List topics

GET

topics

curl -X GET "https://api.hexagraph.in/topics?sort=outputs_count:desc&per_page=10"

fetch("https://api.hexagraph.in/topics?sort=outputs_count:desc&per_page=10")
  .then(response => response.json())
  .then(data => console.log(data));

import requests

response = requests.get("https://api.hexagraph.in/topics", params={"sort": "outputs_count:desc", "per_page": 10})
print(response.json())

{
  "meta": {
    "count": 4516,
    "page": 1,
    "per_page": 25
  },
  "results": [
    {
      "id": "HX_T14423",
      "name": "Military Technology and Strategies",
      "description": "This cluster of papers covers various aspects related to the modernization and development of air force capabilities, including the use of unmanned aerial vehicles, radar systems, military communication, electronic components, and strategic planning. It also explores the intersection of strategic planning, foresight, and design in the context of air force modernization.",
      "keywords": [
        "Air Force",
        "Modernization",
        "Warfare",
        "Unmanned Aerial Vehicles",
        "Radar Systems",
        "Military Communication",
        "Electronic Components",
        "Strategic Planning",
        "Foresight",
        "Design"
      ],
      "ids": {
        "wikipedia": "https://en.wikipedia.org/wiki/Air_force_modernization"
      },
      "subfield": {
        "id": "2202",
        "name": "Aerospace Engineering"
      },
      "field": {
        "id": "22",
        "name": "Engineering"
      },
      "domain": {
        "id": "3",
        "name": "Physical Sciences"
      },
      "siblings": [
        {
          "id": "HX_T10069",
          "name": "Antenna Design and Analysis"
        },
      ],
      "outputs_count": 22344034,
      "cited_by_count": 843046,
      "updated_date": "2026-08-05T03:01:31",
      "created_date": "2024-01-23T15:27:22"
    }
  ]
}

{
  "statusCode": 400,
  "message": "Bad Request - Invalid query parameters",
  "error": "Bad Request"
}

{
  "statusCode": 429,
  "message": "Rate limit exceeded. Maximum 30 requests per minute.",
  "error": "Too Many Requests"
}

Retrieves a paginated list of research topics with filtering and sorting capabilities.

Query Parameters

integer

default:"1"

Page number for pagination. Default is 1.

integer

default:"25"

Results per page. Allowed values: 10, 25, 50, 100.

string

Filter expression (e.g. domain.id:3).

string

Sorting parameter (e.g. outputs_count:desc, cited_by_count:desc).

Response Fields

object

required

Pagination metadata.

Show meta attributes

integer

Total matching records count.

integer

Current page number.

integer

Items per page.

array

required

Array of topic records.

Show results item attributes

string

Topic ID (HX_T...).

string

Topic display name.

string

Scope description.

array

Associated keyword strings array.

object

External identifiers.

Show ids attributes

string

Wikipedia URL.

object

Parent subfield.

Show subfield attributes

string

Subfield numeric ID.

string

Subfield display name.

object

Parent field.

Show field attributes

string

Field numeric ID.

string

Field display name.

object

Parent domain.

Show domain attributes

string

Domain numeric ID.

string

Domain display name.

array

Sibling topic clusters.

Show siblings attributes

string

Sibling topic ID (HX_T...).

string

Sibling topic display name.

integer

Outputs count.

integer

Citations count.

string

Last updated timestamp.

string

Creation timestamp.

curl -X GET "https://api.hexagraph.in/topics?sort=outputs_count:desc&per_page=10"

fetch("https://api.hexagraph.in/topics?sort=outputs_count:desc&per_page=10")
  .then(response => response.json())
  .then(data => console.log(data));

import requests

response = requests.get("https://api.hexagraph.in/topics", params={"sort": "outputs_count:desc", "per_page": 10})
print(response.json())

{
  "meta": {
    "count": 4516,
    "page": 1,
    "per_page": 25
  },
  "results": [
    {
      "id": "HX_T14423",
      "name": "Military Technology and Strategies",
      "description": "This cluster of papers covers various aspects related to the modernization and development of air force capabilities, including the use of unmanned aerial vehicles, radar systems, military communication, electronic components, and strategic planning. It also explores the intersection of strategic planning, foresight, and design in the context of air force modernization.",
      "keywords": [
        "Air Force",
        "Modernization",
        "Warfare",
        "Unmanned Aerial Vehicles",
        "Radar Systems",
        "Military Communication",
        "Electronic Components",
        "Strategic Planning",
        "Foresight",
        "Design"
      ],
      "ids": {
        "wikipedia": "https://en.wikipedia.org/wiki/Air_force_modernization"
      },
      "subfield": {
        "id": "2202",
        "name": "Aerospace Engineering"
      },
      "field": {
        "id": "22",
        "name": "Engineering"
      },
      "domain": {
        "id": "3",
        "name": "Physical Sciences"
      },
      "siblings": [
        {
          "id": "HX_T10069",
          "name": "Antenna Design and Analysis"
        },
      ],
      "outputs_count": 22344034,
      "cited_by_count": 843046,
      "updated_date": "2026-08-05T03:01:31",
      "created_date": "2024-01-23T15:27:22"
    }
  ]
}

{
  "statusCode": 400,
  "message": "Bad Request - Invalid query parameters",
  "error": "Bad Request"
}

{
  "statusCode": 429,
  "message": "Rate limit exceeded. Maximum 30 requests per minute.",
  "error": "Too Many Requests"
}

curl -X GET "https://api.hexagraph.in/topics?sort=outputs_count:desc&per_page=10"

fetch("https://api.hexagraph.in/topics?sort=outputs_count:desc&per_page=10")
  .then(response => response.json())
  .then(data => console.log(data));

import requests

response = requests.get("https://api.hexagraph.in/topics", params={"sort": "outputs_count:desc", "per_page": 10})
print(response.json())

{
  "meta": {
    "count": 4516,
    "page": 1,
    "per_page": 25
  },
  "results": [
    {
      "id": "HX_T14423",
      "name": "Military Technology and Strategies",
      "description": "This cluster of papers covers various aspects related to the modernization and development of air force capabilities, including the use of unmanned aerial vehicles, radar systems, military communication, electronic components, and strategic planning. It also explores the intersection of strategic planning, foresight, and design in the context of air force modernization.",
      "keywords": [
        "Air Force",
        "Modernization",
        "Warfare",
        "Unmanned Aerial Vehicles",
        "Radar Systems",
        "Military Communication",
        "Electronic Components",
        "Strategic Planning",
        "Foresight",
        "Design"
      ],
      "ids": {
        "wikipedia": "https://en.wikipedia.org/wiki/Air_force_modernization"
      },
      "subfield": {
        "id": "2202",
        "name": "Aerospace Engineering"
      },
      "field": {
        "id": "22",
        "name": "Engineering"
      },
      "domain": {
        "id": "3",
        "name": "Physical Sciences"
      },
      "siblings": [
        {
          "id": "HX_T10069",
          "name": "Antenna Design and Analysis"
        },
      ],
      "outputs_count": 22344034,
      "cited_by_count": 843046,
      "updated_date": "2026-08-05T03:01:31",
      "created_date": "2024-01-23T15:27:22"
    }
  ]
}

{
  "statusCode": 400,
  "message": "Bad Request - Invalid query parameters",
  "error": "Bad Request"
}

{
  "statusCode": 429,
  "message": "Rate limit exceeded. Maximum 30 requests per minute.",
  "error": "Too Many Requests"
}

Overview

REST Endpoints

GraphQL

Query Parameters

Response Fields

​Query Parameters

​Response Fields

Query Parameters

Response Fields