pyjsparser
Fast javascript parser (based on esprima.js)
Decision gist · record as of 2026-08-14
Yes, if you need to parse ECMAScript 5.1 code and can accept an unmaintained package. The parser has no dependencies, installs easily, and carries no known vulnerabilities. However, avoid it for modern JavaScript projects that rely on ES6+ features, and be aware that bugs or Python compatibility issues will not be fixed. Consider whether a maintained alternative better suits your timeline.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Installation is straightforward with no runtime dependencies.
- However, the package is abandoned—last release was 2019-04-21 and last commit 2022-04-20—so it will not receive bug fixes or updates for newer JavaScript features or Python versions.
License · maintenance · safety
MIT (permissive) — Licensed under MIT (permissive), so you may use, modify, and distribute it freely with minimal restrictions, though you must include the license notice.
last release 2019-04-21 (2672 days) · last repo commit 2022-04-20 · 255 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 694,728 downloads/mo, #5,313 on PyPI
Alternatives
Verify before relying
pip install pyjsparser
from pyjsparser import parse
ast = parse('var $ = "Hello!"')
print(ast)- Whether the parser correctly handles all ECMAScript 6 features it claims to support, or only a subset
- Compatibility with modern Python versions given the package's abandonment since 2019
- Performance claim of '100k characters per second' on current hardware and Python versions
What it is and what it does
pyjsparser is a Python port of the esprima.js JavaScript parser that converts JavaScript source code into an abstract syntax tree. It was designed to be fast and comprehensible, translating esprima's logic directly to Python rather than wrapping a JavaScript engine.
The parser handles ECMAScript 5.1 fully and supports parts of ECMAScript 6. It produces AST output compatible with esprima's format, making it useful for static analysis, code transformation, or tooling that needs to understand JavaScript structure without executing it. However, the package has not been maintained since 2019, so it will not evolve with newer JavaScript standards or receive compatibility updates for recent Python versions.
Use it for
- Static analysis of JavaScript code to extract variable names, function definitions, or code structure
- Building linters or code quality tools that need to understand JavaScript syntax without running it
- Transforming or transpiling JavaScript code by manipulating its AST representation
- Analyzing third-party JavaScript libraries to understand their API surface or dependencies
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to parse ECMAScript 5.1 code and can accept an unmaintained package.
The parser has no dependencies, installs easily, and carries no known vulnerabilities. However, avoid it for modern JavaScript projects that rely on ES6+ features, and be aware that bugs or Python compatibility issues will not be fixed. Consider whether a maintained alternative better suits your timeline.
Install
pyjsparser on PyPI
Before you install
Installation is straightforward with no runtime dependencies. However, the package is abandoned—last release was 2019-04-21 and last commit 2022-04-20—so it will not receive bug fixes or updates for newer JavaScript features or Python versions.
License in practice
Licensed under MIT (permissive), so you may use, modify, and distribute it freely with minimal restrictions, though you must include the license notice.
Quickstart
pip install pyjsparser
from pyjsparser import parse
ast = parse('var $ = "Hello!"')
print(ast)Verify before relying
- Whether the parser correctly handles all ECMAScript 6 features it claims to support, or only a subset
- Compatibility with modern Python versions given the package's abandonment since 2019
- Performance claim of '100k characters per second' on current hardware and Python versions
Package facts
| License | MIT permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Abandoned 2,672 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 694,728 / month, #5,313 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
Evidence: pyjsparser-2.7.1-py2-none-any.whl
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