> ## Documentation Index > Fetch the complete documentation index at: https://docs.mangrovesystems.com/llms.txt > Use this file to discover all available pages before exploring further. # Create a project's configuration > Creates a nexus config for a project. Idempotent - returns 200 if config already exists. Requires the `write:project` token scope. ## OpenAPI ````yaml POST /projects/{project_id}/nexus_config openapi: 3.1.0 info: title: Mangrove - API version: 1.1.0 description: > ## Filtering and sorting List endpoints that accept `filter` take one query parameter per condition, written `filter[field][comparator]=value`, for example `filter[name][contains]=North`. The comparators are `eq`, `neq`, `gt`, `geq`, `lt`, `leq` and `contains`, and `filter[field]=value` is short for `eq`. Conditions combine with AND. `contains` matches part of the value, is case-sensitive, and applies only to text fields. An unknown field or comparator, a value that doesn't fit the field's type, or a list or object as the value returns 400 with a message naming the problem. Each list operation names its filterable fields; some take only `eq`, and say so. `sort` takes a comma-separated list of fields, for example `sort=-created_at,name`. Each field sorts ascending, or descending with a `-` prefix. Unknown sort fields are ignored. Sorting by `id` orders by the record's internal ID, not its friendly ID. Each list operation names its sortable fields. servers: - url: https://app.gomangrove.com/api/v1 security: - sec0: [] paths: /projects/{project_id}/nexus_config: post: summary: Create nexus config description: >- Creates a nexus config for a project. Idempotent - returns 200 if config already exists. Requires the `write:project` token scope. operationId: create-nexus-config parameters: - $ref: '#/components/parameters/ProjectId' responses: '200': description: The project already has a nexus config, which is returned unchanged. content: application/json: example: id: 1 project_id: prj_aBcD1234eFgH5678 event_type_count: 3 data_point_type_count: 15 ledger_count: 2 created_at: '2025-01-15T10:00:00.000Z' updated_at: '2025-01-15T10:00:00.000Z' ui_url: https://app.gomangrove.com/nexus/prj_aBcD1234eFgH5678 schema: $ref: '#/components/schemas/NexusConfig' '201': description: The created nexus config. content: application/json: example: id: 1 project_id: prj_aBcD1234eFgH5678 event_type_count: 0 data_point_type_count: 0 ledger_count: 0 created_at: '2025-01-15T10:00:00.000Z' updated_at: '2025-01-15T10:00:00.000Z' ui_url: https://app.gomangrove.com/nexus/prj_aBcD1234eFgH5678 schema: $ref: '#/components/schemas/NexusConfig' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' '422': description: 422 - The config could not be created content: application/json: example: errors: - message: Project already has a Nexus config field: project_id code: taken schema: $ref: '#/components/schemas/ErrorResponse' components: parameters: ProjectId: name: project_id in: path required: true description: The project's friendly ID (e.g. `prj_aBcD1234eFgH5678`). schema: type: string schemas: NexusConfig: type: object properties: id: type: integer project_id: type: string description: The project's friendly ID (e.g. `prj_aBcD1234eFgH5678`). example: prj_aBcD1234eFgH5678 event_type_count: type: integer data_point_type_count: type: integer ledger_count: type: integer created_at: type: string format: date-time updated_at: type: string format: date-time ui_url: type: string format: uri description: >- Link that opens this project in the Mangrove app. The nexus config has no page of its own. example: https://app.gomangrove.com/nexus/prj_aBcD1234eFgH5678 ErrorResponse: type: object required: - errors properties: errors: type: array items: type: object required: - message properties: message: type: string description: Human-readable error message field: type: string description: Attribute the error applies to (validation errors only) code: type: string description: Machine-readable error code (validation errors only) blocking: type: array description: >- Bounded preview of the records blocking a destroy (blocked-destroy errors only) items: $ref: '#/components/schemas/DeletionBlockingRecord' blocking_count: type: integer description: >- Total count of records blocking a destroy (blocked-destroy errors only) config_key: type: string description: >- The data feed source config setting to fix, when the error is on `config` (data feed source validation errors only) count: type: number description: >- The limit or comparison value the failed validation checked against, e.g. a maximum length or a numeric bound (validation errors only, when the validation has one) value: description: >- The rejected value, e.g. on an inclusion or uniqueness failure (validation errors only, when the validation reports one) DeletionBlockingRecord: type: object required: - type properties: type: type: string friendly_id: type: string name: type: - string - 'null' description: >- Display label, and the only identifier for records that have no friendly_id responses: Unauthorized: description: >- The API token is missing, invalid or expired. The body is empty, except for an expired token, which returns the error below. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: errors: - message: API token has expired Forbidden: description: >- The token lacks the scope the operation's description names, or a condition the description states applies, such as a feature that isn't enabled for your account. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: errors: - message: You are not authorized to perform this action NotFound: description: >- A resource named in the path doesn't exist in your account, or the token can't see it. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: errors: - message: Record not found securitySchemes: sec0: type: apiKey in: header name: Authorization x-bearer-format: '' ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.