> ## Documentation Index
> Fetch the complete documentation index at: https://ngrok.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# List

> List all Certificate Authority on this account




## OpenAPI

````yaml https://raw.githubusercontent.com/ngrok/ngrok-openapi/refs/heads/main/ngrok.yaml get /certificate_authorities
openapi: 3.0.0
info:
  title: ngrok OpenAPI
  version: 1.0.0
servers:
  - url: https://api.ngrok.com
security:
  - authentication: []
paths:
  /certificate_authorities:
    get:
      tags:
        - CertificateAuthorities
      summary: List
      description: |
        List all Certificate Authority on this account
      operationId: CertificateAuthoritiesList
      parameters:
        - $ref: '#/components/parameters/ngrokVersion'
        - name: before_id
          description: >
            Expects a resource ID as its input. Returns earlier entries in the
            result set, sorted by ID.
          in: query
          required: false
          schema:
            type: string
        - name: limit
          description: >
            Constrains the number of results in the dataset. See the [API
            Overview](https://ngrok.com/docs/api/index#pagination) for details.
          in: query
          required: false
          schema:
            type: string
        - name: filter
          description: >
            A CEL expression to filter the list results. Supports logical and
            comparison operators to match on fields such as `id`, `metadata`,
            `created_at`, and more. See ngrok API Filtering for syntax and field
            details: https://ngrok.com/docs/api/api-filtering.
          in: query
          required: false
          schema:
            type: string
      responses:
        '200':
          description: |
            List all Certificate Authority on this account
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CertificateAuthorityList'
components:
  parameters:
    ngrokVersion:
      name: ngrok-version
      in: header
      required: true
      schema:
        type: integer
        default: 2
  schemas:
    CertificateAuthorityList:
      type: object
      properties:
        certificate_authorities:
          description: |
            the list of all certificate authorities on this account
          type: array
          items:
            $ref: '#/components/schemas/CertificateAuthority'
        uri:
          description: |
            URI of the certificates authorities list API resource
          type: string
        next_page_uri:
          description: |
            URI of the next page, or null if there is no next page
          type: string
    CertificateAuthority:
      type: object
      properties:
        id:
          description: |
            unique identifier for this Certificate Authority
          type: string
        uri:
          description: |
            URI of the Certificate Authority API resource
          type: string
        created_at:
          description: >
            timestamp when the Certificate Authority was created, RFC 3339
            format
          type: string
        description:
          description: >
            human-readable description of this Certificate Authority. optional,
            max 255 bytes.
          type: string
        metadata:
          description: >
            arbitrary user-defined machine-readable data of this Certificate
            Authority. optional, max 4096 bytes.
          type: string
        ca_pem:
          description: |
            raw PEM of the Certificate Authority
          type: string
        subject_common_name:
          description: |
            subject common name of the Certificate Authority
          type: string
        not_before:
          description: >
            timestamp when this Certificate Authority becomes valid, RFC 3339
            format
          type: string
        not_after:
          description: >
            timestamp when this Certificate Authority becomes invalid, RFC 3339
            format
          type: string
        key_usages:
          description: >
            set of actions the private key of this Certificate Authority can be
            used for
          type: array
          items:
            type: string
        extended_key_usages:
          description: >
            extended set of actions the private key of this Certificate
            Authority can be used for
          type: array
          items:
            type: string
  securitySchemes:
    authentication:
      type: http
      scheme: bearer

````