> ## Documentation Index
> Fetch the complete documentation index at: https://hexagraph-docs.voyla.in/llms.txt
> Use this file to discover all available pages before exploring further.
# Author
> Retrieve detailed metadata for a single researcher profile by its HX_A identifier.
Retrieves a single disambiguated researcher profile by its `HX_A` identifier. Profiles include output counts, citation totals, ORCID iDs, institutional affiliation history, topic expertise, and summary stats.
### Path Parameters
Unique author identifier (e.g. `HX_A5028125522`). Must be prefixed with `HX_A`.
### Response Fields
Unique author identifier prefixed with `HX_A` (e.g. `HX_A5028125522`).
ORCID profile and external identifiers.
ORCID iD number string.
Author full name on ORCID.
ORCID biography statement.
Email addresses array.
External authority IDs array.
External identifier value.
Identifier system name (e.g. `Scopus Author ID`).
External profile URL.
Author website links array.
Website URL.
Website display name.
ORCID recorded outputs count.
Author display name.
Author full name.
Total number of indexed publications authored by this researcher.
Total citation count across all authored publications.
Primary institutional affiliations.
Institution ID (`HX_I...`).
Institution display name.
ISO last updated timestamp.
ISO creation date timestamp.
Institutional affiliation history with years active.
Institution ID (`HX_I...`).
Institution display name.
Years active at this institution.
Aggregated impact metrics.
Two-year mean citation rate.
Calculated h-index score.
Calculated i10-index score.
Research topic expertise clusters.
Topic ID (`HX_T...`).
Topic name.
Outputs count for topic.
Topic output share proportion.
Outputs and citation metrics grouped by year.
Year number.
Outputs count in year.
Open Access outputs count in year.
Citations count in year.
Alternative display name strings array.
```bash cURL theme={null}
curl -X GET "https://api.hexagraph.in/authors/HX_A5028125522"
```
```javascript JavaScript theme={null}
fetch("https://api.hexagraph.in/authors/HX_A5028125522")
.then(response => response.json())
.then(data => console.log(data));
```
```python Python theme={null}
import requests
response = requests.get("https://api.hexagraph.in/authors/HX_A5028125522")
print(response.json())
```
```go Go theme={null}
package main
import (
"fmt"
"io"
"net/http"
)
func main() {
resp, err := http.Get("https://api.hexagraph.in/authors/HX_A5028125522")
if err != nil {
fmt.Println("Error:", err)
return
}
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))
}
```
```json 200 OK theme={null}
{
"id": "HX_A5028125522",
"orcid": {
"id": "0000-0001-5669-1937",
"name": "Tatsuya Kobayashi",
"biography": null,
"emails": null,
"externalIdentifiers": [
{
"id": "55578306300",
"name": "Scopus Author ID",
"url": "http://www.scopus.com/inward/authorDetails.url?authorID=55578306300&partnerID=MN8TOARS"
},
{
"id": "1000030733703",
"name": "Researcher Name Resolver ID",
"url": "https://nrid.nii.ac.jp/nrid/1000030733703/"
}
],
"websites": [
{
"url": "http://www.wanggenerator.com/",
"name": "http://www.wanggenerator.com/"
}
],
"outputs_count": 207
},
"name": "T. Kobayashi",
"full_name": "KOBAYASHI, Tatsuya",
"outputs_count": 2429356,
"cited_by_count": 3625,
"last_known_institutions": [
{
"id": "HX_I135598925",
"name": "Kyushu University"
},
{
"id": "HX_I150993360",
"name": "Hamamatsu Photonics (Japan)"
},
{
"id": "HX_I199525922",
"name": "National Institutes of Natural Sciences"
},
{
"id": "HX_I200475212",
"name": "The Graduate University for Advanced Studies, SOKENDAI"
},
{
"id": "HX_I4210108322",
"name": "National Institute for Fusion Science"
}
],
"updated_date": "2026-08-03T12:17:51",
"created_date": "2016-06-24T00:00:00",
"affiliations": [
{
"id": "HX_I109009565",
"name": "Dokkyo University",
"years": [
1992
]
},
{
"id": "HX_I112524849",
"name": "Yamagata University",
"years": [
2021
]
},
{
"id": "HX_I135598925",
"name": "Kyushu University",
"years": [
2026,
2025,
2024
]
}
],
"summary_stats": {
"2yr_mean_citedness": 0.000026759443716450348,
"h_index": 28,
"i10_index": 99
},
"topics": [
{
"id": "HX_T10346",
"name": "Magnetic confinement fusion research",
"count": 186,
"share": 0.000724
},
{
"id": "HX_T10159",
"name": "Ionosphere and magnetosphere dynamics",
"count": 122,
"share": 0.0002281
},
{
"id": "HX_T10251",
"name": "Solar and Space Plasma Dynamics",
"count": 53,
"share": null
}
],
"counts_by_year": [
{
"year": 1966,
"outputs_count": 1,
"oa_outputs_count": 0,
"cited_by_count": 0
},
{
"year": 1974,
"outputs_count": 1,
"oa_outputs_count": 0,
"cited_by_count": 37
},
{
"year": 1980,
"outputs_count": 1,
"oa_outputs_count": 0,
"cited_by_count": 0
},
{
"year": 1981,
"outputs_count": 1,
"oa_outputs_count": 0,
"cited_by_count": 0
},
{
"year": 1984,
"outputs_count": 1,
"oa_outputs_count": 0,
"cited_by_count": 2
}
],
"display_name_alternatives": [
"KOBAYASHI, Tatsuya",
"Kobayashi, T.",
"Kobayashi, Tatsuya",
"T Kobayashi",
"T. KOBAYASHI",
"T. Kobayashi",
"T.C. Kobayashi",
"TATSUYA KOBAYASHI",
"Tatsuya KOBAYASHI",
"Tatsuya Kobayashi"
]
}
```
```json 400 Bad Request theme={null}
{
"statusCode": 400,
"message": "Only HX_ prefixed IDs are allowed",
"error": "Bad Request"
}
```
```json 404 Not Found theme={null}
{
"statusCode": 404,
"message": "Author with ID HX_A9999999999 not found",
"error": "Not Found"
}
```
```json 429 Too Many Requests theme={null}
{
"statusCode": 429,
"error": "Too Many Requests",
"message": "IP rate limit exceeded (max 30 requests per minute). Please try again in 42 seconds (at 11:40:32 UTC).",
"reset_in_seconds": 42,
"reset_at_utc": "2026-08-05T11:40:32.000Z"
}
```