Cron Parser

Name: Cron Parser
Author: lazymac2x

lazymac2x/cron-parser-api

Updated April 11, 2026
lazymac2x/cron-parser-api

> ⭐ **Building in public from $0 MRR.

About

> ⭐ **Building in public from $0 MRR.** Star if you want to follow the journey - [lazymac-mcp](https://github.com/lazymac2x/lazymac-mcp) (42 tools, one MCP install) · [lazymac-k-mcp](https://github.com/lazymac2x/lazymac-k-mcp) (Korean wedge) · [lazymac-sdk](https://github.com/lazymac2x/lazymac-sdk) (TS client) · [api.lazy-mac.com](https://api.lazy-mac.com) · [Pro $29/mo](https://coindany.gumroad.com/l/zlewvz). [![npm](https://img.shields.io/npm/v/@lazymac/mcp.svg?label=%40lazymac%2Fmcp&color=orange)](https://www.npmjs.com/package/@lazymac/mcp)

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Cron Parser by the numbers

Exposes 6 verified tools (MCP introspection)
Data as of Jul 9, 2026 (Skillselion catalog sync)

terminal

claude mcp add --transport http cron-parser https://api.lazy-mac.com/cron-parser/mcp

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Transport	HTTP
Auth	None
Tools	6
Last updated	April 11, 2026
Repository	lazymac2x/cron-parser-api ↗

How do agents access cron-parser-api capabilities without custom integration code?

Who is it for?

Developers wiring cron-parser-api into Cursor, Claude Desktop, or other MCP clients.

Skip if: Teams that need features outside the documented cron-parser-api tool surface.

What you get

Configured MCP host can call cron-parser-api tools with schemas from the server README.

Validated cron expressions aligned with your worker or job configuration
Agent-readable explanations of schedule fields and intended run behavior
Fewer bad deploys caused by malformed cron strings in code or wrangler config

By the numbers

[object Object]

At a glance

Cron Parser capabilities & compatibility

Capabilities: [![npm](https://img.shields.io/npm/v/@lazymac/mc · [![smithery](https://img.shields.io/badge/smithe · [![lazymac pro](https://img.shields.io/badge/laz · [![api.lazy mac.com](https://img.shields.io/badg
Use cases: api development · orchestration
Runs: Local or remote
Pricing: Bring your own API key

Tools 6

Public tool metadata - what this server can do for an agent.

explain_cron1 param

Explain a cron expression in human-readable form and show parsed fields. Supports @presets like @daily, @weekly.

expressionstringrequiredCron expression (e.g. "*/5 * * * *" or "@daily")

validate_cron1 param

Check if a cron expression is valid. Returns {valid: bool, error?: string}.

expressionstringrequiredCron expression to validate

next_runs3 params

Get the next N scheduled run times for a cron expression. Uses standard Unix OR semantics for day fields.

expressionstringrequiredCron expression
countnumberNumber of next runs to return (1-20, default 5)
fromstringISO 8601 start date (default: now)

generate_cron4 params

Generate a cron expression from human-friendly options.

everystringrequiredFrequency
atobject
onobject
monthnumberMonth (1-12)

diff_cron2 params

Compare two cron expressions and return per-field differences.

firststringrequiredFirst cron expression
secondstringrequiredSecond cron expression

common_crons

List commonly used cron expressions with descriptions.

README.md

cron-parser-api

⭐ Building in public from $0 MRR. Star if you want to follow the journey — lazymac-mcp (42 tools, one MCP install) · lazymac-k-mcp (Korean wedge) · lazymac-sdk (TS client) · api.lazy-mac.com · Pro $29/mo.

🚀 Want all 42 lazymac tools through ONE MCP install? npx -y @lazymac/mcp · Pro $29/mo for unlimited calls.

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