quartz-cron-checker
Simple Python library to check if a Quartz cron expression is valid.
Decision gist · record as of 2026-08-14
Yes, if you need strict Quartz cron validation and are comfortable with aging maintenance. The package is lightweight, dependency-free, and covers the full Quartz spec including special characters and named values. However, verify the license terms first (currently unclear in metadata) and be aware that no active development is visible—bug fixes or feature updates are unlikely without a maintainer revival.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low install friction—pure Python wheel with no runtime dependencies.
- Maintenance status is aging: last release was 442 days ago with no recent commits visible, so expect no active development or rapid bug fixes.
License · maintenance · safety
(unclear) — License status is unclear—no SPDX identifier or raw license text provided. Before adopting in a commercial or copyleft context, verify the actual license terms from the project source.
last release 2025-05-29 (442 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 101,258 downloads/mo, #12,950 on PyPI
Alternatives
Verify before relying
from quartz_cron_checker import QuartzCronChecker, validate_cron_string
# Parse and validate
cron = QuartzCronChecker.from_cron_string("0 0 12 ? * MON-FRI")
cron.validate() # Raises if invalid
# Or validate directly
result = validate_cron_string("0 0 12 ? * MON-FRI") # Returns True- Whether the project is actively maintained or has been abandoned despite the aging status.
- Actual license terms—SPDX and raw license fields are both null in the metadata.
What it is and what it does
quartz-cron-checker is a lightweight validator for Quartz cron expressions in Python. It parses and validates 6- or 7-field cron strings (second, minute, hour, day-of-month, month, day-of-week, and optional year) against the full Quartz specification, including support for special characters like `*`, `?`, `L`, `W`, and `#`, as well as named months and days. It enforces mutual exclusivity between day-of-month and day-of-week fields and provides detailed error messages when validation fails.
The package offers both object-oriented and functional APIs: you can parse a cron string into a QuartzCronChecker object and call validate() on it, or use standalone functions like validate_cron_string() and validate_day_of_month() to check individual fields. It has no runtime dependencies and requires Python 3.10 or later.
Use it for
- Validate cron expressions before passing them to a Quartz scheduler or job queue system.
- Parse and inspect individual cron fields (second, minute, hour, etc.) for configuration validation.
- Enforce strict Quartz cron syntax in a configuration file or API that accepts cron schedules.
- Catch malformed cron expressions early with detailed error messages during application startup.
- Build a cron expression builder or editor that needs to validate user input against Quartz rules.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need strict Quartz cron validation and are comfortable with aging maintenance.
The package is lightweight, dependency-free, and covers the full Quartz spec including special characters and named values. However, verify the license terms first (currently unclear in metadata) and be aware that no active development is visible—bug fixes or feature updates are unlikely without a maintainer revival.
Install
quartz-cron-checker on PyPI
Before you install
Low install friction—pure Python wheel with no runtime dependencies. Maintenance status is aging: last release was 442 days ago with no recent commits visible, so expect no active development or rapid bug fixes.
Requires Python 3.10 or later.
License in practice
License status is unclear—no SPDX identifier or raw license text provided. Before adopting in a commercial or copyleft context, verify the actual license terms from the project source.
Quickstart
from quartz_cron_checker import QuartzCronChecker, validate_cron_string
# Parse and validate
cron = QuartzCronChecker.from_cron_string("0 0 12 ? * MON-FRI")
cron.validate() # Raises if invalid
# Or validate directly
result = validate_cron_string("0 0 12 ? * MON-FRI") # Returns TrueVerify before relying
- Whether the project is actively maintained or has been abandoned despite the aging status.
- Actual license terms—SPDX and raw license fields are both null in the metadata.
Package facts
| License | Not declared unclear |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Aging 442 days since the last release |
| First released | |
| Downloads | 101,258 / month, #12,950 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
Evidence: quartz_cron_checker-0.2.1-py3-none-any.whl
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See also aws-cron-expression-validator · cronex · cronsim · cron-validator · tzcron · cron-schedule-triggers · croniter · crontab · pyawscron · aws-croniter