Summary
A Cloudflare Workers based MCP server that parses and manipulates cron expressions through a streamable HTTP interface. Exposes operations to explain cron syntax in plain English, validate expressions, generate the next N run times, create cron strings from structured descriptions (like "every day at 9am"), and list common patterns. Useful when you need Claude to schedule tasks, interpret existing cron jobs, or help users build schedules without memorizing cron syntax. The underlying API supports standard 5-field cron plus presets like @daily and @weekly. Runs as a remote service at api.lazy-mac.com, so no local installation needed beyond MCP configuration.
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cron-parser-api
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Cron expression parser API — explain, validate, generate, and compute next run times. Supports standard 5-field cron + presets (@daily, @weekly).
Quick Start
npm install && npm start # http://localhost:4400
Endpoints
# Explain a cron expression in plain English
curl http://localhost:4400/api/v1/explain/*/5%20*%20*%20*%20*
# → "at minutes 0, 5, 10, ..., of every hour"
# Validate
curl http://localhost:4400/api/v1/validate/0%209%20*%20*%201-5
# Next 5 run times
curl "http://localhost:4400/api/v1/next/0%209%20*%20*%20*?count=5"
# Generate cron from description
curl -X POST http://localhost:4400/api/v1/generate \
-H "Content-Type: application/json" \
-d '{"every":"day","at":{"hour":9,"minute":0}}'
# Common cron expressions
curl http://localhost:4400/api/v1/common
License
MIT
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Plug Mailtrap into your AI workflow and let it handle the email.
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Install now →Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Registryactive
TransportHTTP
UpdatedMay 16, 2026
