encore-go-cron

Encore Go Cron Jobs

Instructions

A cron.NewJob declaration in Encore Go ties a schedule to an existing //encore:api endpoint. The endpoint runs at the chosen cadence. Declare the job as a package-level variable — not inside a function.

package cleanup

import (
    "context"
    "encore.dev/cron"
)

// 1. The endpoint to call (typically private: //encore:api private)
//encore:api private
func CleanupExpiredSessions(ctx context.Context) error {
    // Cleanup logic
    return nil
}

// 2. Package-level cron declaration
var _ = cron.NewJob("cleanup-sessions", cron.JobConfig{
    Title:    "Clean up expired sessions",
    Schedule: "0 * * * *", // Every hour
    Endpoint: CleanupExpiredSessions,
})

Schedule Formats

Field	Example	Description
Every	"1h", "30m", "6h"	Simple interval. Must divide 24h evenly — "7h" is invalid.
Schedule	"0 9 * * 1"	Standard cron expression (5 fields, UTC).

Common cron expressions

Cron	Meaning
"0 * * * *"	Every hour, on the hour
"0 2 * * *"	Daily at 02:00 UTC
"0 0 * * 0"	Weekly on Sunday at midnight UTC
"0 4 15 * *"	04:00 UTC on the 15th of each month

Important behaviour

• Cron jobs do not execute when running locally with encore run. Only deployed environments fire crons.
• The cron endpoint should be private so it can't be triggered externally — only the cron scheduler should call it.
• All times in Schedule are UTC. Convert from local time when designing the schedule.
• The endpoint must be defined at module load — declare it before the cron.NewJob reference.

Guidelines

• Use Every for "run on a regular interval" (must divide 24h).
• Use Schedule for specific times of day or days of week.
• Keep endpoint logic idempotent: a cron may fire late or be retried in a redeploy window.
• For event-driven background work (not time-driven), use the encore-go-pubsub skill instead.