> ## Documentation Index
> Fetch the complete documentation index at: https://developer.lemlist.com/llms.txt
> Use this file to discover all available pages before exploring further.
> Modifies aspects of an existing task including assignment, scheduling, and status.
# Update Task
export const SnippetObjectReference = ({objectName, objectPath = null}) => {
const lowerCaseObjectName = objectName.toLowerCase();
if (lowerCaseObjectName === 'lead' || lowerCaseObjectName === 'leads') {
return
This endpoint uses the {objectName} object. Make sure to also check the {lowerCaseObjectName === 'lead' ? 'Contact' : 'Lead'} object to understand the distinction between the two.
;
}
return
This endpoint uses the {objectName} object.
;
};
## Updatable Fields
All fields are optional except `id`:
* **Assignment**: Change the assigned team member with `assignedTo`
* **Schedule**: Update the `dueDate`
* **Details**: Modify `title` or `message` content
* **Priority**: Set priority level (0=low, 1=medium, 2=high, ""=none)
* **Status**: Mark as complete with `done: true`
* **LinkedIn media** (LinkedIn tasks only): Replace attached files via `images` and `videos`. Pass an empty array to clear them. See the [LinkedIn task attachments](/api-reference/endpoints/tasks/create-task#linkedin-task-attachments) section on Create Task for size, MIME, and count limits
Passing `images` or `videos` to a non-LinkedIn task returns `400` with `LINKEDIN_MEDIA_INVALID_TYPE`.
Examples:
```json mark as done theme={"theme":"dracula"}
{
"id": "opp_abc123",
"done": true
}
```
```json reassign and reschedule: theme={"theme":"dracula"}
{
"id": "opp_abc123",
"assignedTo": "usr_xyz789",
"dueDate": "2025-03-15T10:00:00.000Z"
}
```
```json attach LinkedIn media theme={"theme":"dracula"}
{
"id": "opp_abc123",
"images": [
"https://example.com/assets/overview.png"
],
"videos": []
}
```
## OpenAPI
````yaml patch /tasks
openapi: 3.0.0
info:
title: lemlist API
version: 1.0.0
description: >-
Welcome to the lemlist Developer Documentation.
lemlist is very customizable and open. You'll find on this page all the API
and integration you can do with lemlist.
# Rate Limit
lemlist's API rate limits requests in order to prevent abuse and overload of
our services.
Rate limits are applied on all routes and per API key performing the
request.
The rate limits are **20** requests per **2** seconds.
The response provides any information you may need about it:
| Header | Description |
| --- | --- |
| Retry-After | The number of seconds in which you can retry |
| X-RateLimit-Limit | The maximum requests in that time |
| X-RateLimit-Remaining | The number of remaining requests you can make |
| X-RateLimit-Reset | The date when the rate limit will reset |
_Example of values for the rate limit headers_
``` json
{
"Retry-After": 2,
"X-RateLimit-Limit": 20,
"X-RateLimit-Remaining": 7,
"X-RateLimit-Reset" : "Tue Feb 16 2021 09:02:42 GMT+0100 (Central European Standard Time)"
}
```
# Definitions
## Team
A team is the entity of lemlist that can handle users and billing.
## Credits
Credits are the coins a team uses to enrich emails, LinkedIn URLs, etc. via
the enrich route. Each enrichment feature needs a certain amount of credits
to run.
## User
You use a user account to connect to lemlist and send messages via the
connected emails or LinkedIn account.
## Campaign
A campaign is the entity to automate outreach. A campaign has multiple
sequences composed of steps.
## Lead
A lead is a person that you try to contact via a campaign.
## Activity
An activity is the history of all the steps.
## Unsubscribe
An unsubscribe occurs when a person decides they don't want to receive
emails from you anymore.
# Authentication
All API routes use the dedicated subdomain `api.lemlist.com`.
lemlist uses API keys to allow access to the API. You can get your lemlist
API key at our [integration
page](https://app.lemlist.com/settings/integrations).
You need to add the `Authorization` header using the `Basic` authentication
type. `login:password` **where the login is always empty and the password is
the API key**.
⚠️ **Don't forget to add the semicolon (**`:`**) before your API key in curl
command.**
> To authorize, use this code:
``` shell
curl https://api.lemlist.com/api/team \
--user ":YourApiKey"
```
**Make sure to replace** **`YourApiKey`** **with your API key.**
# Give feedback
If you want to report a bug, ask for data, or share with us a use case,
please fill this [form](https://lemlist.typeform.com/to/mfVlkyGf). It will
help us centralize your needs!
servers:
- url: https://api.lemlist.com/api
security:
- basicAuth: []
paths:
/tasks:
patch:
tags:
- Tasks
summary: Update Task
description: >-
Update task details such as assignment, due date, title, message,
priority, or completion status.
parameters: []
requestBody:
content:
application/json:
schema:
type: object
properties:
id:
type: string
description: The unique identifier of the task to update
assignedTo:
type: string
description: The ID of the team member to assign the task to (userId)
dueDate:
type: string
format: date-time
description: Updated due date in ISO 8601 format
title:
type: string
description: Updated task title
message:
type: string
description: Updated task message/description
priority:
type: string
description: Priority level of the task
enum:
- ''
- '0'
- '1'
- '2'
done:
type: boolean
description: Mark task as completed
images:
type: array
items:
type: string
format: uri
description: >-
Public HTTPS URLs of images to attach to a LinkedIn task.
Replaces the task's current images — pass an empty array to
clear them. Returns `400` (`LINKEDIN_MEDIA_INVALID_TYPE`)
when the target task is not a LinkedIn task. Allowed MIME
types: `image/png`, `image/jpeg`, `image/gif`. Up to 20 MB
per file, and up to 6 items total combined with `videos`.
videos:
type: array
items:
type: string
format: uri
description: >-
Public HTTPS URLs of videos to attach to a LinkedIn task.
Replaces the task's current videos — pass an empty array to
clear them. Returns `400` (`LINKEDIN_MEDIA_INVALID_TYPE`)
when the target task is not a LinkedIn task. Allowed MIME
types: `video/mp4`, `video/quicktime`. Up to 20 MB per file,
and up to 6 items total combined with `images`.
required:
- id
example:
id: opp_0Ieq2qRMg5EIeUMFV
title: My new title
responses:
'200':
description: Success
content:
application/json:
schema:
$ref: '#/components/schemas/Task'
example:
_id: opp_KNQOrrlGnLvEXDDS9
type: manual
title: Check him out
priority: 2
dueDate: '2025-10-31T07:58:00.000Z'
userId: usr_ahfFktBBHUIxbVG5P
content: Really glad we started using lemlist
'400':
description: 'Possible errors: Bad team / Bad method'
content:
text/plain:
example: Bad team
'401':
description: The authentication you supplied is incorrect
content:
text/plain:
example: The authentication you supplied is incorrect
'405':
description: Method not allowed
components:
schemas:
Task:
type: object
description: A manual action assigned to a user to complete.
properties:
_id:
type: string
description: Unique task identifier
type:
type: string
description: Task type
leadId:
type: string
description: Associated lead ID
campaignId:
type: string
description: Campaign ID
userId:
type: string
description: Assigned user ID
status:
type: string
description: Task status
enum:
- pending
- completed
- ignored
dueDate:
type: string
format: date-time
description: Due date timestamp
createdAt:
type: string
format: date-time
description: Creation timestamp
completedAt:
type: string
format: date-time
description: Completion timestamp
securitySchemes:
basicAuth:
type: http
scheme: basic
````