Preview schedule

POST /api/v1/schedules/preview

Validate timing and return upcoming occurrences without saving a schedule.

Access

A Bearer API key for this workspace with write permission is required. The server also checks the owner’s permission for this resource and action. An inaccessible object is not disclosed.

Parameters

Example request parameters or JSON body:

{
  "kind": "cron",
  "preset": {
    "cron": "0 2,12 * * *"
  },
  "timezone": "Europe/Moscow"
}

kind and timezone are required; preset depends on the kind. window_start and window_end limit the window. Invalid timing returns 422 bad_schedule; an empty intersection returns 422 empty_schedule.

Response 200

The example is shortened; actual responses may include more fields. Sample IDs are placeholders.

{
  "cron": "0 2,12 * * *"
}

Send the request

Set BASE to your installation URL without a trailing slash and API_KEY to a secret stored on your server. Client setup and browser JavaScript.

curl

curl --fail-with-body -X POST "$BASE/api/v1/schedules/preview" \
  -H "Authorization: Bearer $API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
  "kind": "cron",
  "preset": {
    "cron": "0 2,12 * * *"
  },
  "timezone": "Europe/Moscow"
}
JSON

Node.js · server

// Node.js server example. Save as request.mjs.
const response = await fetch(process.env.BASE + "/api/v1/schedules/preview", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.API_KEY}`,
    Accept: "application/json",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({"kind":"cron","preset":{"cron":"0 2,12 * * *"},"timezone":"Europe/Moscow"}),
  signal: AbortSignal.timeout(120000)
});
if (!response.ok) throw new Error(`${response.status}: ${await response.text()}`);
console.log(await response.json());

Python

import json
import os
import urllib.request
import urllib.error

body = '{"kind":"cron","preset":{"cron":"0 2,12 * * *"},"timezone":"Europe/Moscow"}'.encode("utf-8")
request = urllib.request.Request(
    os.environ["BASE"] + "/api/v1/schedules/preview",
    method="POST",
    headers={"Authorization": "Bearer " + os.environ["API_KEY"],
             "Accept": "application/json", "Content-Type": "application/json"},
    data=body,
)
try:
    with urllib.request.urlopen(request, timeout=120) as response:
        print(json.load(response))
except urllib.error.HTTPError as error:
    print(error.code, error.read().decode("utf-8", errors="replace"))
    raise

PHP · external client

<?php
$handle = curl_init(getenv("BASE") . "/api/v1/schedules/preview");
curl_setopt_array($handle, [
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TIMEOUT => 120,
    CURLOPT_HTTPHEADER => [
        "Authorization: Bearer " . getenv("API_KEY"),
        "Accept: application/json",
        "Content-Type: application/json",
    ],
    CURLOPT_POSTFIELDS => <<<'JSON'
{"kind":"cron","preset":{"cron":"0 2,12 * * *"},"timezone":"Europe/Moscow"}
JSON,
]);
$content = curl_exec($handle);
$status = curl_getinfo($handle, CURLINFO_RESPONSE_CODE);
if ($content === false) {
    throw new RuntimeException(curl_error($handle));
}
curl_close($handle);
if ($status < 200 || $status >= 300) {
    throw new RuntimeException("HTTP $status: $content");
}
print_r(json_decode($content, true, 512, JSON_THROW_ON_ERROR));

Go

package main

import (
    "fmt"
    "io"
    "net/http"
    "os"
    "time"
    "strings"
)

func main() {
    body := strings.NewReader(`{"kind":"cron","preset":{"cron":"0 2,12 * * *"},"timezone":"Europe/Moscow"}`)
    request, err := http.NewRequest("POST", os.Getenv("BASE") + "/api/v1/schedules/preview", body)
    if err != nil { panic(err) }
    request.Header.Set("Authorization", "Bearer " + os.Getenv("API_KEY"))
    request.Header.Set("Accept", "application/json")
    request.Header.Set("Content-Type", "application/json")
    client := &http.Client{Timeout: 120 * time.Second}
    response, err := client.Do(request)
    if err != nil { panic(err) }
    defer response.Body.Close()
    content, err := io.ReadAll(response.Body)
    if err != nil { panic(err) }
    if response.StatusCode < 200 || response.StatusCode >= 300 {
        panic(fmt.Sprintf("HTTP %d: %s", response.StatusCode, content))
    }
    fmt.Println(string(content))
}

If the request fails

401: check the key and its expiry. 403: check permissions, read/write scope, and 2FA. 404: check the ID and workspace. 422: check fields and resource state. 429: respect Retry-After. Errors and retries.