Themis VS DOMPurify

Compare Themis vs DOMPurify and see what are their differences.


Easy to use cryptographic framework for data protection: secure messaging with forward secrecy and secure data storage. Has unified APIs across 14 platforms. (by cossacklabs)


DOMPurify - a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify works with a secure default, but offers a lot of configurability and hooks. Demo: (by cure53)
InfluxDB - Power Real-Time Data Analytics at Scale
Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
SaaSHub - Software Alternatives and Reviews
SaaSHub helps you find the best software and product alternatives
Themis DOMPurify
2 44
1,820 13,146
0.7% -
4.5 9.0
about 1 month ago 4 days ago
C JavaScript
Apache License 2.0 GNU General Public License v3.0 or later
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of Themis. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-05-12.


Posts with mentions or reviews of DOMPurify. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-06-10.
  • Safely Handling HTML in React
    1 project | | 15 Jun 2024
    When using dangerouslySetInnerHTML, it is crucial to sanitize the HTML strings to prevent XSS attacks. DOMPurify is a robust library that cleans HTML content by removing or neutralizing potentially dangerous scripts or tags.
  • Show HN: Markdown HN profiles at {user}
    9 projects | | 10 Jun 2024
    Since marked doesn't do it for you, make sure you sanitize the user input (the text on the user profiles) before rendering it to visitors.

    Some libraries for doing that with good defaults:




    (right now your site looks vulnerable to XSS)

  • JavaScript Libraries for Implementing Trendy Technologies in Web Apps in 2024
    12 projects | | 9 Apr 2024
  • Lessons from open-source: Use window.trustedTypes to prevent DOM XSS.
    2 projects | | 8 Apr 2024
  • Launched my Social Media website for lonely people living abroad, all thanks to NextJS!
    1 project | /r/nextjs | 8 Dec 2023
    I saw that some people were injecting alerts. If you haven't fixed it yet, consider using something like DOMPurify to sanitize the HTML input before posting it to the db.
  • Mastering DOM manipulation with vanilla JavaScript
    5 projects | | 6 Nov 2023
    You mean from this article "Sanitize HTML strings"?

    Yeah, that article really shouldn't imply that sanitization is "that easy". It does at least mention at the end but it should LOUDLY argue against attempting to write this particular thing yourself and promote that exclusively in my opinion.

  • Crafting a Dynamic Blog with Next.js 13 App Directory
    3 projects | | 1 Sep 2023
    It is highly recommended to use an XSS Sanitizer like DOMPurify to sanitize HTML and prevent XSS attacks. For Next.js projects, which prominently feature server-side rendering, Isomorphic DOMPurify is especially valuable. It offers a seamless sanitization process across both server and client, ensuring consistent HTML sanitization in environments like Next.js where a native server-side DOM isn't present.
  • Mitigating DOM clobbering attacks in JavaScript
    1 project | | 7 Aug 2023
    Note: We’ve used DOMPurify to sanitize the HTML in the above code block. You can install it in Node.js with npm install dompurify. Include it in your HTML with .
  • 5 injection vulnerabilities hackers don't want developers to know about (and how to prevent them)
    3 projects | /r/node | 22 Jun 2023
    body, input.value property, or body are all different). If you need to insert untrusted input into raw HTML, use a well-tested sanitizer such as DOMPurify.

    Setting a strong Content Security Policy without unsafe-inline or unsafe-eval in the script-src or default-src directives is an effective defense-in-depth) measure to prevent modern browsers from executing attacker code even if the attacker is able to insert </code> elements into the page.</p> <p><strong>3. HTTP API injection</strong></p> <p>RESTful APIs, GraphQL, and other HTTP-based APIs are ubiquitous. When a web application makes an API call to another service, injection vulnerabilities are possible when that request includes untrusted input.</p> <p>Consider a contrived example in which a web app integrates with a payments service that has a REST API endpoint for creating a subscription: <code>POST /subscriptions/{product_id}?price_usd=<price></code> where <code>price_usd</code> is optional, and a pre-configured price is used if omitted. If an attacker controls the value of <code>product_id</code> and passes a value of <code>desired_product_id?price_id=0</code>, the web app would end up making a request to <code>POST /subscriptions/desired_product_id?price_id=0</code>, which would allow the attacker to sign up for a free subscription.</p> <p>In JavaScript, the standard way to sanitize untrusted inputs in URL paths is <a href=""><code>encodeURIComponent</code></a>, which replaces problematic characters such as <code>?</code> and <code>/</code> with safe percent-encoded sequences. When inserting untrusted input into URL query parameters, <a href=""><code>new URLSearchParams(queryParams)</code></a> provides a convenient, safe interface for building a query string from a JavaScript object of key-value pairs.</p> <p><strong>4. Shell injection</strong></p> <p>Backend APIs sometimes need to execute external commands on the machine where they run. Consider an API that performs <a href="">WHOIS</a> lookups for a requested domain by executing the <code>whois</code> command locally.</p> <p>Consider the following <strong>vulnerable</strong> Node.js code:</p> <pre><code>const whois = child_process.execSync(`whois ${whoisRequest.domain}`); </code></pre> <p>If an attacker can pass the domain <code> && rm -rf /</code>, the backend will execute the command <code>whois && rm -rf /</code>. The <a href=""><code>child_process.execSync</code></a> function passes the command string to the shell (<code>/bin/sh</code> by default on Linux), which parses <code>&& rm -rf /</code> as a subsequent command to wipe the filesystem.</p> <p>To avoid this issue, <strong>never pass untrusted input to a shell</strong>. Instead, use an interface such as <a href=""><code>child_process.execFileSync</code></a> that executes a specific binary (which shouldn't be a shell!) and passes arguments <em>as an array</em>:</p> <pre><code>const whois = child_process.execFileSync("whois", [whoisRequest.domain]); </code></pre> <p>Now, even if the user passes a domain <code> && rm -rf /</code>, that entire string will be passed as the command-line argument to <code>whois</code>, which will exit with an error but will not cause any harmful side-effects. Perhaps an even better solution would be to use a library to perform WHOIS queries without needing to execute a separate command.</p> <p>Astute readers may point out that validating the domain against a regex would also likely prevent shell injection in this case. However, avoiding the possibility of shell injection by using a safe interface that keeps untrusted input away from a shell's command parser is a more robust solution that avoids shell injection in all cases.</p> <p><strong>5. Path traversal</strong></p> <p>Finally, a path traversal vulnerability arises when an untrusted input is inserted into a filesystem path, which can cause the wrong file to be read or even written. Consider a backend API that reads a file at the path <code>/teams/${team_id}/${report_name}.csv</code>. If an attacker controls the value of <code>report_name</code> but not <code>team_id</code>, they could pass a <code>report_name</code> of <code>../other_team_id/private.</code> This would cause the file <code>/teams/team_id/../other_team_id/private.csv</code> (resolved to <code>/teams/other_team_id/private.csv</code>) to be read, leaking data from a different team.</p> <p>To avoid path traversal vulnerabilities, <strong>never use untrusted input in file or directory names</strong>. It's safest always to control the names of files and directories, including IDs that you generate and control (e.g., UUIDs, KSUIDs, etc.). If the name of a file or directory absolutely <em>must</em> be derived from untrusted input, consider hashing it (e.g., using SHA-256) or at least encoding it into a format that doesn't include dots or slashes (e.g., <a href="">URL-safe base64</a>).</p> <p>​</p> <p>Know of good Node.js libraries for avoiding injection vulnerabilities? Let folks know in the comments!</p> </div><!-- SC_ON -->

  • Is it harder to build and maintain web applications using vanilla js or react?
    1 project | /r/Frontend | 2 May 2023

What are some alternatives?

When comparing Themis and DOMPurify you can also consider the following projects:

tweetnacl-java - TweetNaCl in Java - a port of TweetNaCl-js

sanitize-html - Clean up user-submitted HTML, preserving whitelisted elements and whitelisted attributes on a per-element basis. Built on htmlparser2 for speed and tolerance

cryptography - cryptography is a package designed to expose cryptographic primitives and recipes to Python developers.

js-xss - Sanitize untrusted HTML (to prevent XSS) with a configuration specified by a Whitelist

snyk - Snyk CLI scans and monitors your projects for security vulnerabilities. [Moved to:]

HtmlSanitizer - Cleans HTML to avoid XSS attacks

NeDB - The JavaScript Database, for Node.js, nw.js, electron and the browser


Paramiko - The leading native Python SSHv2 protocol library.

Next.js - The React Framework

Crypto++ - free C++ class library of cryptographic schemes

isomorphic-dompurify - Use DOMPurify on server and client in the same way

InfluxDB - Power Real-Time Data Analytics at Scale
Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
SaaSHub - Software Alternatives and Reviews
SaaSHub helps you find the best software and product alternatives