ClickUp Reference Architecture

Overview

Production-ready architecture for ClickUp API v2 integrations covering custom fields, time tracking, goals, and two-way sync with external systems.

Architecture Layers

┌──────────────────────────────────────────┐
│          Application Layer               │
│   (Routes, Controllers, Webhooks)        │
├──────────────────────────────────────────┤
│          Service Layer                   │
│   (Business Logic, Orchestration)        │
├──────────────────────────────────────────┤
│          ClickUp Client Layer            │
│   (API Wrapper, Types, Cache, Retry)     │
├──────────────────────────────────────────┤
│          Infrastructure                  │
│   (Queue, Cache, Monitoring, Secrets)    │
└──────────────────────────────────────────┘
          │
          ▼
  api.clickup.com/api/v2/

Custom Fields API

Custom fields let you extend tasks beyond built-in fields. Each field has a UUID and a type.

GET  /api/v2/list/{list_id}/field          Get accessible custom fields
POST /api/v2/task/{task_id}/field/{field_id}  Set custom field value
DELETE /api/v2/task/{task_id}/field/{field_id}  Remove custom field value

Custom Field Types and Value Formats

Type	value Format	Example
text	string	"Release v2.1"
number	number	42
money / currency	number (in smallest unit)	9999 (= $99.99)
date	Unix ms timestamp	1695000000000
drop_down	option UUID from type_config.options	"opt_uuid_123"
labels	array of label UUIDs	["lbl_uuid_1", "lbl_uuid_2"]
checkbox	boolean	true
email	string	"user@example.com"
phone	string	"+1-555-0100"
url	string	"https://example.com"
rating	number (0-5)	4
location	object	{ "lat": 33.749, "lng": -84.388 }

// Get custom fields for a list
const fields = await clickupRequest(`/list/${listId}/field`);
// Response: { fields: [{ id: "uuid", name: "Sprint", type: "drop_down", type_config: { options: [...] } }] }

// Set a dropdown custom field
const sprintField = fields.fields.find((f: any) => f.name === 'Sprint');
const nextSprint = sprintField.type_config.options.find((o: any) => o.name === 'Sprint 24');

await clickupRequest(`/task/${taskId}/field/${sprintField.id}`, {
  method: 'POST',
  body: JSON.stringify({ value: nextSprint.orderindex }),
});

// Set a date custom field
await clickupRequest(`/task/${taskId}/field/${dateFieldId}`, {
  method: 'POST',
  body: JSON.stringify({ value: Date.now() + 604800000 }), // 1 week from now
});

Time Tracking API

POST   /api/v2/team/{team_id}/time_entries     Create time entry
GET    /api/v2/team/{team_id}/time_entries     Get time entries (date range)
GET    /api/v2/team/{team_id}/time_entries/current  Get running timer
GET    /api/v2/task/{task_id}/time             Get tracked time on task
PUT    /api/v2/team/{team_id}/time_entries/{timer_id}  Update entry
DELETE /api/v2/team/{team_id}/time_entries/{timer_id}  Delete entry

// Create a time entry (logged time)
await clickupRequest(`/team/${teamId}/time_entries`, {
  method: 'POST',
  body: JSON.stringify({
    task_id: 'abc123',
    description: 'Worked on auth module',
    start: Date.now() - 3600000, // 1 hour ago
    duration: 3600000,           // 1 hour in ms
    assignee: 183,               // user ID
    billable: true,
  }),
});

// Get entries for a date range (default: last 30 days)
const entries = await clickupRequest(
  `/team/${teamId}/time_entries?start_date=${startMs}&end_date=${endMs}`
);
// Note: negative duration means timer is currently running

Goals API

POST   /api/v2/team/{team_id}/goal         Create goal
GET    /api/v2/team/{team_id}/goal         Get goals
GET    /api/v2/goal/{goal_id}              Get goal
PUT    /api/v2/goal/{goal_id}              Update goal
DELETE /api/v2/goal/{goal_id}              Delete goal
POST   /api/v2/goal/{goal_id}/key_result   Create key result
PUT    /api/v2/key_result/{key_result_id}  Update key result
DELETE /api/v2/key_result/{key_result_id}  Delete key result

// Create a goal with key results
const goal = await clickupRequest(`/team/${teamId}/goal`, {
  method: 'POST',
  body: JSON.stringify({
    name: 'Q1 2026 Engineering OKRs',
    due_date: 1711929600000,
    description: 'Engineering team quarterly objectives',
    multiple_owners: true,
    owners: [183, 456],
    color: '#05a1f5',
  }),
});

// Add a key result (target)
await clickupRequest(`/goal/${goal.goal.id}/key_result`, {
  method: 'POST',
  body: JSON.stringify({
    name: 'Reduce P95 latency to <200ms',
    type: 'number',
    steps_start: 500,
    steps_end: 200,
    unit: 'ms',
    owners: [183],
  }),
});

Two-Way Sync Pattern

// Sync ClickUp tasks to external system and vice versa
class ClickUpSyncService {
  async syncToExternal(listId: string) {
    const { tasks } = await clickupRequest(`/list/${listId}/task?archived=false`);

    for (const task of tasks) {
      await externalSystem.upsert({
        externalId: task.id,
        title: task.name,
        status: this.mapStatus(task.status.status),
        assignee: task.assignees[0]?.email,
        updatedAt: parseInt(task.date_updated),
      });
    }
  }

  async syncFromExternal(externalItem: ExternalItem) {
    if (externalItem.clickupTaskId) {
      await clickupRequest(`/task/${externalItem.clickupTaskId}`, {
        method: 'PUT',
        body: JSON.stringify({
          name: externalItem.title,
          status: this.reverseMapStatus(externalItem.status),
        }),
      });
    }
  }

  private mapStatus(clickupStatus: string): string {
    const map: Record<string, string> = {
      'to do': 'backlog', 'in progress': 'active',
      'review': 'in_review', 'complete': 'done',
    };
    return map[clickupStatus] ?? 'backlog';
  }
}

Error Handling

Issue	Cause	Solution
Custom field UUID not found	Field removed or renamed	Re-fetch fields via /list/{id}/field
Time entry negative duration	Timer still running	Stop timer before reading duration
Goal permission denied	User not goal owner	Add user to goal owners
Sync conflict	Both sides updated	Last-write-wins or manual merge

Resources

• Custom Fields Docs
• Set Custom Field Value
• Time Tracking Endpoints
• ClickUp Developer Portal

Next Steps

For multi-environment setup, see clickup-multi-env-setup.