Categories

The Categories API provides CRUD access to categories, plus ancillary actions for assigning team members to a category and migrating a category’s resources into another category.

New to the API? Start with Getting started (base URL, response envelope, errors, pagination) and Authentication (API keys). Those conventions apply to every endpoint below and are not repeated here.

Identifier note: categories are addressed by their numeric category_id. Wherever {id} appears below it is the category_id.

The category object

All endpoints that return a category use this shape:

{
  "id": 3,
  "name": "Development",
  "description": "Software development work.",
  "type": "project",
  "visibility": "everyone",
  "icon": "ti ti-folder",
  "system_default": "no",
  "slug": "3-development",
  "count": 12,
  "users_count": 4,
  "dates": {
    "created": "2026-06-15T09:30:00.000000Z",
    "updated": "2026-06-15T09:30:00.000000Z"
  }
}

Field	Type	Notes
`id`	integer	Category id. Used in all URLs.
`name`	string	Category name.
`description`	string\|null	Category description.
`type`	string	Resource type the category belongs to (e.g. `project`, `client`, `ticket`, `invoice`, …). Set on create, immutable thereafter.
`visibility`	string\|null	Category visibility.
`icon`	string\|null	Icon class.
`system_default`	string	`yes` if this is a system-default category (cannot be deleted).
`slug`	string	URL slug (auto-generated).
`count`	integer	Number of resources of this category’s type currently in the category.
`users_count`	integer	Number of team members assigned to the category.
`dates`	object	`created`, `updated`.

List / search categories

GET /api/categories

Query parameters

Parameter	Type	Description
`type`	string	Filter by category type.
`visibility`	string	Filter by visibility.
`search`	string	Free-text search on the category name.
`sort`	string	`category_name`, `category_type`, `category_created`.
`order`	string	`asc` or `desc` (default `desc`).
`limit`	integer	Results per page (max 100).
`page`	integer	Page number.

Example request

curl -G https://your-domain/api/categories \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d type=project \
  -d limit=25

<?php
$query = http_build_query(['type' => 'project', 'limit' => 25]);
$ch = curl_init("https://your-domain/api/categories?$query");
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

Example response — `200 OK`

{
  "data": [ { "id": 3, "name": "Development", "type": "project" } ],
  "meta": { "current_page": 1, "per_page": 25, "total": 1, "last_page": 1 },
  "message": "Categories retrieved successfully."
}

Get a category

GET /api/categories/{id}

Example request

curl https://your-domain/api/categories/3 \
  -H "Authorization: Bearer YOUR_API_KEY"

<?php
$ch = curl_init('https://your-domain/api/categories/3');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

Returns the category (200) with message “Category retrieved successfully.”

Create a category

POST /api/categories

Body parameters

Parameter	Type	Required	Notes
`category_name`	string	yes	Must be unique within the same `category_type`.
`category_type`	string	yes	Resource type (e.g. `project`, `client`, `ticket`, …). Not changeable later.
`category_visibility`	string	no
`category_description`	string	no
`category_icon`	string	no	Icon class.

Example request

curl -X POST https://your-domain/api/categories \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d category_name="Development" \
  -d category_type=project

<?php
$ch = curl_init('https://your-domain/api/categories');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST           => true,
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
    CURLOPT_POSTFIELDS     => http_build_query([
        'category_name' => 'Development',
        'category_type' => 'project',
    ]),
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

Example response — `201 Created`

{
  "data": { "id": 3, "name": "Development", "type": "project" },
  "message": "Category created successfully."
}

Update a category

PATCH /api/categories/{id}

category_name is required and must be unique within the category’s type. category_type cannot be changed.

Body parameters

Parameter	Type	Required
`category_name`	string	yes
`category_visibility`	string	no
`category_description`	string	no
`category_icon`	string	no

Example request

curl -X PATCH https://your-domain/api/categories/3 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d category_name="Dev & Engineering"

<?php
$ch = curl_init('https://your-domain/api/categories/3');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST  => 'PATCH',
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
    CURLOPT_POSTFIELDS     => http_build_query(['category_name' => 'Dev & Engineering']),
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

Example response — `200 OK`

{
  "data": { "id": 3, "name": "Dev & Engineering", "type": "project" },
  "message": "Category updated successfully."
}

Delete a category

DELETE /api/categories/{id}

A category can only be deleted when it is empty (count is 0) and is not a system-default category. Otherwise a 409 is returned. To empty a non-empty category first, use the migrate action below. Deleting also removes the category’s team assignments.

Example request

curl -X DELETE https://your-domain/api/categories/3 \
  -H "Authorization: Bearer YOUR_API_KEY"

<?php
$ch = curl_init('https://your-domain/api/categories/3');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST  => 'DELETE',
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

Example response — `200 OK`

{
  "data": { "id": 3 },
  "message": "Category deleted successfully."
}

Set team members

PUT /api/categories/{id}/team

Sets the team members assigned to the category. The users array is the full set — it replaces any existing assignment; an empty array clears all. Category-based project permissions are re-synced automatically.

Parameter	Type	Required	Notes
`users`	array of integers	yes	Team user ids. Empty array clears all.

curl -X PUT https://your-domain/api/categories/3/team \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d "users[]=5" -d "users[]=8"

<?php
$ch = curl_init('https://your-domain/api/categories/3/team');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST  => 'PUT',
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
    CURLOPT_POSTFIELDS     => http_build_query(['users' => [5, 8]]),
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

Returns the category (200) with message “Category team updated successfully.”

Migrate resources

PUT /api/categories/{id}/migrate

Moves all of this category’s resources (projects, clients, invoices, estimates, leads, tickets, items, expenses, contracts) into another category, and re-syncs category-based project permissions. Use this to empty a category before deleting it. Returns the (now-emptied) source category.

Parameter	Type	Required	Notes
`target_id`	integer	yes	Destination category id. Must exist and differ from `{id}`.

curl -X PUT https://your-domain/api/categories/3/migrate \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d target_id=4

<?php
$ch = curl_init('https://your-domain/api/categories/3/migrate');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST  => 'PUT',
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
    CURLOPT_POSTFIELDS     => http_build_query(['target_id' => 4]),
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

Returns the source category (200) with message “Category resources migrated successfully.”

Errors

See Getting started for the shared error format. Category-specific:

Status	Meaning
`404 Not Found`	The category id does not exist.
`409 Conflict`	Cannot delete a system-default or non-empty category.
`422 Unprocessable Entity`	Validation failed (e.g. missing name/type, or a duplicate name within the type).

{
  "message": "The given data was invalid.",
  "errors": {
    "category_name": ["A category with this name already exists."],
    "category_type": ["The category type field is required."]
  }
}

Getting Started

Clients

Sales

Billing

Projects & Work

Support

Organization

Categories

Categories

The category object

List / search categories

Query parameters

Example request

Example response — `200 OK`

Get a category

Example request

Create a category

Body parameters

Example request

Example response — `201 Created`

Update a category

Body parameters

Example request

Example response — `200 OK`

Delete a category

Example request

Example response — `200 OK`

Set team members

Migrate resources

Errors

​Categories

​The category object

​List / search categories

​Query parameters

​Example request

​Example response — 200 OK

​Get a category

​Example request

​Create a category

​Body parameters

​Example request

​Example response — 201 Created

​Update a category

​Body parameters

​Example request

​Example response — 200 OK

​Delete a category

​Example request

​Example response — 200 OK

​Set team members

​Migrate resources

​Errors

Categories

The category object

List / search categories

Query parameters

Example request

Example response — `200 OK`

Get a category

Example request

Create a category

Body parameters

Example request

Example response — `201 Created`

Update a category

Body parameters

Example request

Example response — `200 OK`

Delete a category

Example request

Example response — `200 OK`

Set team members

Migrate resources

Errors