> ## Documentation Index > Fetch the complete documentation index at: https://docs.incident.io/llms.txt > Use this file to discover all available pages before exploring further. # Create > Create a custom field option. If the sort key is not supplied, it'll default to 1000, so the option appears near the end of the list. ## OpenAPI ````yaml /openapi/tags/custom-field-options-v1.json post /v1/custom_field_options openapi: 3.0.3 info: description: "This is the API reference for incident.io.\n\nIt documents available API endpoints, provides examples of how to use it, and\ninstructions around things like authentication and error handling.\n\nThe API is hosted at:\n\n- https://api.incident.io/\n\nAnd you will need to create an API key via your [incident.io\ndashboard](https://app.incident.io/settings/api-keys) to make requests.\n\n# Making requests\n\nHere are the key concepts required to make requests to the incident.io API.\n\n## Authentication\n\nFor all requests made to the incident.io API, you'll need an API key.\n\nTo create an API key, head to the incident dashboard and visit [API\nkeys](https://app.incident.io/settings/api-keys). When you create the key, you'll be able to choose what actions it\ncan take for your account: choose carefully, as those roles can only be set\nwhen you first create the key. We'll only show you the token once, so make sure\nyou store it somewhere safe.\n\nAPI keys are global to your incident.io account, and can be managed by anyone\nwho has the right permissions. We display the user that created the API key,\nand the API key will remain valid if that user becomes deactivated.\n\nOnce you have the key, you should make requests to the API that set the\n`Authorization` request header using a \"Bearer\" authentication scheme:\n\n```\nAuthorization: Bearer \n```\n\n## Rate Limits\n\nThe incident.io API enforces rate limits to ensure consistent performance for all users.\n\nThe default rate limit is 1200 requests/minute per API key. This limit applies to most endpoints across the API.\n\nSome endpoints have lower rate limits, particularly those that interact with external third-party systems that impose\ntheir own limitations. These specific limits vary by endpoint, and we recommend relying on the rate-limit error\nresponses to understand usage patterns and implement appropriate retry strategies.\n\nWhen you exceed a rate limit, the API will respond with a `429 Too Many Requests` status code, along with a JSON\nresponse that includes information about the limit and when you can retry:\n\n```json\n{\n \"type\": \"too_many_requests\",\n \"status\": 429,\n \"request_id\": \"b839a403-7704-41c1-bf6a-39a2d68caefa\",\n \"rate_limit\": {\n \"name\": \"api_key_name\",\n \"limit\": 1200,\n \"remaining\": 0,\n \"retry_after\": \"Thu, 17 Apr 2025 11:17:18 UTC\"\n },\n \"errors\": [\n {\n \"code\": \"too_many_requests\",\n \"message\": \"Too many requests hit the API too quickly. We recommend an exponential backoff of your requests.\"\n }\n ]\n}\n```\n\nThe response includes:\n* The name of the API key (`name`)\n* The bucket limit (`limit`)\n* The number of requests remaining (`remaining`)\n* When you can retry requests (`retry_after`)\n\n## Errors\n\nWe use standard HTTP response codes to indicate the status or failure of API\nrequests.\n\nThe API response body will be JSON, and contain more detailed information on the\nnature of the error.\n\nAn example error when a request is made without an API key:\n\n```json\n{\n \"type\": \"authentication_error\",\n \"status\": 401,\n \"request_id\": \"8e3cc412-b49d-4957-9073-2c19d2c61804\",\n \"errors\": [\n {\n \"code\": \"missing_authorization_material\",\n \"message\": \"No authorization material provided in request\"\n }\n ]\n}\n```\n\nNote that the error:\n\n- Contains the HTTP status (`401`)\n- References the type of error (`authentication_error`)\n- Includes a `request_id` that can be provided to incident.io support to help\n\tdebug questions with your API request\n- Provides a list of individual errors, which go into detail about why the error\n\toccurred\n\nThe most common error will be a 422 Validation Error, which is returned when the\nrequest was rejected due to failing validations.\n\nThese errors look like this:\n\n```json\n{\n \"type\": \"validation_error\",\n \"status\": 422,\n \"request_id\": \"631766c4-4afd-4803-997c-cd700928fa4b\",\n \"errors\": [\n {\n \"code\": \"is_required\",\n \"message\": \"A severity is required to open an incident\",\n \"source\": {\n \"field\": \"severity_id\"\n }\n }\n ]\n}\n```\n\nThis error is caused by not providing a severity identifier, which should be at\nthe `severity_id` field of the request payload. Errors like these can be mapped to\nforms, should you be integrating with the API from a user-interface.\n\n## Compatibility\n\nWe won't make breaking changes to existing API services or endpoints, but will\nexpect integrators to upgrade themselves to the latest API endpoints within 3\nmonths of us deprecating the old service.\n\nWe will make changes that are considered backwards compatible, which include:\n\n- Adding new API endpoints and services\n- Adding new properties to responses from existing API endpoints\n- Reordering properties returned from existing API endpoints\n- Adding optional request parameters to existing API endpoints\n- Altering the format or length of IDs\n- Adding new values to enums\n\nIt is important that clients are robust to these changes, to ensure reliable\nintegrations.\n\nAs an example, if you are generating a client using an openapi-generator, ensure\nthe generated client is configured to support unknown enum values, often\nconfigured via the `enumUnknownDefaultCase` parameter.\n\nWhen breaking changes are unavoidable, we'll create a new service version on a\nseparate path, and run them in parallel.\n\nFor example:\n\n- https://api.incident.io/v1/incidents\n- https://api.incident.io/v2/incidents\n\nFor any questions, email support@incident.io.\n" title: incident.io version: 1.0.0 servers: - url: https://api.incident.io security: - BearerAuth: [] tags: - description: >- Manage custom field options. Single- and multi-select custom fields have a list of all available options, which have a value, and a sort key. The value must be unique to the custom field. For example, you might have an Incident Type custom field, with options "Data breach", "Performance degradation", "API downtime", etc. name: Custom Field Options V1 paths: /v1/custom_field_options: post: tags: - Custom Field Options V1 summary: Create description: >- Create a custom field option. If the sort key is not supplied, it'll default to 1000, so the option appears near the end of the list. operationId: Custom Field Options V1_Create requestBody: content: application/json: example: custom_field_id: 01FCNDV6P870EA6S7TK1DSYDG0 sort_key: 10 value: Product schema: $ref: '#/components/schemas/CustomFieldOptionsCreatePayloadV1' required: true responses: '201': content: application/json: example: custom_field_option: custom_field_id: 01FCNDV6P870EA6S7TK1DSYDG0 id: 01FCNDV6P870EA6S7TK1DSYDG0 sort_key: 10 value: Product schema: $ref: '#/components/schemas/CustomFieldOptionsCreateResultV1' description: Created response. components: schemas: CustomFieldOptionsCreatePayloadV1: example: custom_field_id: 01FCNDV6P870EA6S7TK1DSYDG0 sort_key: 10 value: Product properties: custom_field_id: description: ID of the custom field this option belongs to example: 01FCNDV6P870EA6S7TK1DSYDG0 type: string sort_key: default: 1000 description: Sort key used to order the custom field options correctly example: 10 format: int64 type: integer value: description: >- Human readable name for the custom field option. Values must not start or end with whitespace, or contain tabs or newlines. example: Product type: string required: - custom_field_id - value type: object CustomFieldOptionsCreateResultV1: example: custom_field_option: custom_field_id: 01FCNDV6P870EA6S7TK1DSYDG0 id: 01FCNDV6P870EA6S7TK1DSYDG0 sort_key: 10 value: Product properties: custom_field_option: $ref: '#/components/schemas/CustomFieldOptionV1' required: - custom_field_option type: object CustomFieldOptionV1: properties: custom_field_id: description: ID of the custom field this option belongs to example: 01FCNDV6P870EA6S7TK1DSYDG0 type: string id: description: Unique identifier for the custom field option example: 01FCNDV6P870EA6S7TK1DSYDG0 type: string sort_key: default: 1000 description: Sort key used to order the custom field options correctly example: 10 format: int64 type: integer value: description: >- Human readable name for the custom field option. Values must not start or end with whitespace, or contain tabs or newlines. example: Product type: string required: - id - custom_field_id - value - sort_key type: object securitySchemes: BearerAuth: type: http scheme: bearer description: API key from your incident.io dashboard (Settings → API keys) ````