project. We can run the static code analyzer over webpages, NativeScript, Ionic, etc.

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Crawljax is an open-source Java tool used for crawl and testing current web applications automatically. Ajax uses an event-led dynamic raking engine to explore the JavaScript-based Ajax web framework. It automatically creates an event-based transformation chart of the complex DOM-states. This inferred state-flow graph is a highly potent automation vehicle for many web research and testing techniques.

JavaScript Code Analysis
Source: Maxiom


ESLint, a tool for defining and reporting patterns found in ECMAScript/Javascript code, is an open-source static analysis tool. JSLint and JSHint with a few variations are close in several respects. ESLint is designed to be entirely pluggable with all rules. The default rules are just like any plugin rules are written. They should always follow a similar pattern, both for the rules and for exams. Although ESLint ships some constructed guidelines to allow it to be usable at the outset, we can load the rules dynamically at any time. ESLint is written with Node.js, which allows simple and convenient installation by npm.


Esprima is a standard JavaScript translator with exceptional productivity. Suppose the full syntax tree has been collected. In that case, different static language analyzes could be used for insights into the code: syntax visualization, code validation, auto-complete editing with type inferences, etc.


Flow is a Facebook-developed open source, static style checker designed for finding JavaScript-related mistakes. Flow applies JavaScript to static typing to increase the efficiency and consistency of the emerging code. Static typing provides advantages in particular, including early error control, which avoids some forms of execution errors, and machine knowledge, which facilitates code management and optimization.


Iroh is a creative JavaScript open-source code reviewing platform. Iroh facilitates the code flow to be monitored in real-time, intercepted runtime information and exploited fly program actions. Dynamic data analysis helps gather data that is only usable during runtime compared to static analyses (e.g., for Babell and ESlint). Iroh enables information about our running software to be gathered, behaviour, registered, and manipulated, such as parameters or variables, all of which, when our code is currently running!

JavaScript Lint

JavaScript Lint is an open-source JavaScript Code Checker Any source code would be tested for typical errors without any script being executed or the web page is enabled. JavaScript Lint is centred on JSLint. JavaScript Lint is a pioneer over competitive codes since it is based on the Firefox plugin JS code checker. It offers a rigorous structure that can verify the JavaScript syntax and review the script coding techniques and advice about suspicious practices.


JScent is a scanner that detects code smells. Code smells are probable source code bugs that could be a bigger concern in the program. JScent, for example, can diagnose problems like longer processes, function jealousy, message chains, dead code, etc. JScent produces a report that lists all code smells that could be effectively viewed on the monitor descriptively and realistically. JScent analysis may be classified as a value-agnostic analysis method and a meta-properties analysis, as some scents of code rely more on syntax and others on synanthropic and software engineering.

JavaScript Code Analysis

JScent is targeted at developers and teams attempting to develop a well-structured, sustainable, and extensible code. The produced reports are not targeted at prescriptive but at recognizing areas that could be important as the scale and complexity of a project increases. To be conveniently extendable, JScent is structured for introducing additional smells to code in the future.

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JSDeodorant is a tool for evaluating open source code to identify JavaScript simulation class structures about popular JavaScript novels, blogs, and author class/namespace emulation trends. The methodology depends on Closure Compiler’s AST tree and locating class emulation constructs, CommonsJS namespaces, and style plugins with a light-weight analysis of the data flow.


JSHint is an open-source framework for JavaScript code checkers and also implementing coding guidelines for the team. The JavaScript project from Douglas Crockford could be analyzed online on the web of the JSHint.


JSLint is an open-source framework that searches for JavaScript bugs. JSLint is a free source code performance tool. On the JSLint website, we will be able to perform JavaScript code analysis online.

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JSPrime is a JS code checker open-source static vulnerability review platform. A point-and-click tool based on the popular ECMAScript parser from EsprimA is very compact and very simple to use.


Nocuous is a JavaScript and TypeScript static code review tool. The only command (the default command also) at present is a stat. Stat offers JavaScript or TypeScript code toxicity figures.

PHP CodeSniffer

A series of two PHP scripts, the PHP key script for detecting a given specification’s breaches, and the CSS to PHP, JavaScript, and CSS files, and a second php-cbf script for automatically fixing defects. PHP CodeSniffer is a  crucial programming tool to ensure the code is safe and compatible.