myjwt
Pentesting Tool for JWT(JSON Web Tokens).Modify/Crack/Check Your jwt.
Decision gist · record as of 2026-08-14
Yes. The tool is actively maintained, has no external dependencies, supports current Python versions, carries a permissive license, and has no known vulnerabilities. It is well-suited for security professionals and developers who need to test JWT implementations. Install it if you regularly perform JWT security assessments or CTF challenges.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low install friction with no runtime dependencies.
- Actively maintained with recent commits and production-stable status; supports current Python versions (3.10, 3.11, 3.12).
License · maintenance · safety
permissive license (permissive) — Permissive license allows use in commercial and private projects with minimal restrictions.
last release 2024-07-10 (765 days) · last repo commit 2026-06-08 · 138 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 84,851 downloads/mo, #13,966 on PyPI
Alternatives
Verify before relying
pip install myjwt
myjwt YOUR_JWT_TOKEN --print
myjwt YOUR_JWT_TOKEN --add-payload "username=admin" --sign mysecretkey- Whether the tool's exploitation features (RSA/HMAC confusion, kid injection, jku/x5u bypass) work reliably against real-world JWT implementations.
- Whether brute-force and regex-crack features scale adequately for large wordlists or complex patterns.
- Whether the clipboard integration and HTTP request features work consistently across different operating systems.
What it is and what it does
MyJWT is a command-line pentesting tool designed for security researchers, CTF players, and developers to inspect, modify, and test JWT tokens. It provides a user interface for decoding JWTs, altering headers and payloads, signing with custom keys, and attempting to crack or verify signatures through brute-force or regex-based attacks. The tool also includes features to test known JWT vulnerabilities such as the none algorithm, RSA/HMAC confusion, kid injection, and jku/x5u header bypasses.
The tool operates as a standalone CLI with no external runtime dependencies, making it lightweight to install and run. It can modify JWT components, send crafted tokens to target URLs with custom HTTP methods and data, and copy results to the clipboard for easy integration into testing workflows. It's particularly useful for security assessments where JWT validation logic needs to be tested or where token manipulation is part of the attack surface.
Use it for
- Test for the none algorithm vulnerability in JWT implementations by attempting to bypass signature verification.
- Brute-force JWT secrets using a wordlist to discover weak signing keys used in production systems.
- Modify JWT payloads and headers to test authorization bypass or privilege escalation in web applications.
- Exploit RSA/HMAC algorithm confusion to forge valid signatures using a public key as the HMAC secret.
- Test jku and x5u header injection vulnerabilities to bypass JWT validation through external key sources.
- Crack JWT signatures using regex patterns to guess keys based on known character sets or patterns.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The tool is actively maintained, has no external dependencies, supports current Python versions, carries a permissive license, and has no known vulnerabilities. It is well-suited for security professionals and developers who need to test JWT implementations. Install it if you regularly perform JWT security assessments or CTF challenges.
Install
myjwt on PyPI
Before you install
Low install friction with no runtime dependencies. Actively maintained with recent commits and production-stable status; supports current Python versions (3.10, 3.11, 3.12).
Requires Python 3.10 or later.
License in practice
Permissive license allows use in commercial and private projects with minimal restrictions.
Quickstart
pip install myjwt
myjwt YOUR_JWT_TOKEN --print
myjwt YOUR_JWT_TOKEN --add-payload "username=admin" --sign mysecretkeyVerify before relying
- Whether the tool's exploitation features (RSA/HMAC confusion, kid injection, jku/x5u bypass) work reliably against real-world JWT implementations.
- Whether brute-force and regex-crack features scale adequately for large wordlists or complex patterns.
- Whether the clipboard integration and HTTP request features work consistently across different operating systems.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 765 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 84,851 / month, #13,966 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: ConsoleIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Topic :: Internet :: WWW/HTTPTopic :: Security |
Evidence: myjwt-2.1.0-py3-none-any.whl
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See also python-jwt · jose · jwskate · jwt · python-jose · types-jwt · joserfc · okta-jwt-verifier · django-ninja-jwt · PyJWT