Endpoints:
GET /template_library.jsonreturns the account's to-do list template library, its to-do set, and its active to-do list templates in title order.
The bucket and to-do set IDs can be used with the existing to-do list and to-do endpoints to create and manage template contents.
{
"bucket": {
"id": 2085958495,
"name": "To-do List Templates",
"type": "TemplateLibrary"
},
"todoset": {
"id": 1069478899,
"title": "To-do List Templates",
"type": "Todoset",
"url": "https://3.basecampapi.com/195539477/buckets/2085958495/todosets/1069478899.json",
"app_url": "https://3.basecamp.com/195539477/buckets/2085958495/todosets/1069478899"
},
"todolists": [
{
"id": 1069480199,
"status": "active",
"visible_to_clients": false,
"created_at": "2026-08-27T16:03:42.233Z",
"updated_at": "2026-08-27T16:03:42.974Z",
"title": "Assigned launch checklist",
"inherits_status": true,
"type": "Todolist",
"url": "https://3.basecampapi.com/195539477/buckets/2085958495/todolists/1069480199.json",
"app_url": "https://3.basecamp.com/195539477/buckets/2085958495/todolists/1069480199",
"bookmark_url": "https://3.basecampapi.com/195539477/my/bookmarks/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVEkiLmdpZDovL2JjMy9SZWNvcmRpbmcvMTA2OTQ4MDE5OT9leHBpcmVzX2luBjsAVEkiCHB1cgY7AFRJIg1yZWFkYWJsZQY7AFQ=--c8f44544c2376fdb5fa8216cb38cbbd5afd3b95e.json",
"comments_count": 0,
"comments_url": "https://3.basecampapi.com/195539477/buckets/2085958495/recordings/1069480199/comments.json",
"boosts_count": 0,
"boosts_url": "https://3.basecampapi.com/195539477/buckets/2085958495/recordings/1069480199/boosts.json",
"bubble_up_url": "https://3.basecampapi.com/195539477/buckets/2085958495/recordings/1069480199/bubble_up.json",
"position": 1,
"parent": {
"id": 1069478899,
"title": "To-do List Templates",
"type": "Todoset",
"url": "https://3.basecampapi.com/195539477/buckets/2085958495/todosets/1069478899.json",
"app_url": "https://3.basecamp.com/195539477/buckets/2085958495/todosets/1069478899"
},
"bucket": {
"id": 2085958495,
"name": "To-do List Templates",
"type": "TemplateLibrary"
},
"creator": {
"id": 1049715913,
"attachable_sgid": "BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVEkiK2dpZDovL2JjMy9QZXJzb24vMTA0OTcxNTkxMz9leHBpcmVzX2luBjsAVEkiCHB1cgY7AFRJIg9hdHRhY2hhYmxlBjsAVA==--e627c45e6b34e08862da23906862412620e4d5d9",
"name": "Victor Cooper",
"personable_type": "User",
"title": "Chief Strategist",
"tagline": "Don't let your dreams be dreams",
"location": "Chicago, IL",
"created_at": "2026-08-27T16:01:09.786Z",
"updated_at": "2026-08-27T16:01:10.505Z",
"email_address": "victor@honchodesign.com",
"bio": "Don't let your dreams be dreams",
"admin": true,
"owner": true,
"client": false,
"employee": true,
"time_zone": "America/Chicago",
"avatar_url": "https://3.basecampapi.com/195539477/people/BAhpBMlkkT4=--5fe7b70fbee7a7f0e2e1e19df7579e5d880c753d/avatar",
"company": {
"id": 1033447817,
"name": "Honcho Design"
},
"can_ping": true,
"can_manage_projects": true,
"can_manage_people": true,
"can_access_timesheet": true,
"can_access_hill_charts": true
},
"description": "",
"description_attachments": [],
"completed": false,
"completed_ratio": "0/1",
"name": "Assigned launch checklist",
"color": null,
"groups_url": "https://3.basecampapi.com/195539477/buckets/2085958495/todolists/1069480199/groups.json",
"todos_url": "https://3.basecampapi.com/195539477/buckets/2085958495/todolists/1069480199/todos.json",
"app_todos_url": "https://3.basecamp.com/195539477/buckets/2085958495/todolists/1069480199/todos",
"comments_app_url": "https://3.basecamp.com/195539477/buckets/2085958495/recordings/1069480199/comments"
},
{
"id": 1069480198,
"status": "active",
"visible_to_clients": false,
"created_at": "2026-08-27T16:03:41.820Z",
"updated_at": "2026-08-27T16:03:41.820Z",
"title": "Project kickoff",
"inherits_status": true,
"type": "Todolist",
"url": "https://3.basecampapi.com/195539477/buckets/2085958495/todolists/1069480198.json",
"app_url": "https://3.basecamp.com/195539477/buckets/2085958495/todolists/1069480198",
"bookmark_url": "https://3.basecampapi.com/195539477/my/bookmarks/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVEkiLmdpZDovL2JjMy9SZWNvcmRpbmcvMTA2OTQ4MDE5OD9leHBpcmVzX2luBjsAVEkiCHB1cgY7AFRJIg1yZWFkYWJsZQY7AFQ=--c8c70a454e67b2c5c3c2cb5edd7eef362e936011.json",
"comments_count": 0,
"comments_url": "https://3.basecampapi.com/195539477/buckets/2085958495/recordings/1069480198/comments.json",
"boosts_count": 0,
"boosts_url": "https://3.basecampapi.com/195539477/buckets/2085958495/recordings/1069480198/boosts.json",
"bubble_up_url": "https://3.basecampapi.com/195539477/buckets/2085958495/recordings/1069480198/bubble_up.json",
"position": 2,
"parent": {
"id": 1069478899,
"title": "To-do List Templates",
"type": "Todoset",
"url": "https://3.basecampapi.com/195539477/buckets/2085958495/todosets/1069478899.json",
"app_url": "https://3.basecamp.com/195539477/buckets/2085958495/todosets/1069478899"
},
"bucket": {
"id": 2085958495,
"name": "To-do List Templates",
"type": "TemplateLibrary"
},
"creator": {
"id": 1049715913,
"attachable_sgid": "BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVEkiK2dpZDovL2JjMy9QZXJzb24vMTA0OTcxNTkxMz9leHBpcmVzX2luBjsAVEkiCHB1cgY7AFRJIg9hdHRhY2hhYmxlBjsAVA==--e627c45e6b34e08862da23906862412620e4d5d9",
"name": "Victor Cooper",
"personable_type": "User",
"title": "Chief Strategist",
"tagline": "Don't let your dreams be dreams",
"location": "Chicago, IL",
"created_at": "2026-08-27T16:01:09.786Z",
"updated_at": "2026-08-27T16:01:10.505Z",
"email_address": "victor@honchodesign.com",
"bio": "Don't let your dreams be dreams",
"admin": true,
"owner": true,
"client": false,
"employee": true,
"time_zone": "America/Chicago",
"avatar_url": "https://3.basecampapi.com/195539477/people/BAhpBMlkkT4=--5fe7b70fbee7a7f0e2e1e19df7579e5d880c753d/avatar",
"company": {
"id": 1033447817,
"name": "Honcho Design"
},
"can_ping": true,
"can_manage_projects": true,
"can_manage_people": true,
"can_access_timesheet": true,
"can_access_hill_charts": true
},
"description": "",
"description_attachments": [],
"completed": false,
"completed_ratio": "0/0",
"name": "Project kickoff",
"color": null,
"groups_url": "https://3.basecampapi.com/195539477/buckets/2085958495/todolists/1069480198/groups.json",
"todos_url": "https://3.basecampapi.com/195539477/buckets/2085958495/todolists/1069480198/todos.json",
"app_todos_url": "https://3.basecamp.com/195539477/buckets/2085958495/todolists/1069480198/todos",
"comments_app_url": "https://3.basecamp.com/195539477/buckets/2085958495/recordings/1069480198/comments"
}
]
}curl -s -H "Authorization: Bearer $ACCESS_TOKEN" \
https://3.basecampapi.com/$ACCOUNT_ID/template_library.jsonPOST /template_library/copies.jsonstarts copying a to-do list template into a project's to-do set.
Required parameters:
template_recording_id- the ID of a to-do list in the template library.destination_parent_id- the ID of the destination project's to-do set.
{
"template_recording_id": 1069480198,
"destination_parent_id": 1069479838
}curl -s -H "Authorization: Bearer $ACCESS_TOKEN" -H "Content-Type: application/json" \
-d '{"template_recording_id":1069480198,"destination_parent_id":1069479838}' -X POST \
https://3.basecampapi.com/$ACCOUNT_ID/template_library/copies.jsonA successful request returns 201 Created with a copy resource. Follow its url to track progress.
{
"id": 3,
"status": "pending",
"source_recording_id": 1069480198,
"destination_parent_id": 1069479838,
"url": "https://3.basecampapi.com/195539477/template_library/copies/3.json"
}When the template contains assignments or completion subscriptions for people who do not have access to the destination project, the response is 422 Unprocessable Entity and identifies the people who would be added:
{
"error": "people_confirmation_required",
"people": [
{
"id": 1049715915,
"name": "Amy Rivera",
"avatar_url": "https://3.basecampapi.com/195539477/people/BAhpBMtkkT4=--9927c47a4cbee30a7f9aea667882496aba799149/avatar"
}
]
}Repeat the request with adding_people_confirmed set to true to grant those people access and start the copy.
GET /template_library/copies/1.jsonreturns the current state of a template copy.
Only the person who started the copy can retrieve it. Requests from anyone else return 404 Not Found, so poll with the same credentials that created the copy.
The status is pending, processing, completed, or failed. Poll the URL no more than once per second while the copy is pending or processing. A completed response includes the newly created to-do list.
{
"id": 3,
"status": "completed",
"source_recording_id": 1069480198,
"destination_parent_id": 1069479838,
"url": "https://3.basecampapi.com/195539477/template_library/copies/3.json",
"destination_todolist": {
"id": 1069480208,
"status": "active",
"visible_to_clients": false,
"created_at": "2026-08-27T16:04:17.805Z",
"updated_at": "2026-08-27T16:04:17.837Z",
"title": "Project kickoff",
"inherits_status": true,
"type": "Todolist",
"url": "https://3.basecampapi.com/195539477/buckets/2085958504/todolists/1069480208.json",
"app_url": "https://3.basecamp.com/195539477/buckets/2085958504/todolists/1069480208",
"bookmark_url": "https://3.basecampapi.com/195539477/my/bookmarks/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVEkiLmdpZDovL2JjMy9SZWNvcmRpbmcvMTA2OTQ4MDIwOD9leHBpcmVzX2luBjsAVEkiCHB1cgY7AFRJIg1yZWFkYWJsZQY7AFQ=--0494faefccb620dc9b3828034fb8c1600bae73f6.json",
"subscription_url": "https://3.basecampapi.com/195539477/buckets/2085958504/recordings/1069480208/subscription.json",
"comments_count": 0,
"comments_url": "https://3.basecampapi.com/195539477/buckets/2085958504/recordings/1069480208/comments.json",
"boosts_count": 0,
"boosts_url": "https://3.basecampapi.com/195539477/buckets/2085958504/recordings/1069480208/boosts.json",
"bubble_up_url": "https://3.basecampapi.com/195539477/buckets/2085958504/recordings/1069480208/bubble_up.json",
"position": 3,
"parent": {
"id": 1069479838,
"title": "To-dos",
"type": "Todoset",
"url": "https://3.basecampapi.com/195539477/buckets/2085958504/todosets/1069479838.json",
"app_url": "https://3.basecamp.com/195539477/buckets/2085958504/todosets/1069479838"
},
"bucket": {
"id": 2085958504,
"name": "The Leto Laptop",
"type": "Project"
},
"creator": {
"id": 1049715913,
"attachable_sgid": "BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVEkiK2dpZDovL2JjMy9QZXJzb24vMTA0OTcxNTkxMz9leHBpcmVzX2luBjsAVEkiCHB1cgY7AFRJIg9hdHRhY2hhYmxlBjsAVA==--e627c45e6b34e08862da23906862412620e4d5d9",
"name": "Victor Cooper",
"personable_type": "User",
"title": "Chief Strategist",
"tagline": "Don't let your dreams be dreams",
"location": "Chicago, IL",
"created_at": "2026-08-27T16:01:09.786Z",
"updated_at": "2026-08-27T16:01:10.505Z",
"email_address": "victor@honchodesign.com",
"bio": "Don't let your dreams be dreams",
"admin": true,
"owner": true,
"client": false,
"employee": true,
"time_zone": "America/Chicago",
"avatar_url": "https://3.basecampapi.com/195539477/people/BAhpBMlkkT4=--5fe7b70fbee7a7f0e2e1e19df7579e5d880c753d/avatar",
"company": {
"id": 1033447817,
"name": "Honcho Design"
},
"can_ping": true,
"can_manage_projects": true,
"can_manage_people": true,
"can_access_timesheet": true,
"can_access_hill_charts": true
},
"description": "",
"description_attachments": [],
"completed": false,
"completed_ratio": "0/0",
"name": "Project kickoff",
"color": null,
"groups_url": "https://3.basecampapi.com/195539477/buckets/2085958504/todolists/1069480208/groups.json",
"todos_url": "https://3.basecampapi.com/195539477/buckets/2085958504/todolists/1069480208/todos.json",
"app_todos_url": "https://3.basecamp.com/195539477/buckets/2085958504/todolists/1069480208/todos",
"comments_app_url": "https://3.basecamp.com/195539477/buckets/2085958504/recordings/1069480208/comments"
}
}curl -s -H "Authorization: Bearer $ACCESS_TOKEN" \
https://3.basecampapi.com/$ACCOUNT_ID/template_library/copies/1.json