Cron Parser

io.github.lazymac2xPublished by GitHub account lazymac2xv1.0.0Updated Oct 27, 2026

Cloudflare Workers MCP server: cron-parser

The publisher's own server: Parser Club

VerifiedStreamable HTTPWeb executableProductivity & WorkflowDeveloper Tools

Overview

AI-generated overview

Remote MCP server that explains, validates, generates, diffs and schedules cron expressions, including next run times and common presets.

What you can do
  • Explain a cron expression in plain language and show its parsed fields, including presets like @daily
  • Validate a cron expression and get a validity flag with an error message
  • Compute the next N scheduled run times, using standard Unix OR semantics for day fields
  • Generate a cron expression from friendly options such as "every day at 9:00"
  • Compare two expressions field by field and list commonly used cron expressions with descriptions
When to use it
Useful when writing or debugging crontab entries, CI schedules or job configs and you want an assistant to check syntax, translate an expression into plain English, or work out upcoming run times without leaving the chat.
Requirements
A remote streamable HTTP endpoint; no package, account, API key or environment variable is declared. Network access to the provider's host is required.
Before you install
The README advertises a paid Pro tier and a bundled multi-tool package, so some usage may involve payment; the free endpoint's limits are not stated. Expressions you submit are sent to a third-party service.

Installation

In SourceWeft

  1. Open Cron Parser in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.lazymac2x%2Fcron-parser/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "cron-parser": {
      "type": "http",
      "url": "https://api.lazy-mac.com/cron-parser/mcp"
    }
  }
}

README

[logo]

[lazymac API Store] [Gumroad] [MCPize]

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.

[npm] [Smithery] [lazymac Pro] [api.lazy-mac.com]

🚀 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

bash
npm install && npm start  # http://localhost:4400

Endpoints

bash
# Explain a cron expression in plain Englishcurl http://localhost:4400/api/v1/explain/*/5%20*%20*%20*%20*# → "at minutes 0, 5, 10, ..., of every hour"
# Validatecurl http://localhost:4400/api/v1/validate/0%209%20*%20*%201-5
# Next 5 run timescurl "http://localhost:4400/api/v1/next/0%209%20*%20*%20*?count=5"
# Generate cron from descriptioncurl -X POST http://localhost:4400/api/v1/generate \  -H "Content-Type: application/json" \  -d '{"every":"day","at":{"hour":9,"minute":0}}'
# Common cron expressionscurl http://localhost:4400/api/v1/common

License

MIT

💡 Host your own stack? Get $200 DigitalOcean credit via lazymac referral link.

Source: README.md at commit 206dc1f

Tools

6

explain_cron

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

Parametersexpressionrequired

validate_cron

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

Parametersexpressionrequired

next_runs

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

Parametersfromcountexpressionrequired

generate_cron

Generate a cron expression from human-friendly options.

Parametersatoneveryrequiredmonth

diff_cron

Compare two cron expressions and return per-field differences.

Parametersfirstrequiredsecondrequired

common_crons

List commonly used cron expressions with descriptions.

Takes no parameters.

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

90% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.

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