Create annotation — API Reference

Add annotations to a task like an annotator does.

You will need to supply the task ID. You can find this in Label Studio by opening a task and checking the URL. It is also listed at the top of the labeling interface. Or you can use Get tasks list.

The content of the result field depends on your labeling configuration. For example, send the following data as part of your POST request to send an empty annotation with the ID of the user who completed the task:

1 {
2 "result": {},
3 "was_cancelled": true,
4 "ground_truth": true,
5 "lead_time": 0,
6 "task": 0
7 "completed_by": 123
8 }

Path parameters

idintegerRequired

Task ID

Request

This endpoint expects an object.

resultlist of maps from strings to anyOptional

Labeling result in JSON format. Read more about the format in the Label Studio documentation.

taskintegerOptional

Corresponding task for this annotation

projectintegerOptional

Project ID for this annotation

completed_byintegerOptional

User ID of the person who created this annotation

updated_byintegerOptional

Last user who updated this annotation

was_cancelledbooleanOptional

User skipped the task

ground_truthbooleanOptional

This annotation is a Ground Truth

lead_timedoubleOptional

How much time it took to annotate the task (in seconds)

Response

Created annotation

idintegerOptional

resultlist of maps from strings to anyOptional

List of annotation results for the task

created_usernamestringOptional

Username string

created_agostringOptional>=1 characterDefaults to

Time delta from creation time

completed_byintegerOptional

unique_idstringOptional>=1 character

was_cancelledbooleanOptional

User skipped the task

ground_truthbooleanOptional

This annotation is a Ground Truth (ground_truth)

created_atdatetimeOptional

Creation time

updated_atdatetimeOptional

Last updated time

draft_created_atdatetimeOptional

Draft creation time

lead_timedoubleOptional

How much time it took to annotate the task

import_idintegerOptional

Original annotation ID that was at the import step or NULL if this annotation wasn’t imported

last_actionenumOptional

Action which was performed in the last annotation history item

taskintegerOptional

Corresponding task for this annotation

projectintegerOptional

Project ID for this annotation

updated_byintegerOptional

Last user who updated this annotation

parent_predictionintegerOptional

Points to the prediction from which this annotation was created

parent_annotationintegerOptional

Points to the parent annotation from which this annotation was created

last_created_byintegerOptional

User who created the last annotation history item

1	curl -X POST http://localhost:8080/api/tasks/1/annotations/ \
2	-H "Authorization: Token <api_key>" \
3	-H "Content-Type: application/json" \
4	-d '{
5	"result": [
6	{
7	"original_width": 1920,
8	"original_height": 1080,
9	"image_rotation": 0,
10	"from_name": "bboxes",
11	"to_name": "image",
12	"type": "rectanglelabels",
13	"value": {
14	"x": 20,
15	"y": 30,
16	"width": 50,
17	"height": 60,
18	"rotation": 0,
19	"values": {
20	"rectanglelabels": [
21	"Person"
22	]
23	}
24	}
25	}
26	],
27	"was_cancelled": false,
28	"ground_truth": true
29	}'

1	{
2	"id": 1,
3	"result": [
4	{
5	"original_width": 1920,
6	"original_height": 1080,
7	"image_rotation": 0,
8	"from_name": "bboxes",
9	"to_name": "image",
10	"type": "rectanglelabels",
11	"value": {
12	"x": 20,
13	"y": 30,
14	"width": 50,
15	"height": 60,
16	"rotation": 0,
17	"values": {
18	"rectanglelabels": [
19	"Person"
20	]
21	}
22	}
23	}
24	],
25	"created_username": "created_username",
26	"created_ago": "created_ago",
27	"completed_by": 1,
28	"unique_id": "unique_id",
29	"was_cancelled": false,
30	"ground_truth": false,
31	"created_at": "2024-01-15T09:30:00Z",
32	"updated_at": "2024-01-15T09:30:00Z",
33	"draft_created_at": "2024-01-15T09:30:00Z",
34	"lead_time": 10,
35	"import_id": 1,
36	"last_action": "prediction",
37	"task": 1,
38	"project": 1,
39	"updated_by": 1,
40	"parent_prediction": 1,
41	"parent_annotation": 1,
42	"last_created_by": 1
43	}

1	{
2	"result": {},
3	"was_cancelled": true,
4	"ground_truth": true,
5	"lead_time": 0,
6	"task": 0
7	"completed_by": 123
8	}