# /kegg/entries

`POST /api/kegg/entries`

Price: 20 credits

Get KEGG entries by identifier, across genes, pathways, compounds, drugs, diseases and enzymes

## How to use it

The identifier carries its own database, so `C00031` is a compound and `hsa:7157` is a human gene - pass the id as KEGG writes it. A database prefix such as `cpd:`, `dr:`, `path:` or `ec:` is optional and returns the same record as the bare id, while an organism gene keeps its organism code. Ask for several entries in one call rather than looping: they are fetched together. Which fields come back depends entirely on the database, so read `fields` for anything the typed fields do not carry - a compound has no `symbols` and a gene has no `formula`, and neither case is missing data. An id KEGG does not know is dropped from the answer rather than failing the call, so compare what you asked for against `id`.

## Parameters

- `access-token` (string, required)

## Request body

- `timeout` (integer) — Max scrapping execution timeout (in seconds) (default: 300; min: 20; max: 1500)
- `entries` (array, required) — KEGG entry identifiers, database-prefixed where the database is not part of the id itself (examples: ["hsa:7157"], ["C00031","D00009"], ["hsa05210","map05210","ec:2.7.11.1"]; minItems: 1; maxItems: 100)
- `count` (integer, required) — Max number of results (min: 1; max: 100)

## Response

### 200 — Successful Response

- `@type` (string) (default: "KeggEntry")
- `id` (string, required)
- `database` (string) (default: "")
- `entry_code` (string) (default: "")
- `entry_kind` (string) (default: "")
- `names` (array) (default: [])
- `definition` (string) (default: "")
- `description` (string) (default: "")
- `formula` (string) (default: "")
- `exact_mass` (number, nullable)
- `mol_weight` (number, nullable)
- `organism` (string) (default: "")
- `organism_name` (string) (default: "")
- `symbols` (array) (default: [])
- `classes` (array) (default: [])
- `position` (string) (default: "")
- `pathways` (array) (default: [])
  - `@type` (string) (default: "KeggRef")
  - `id` (string, required)
  - `name` (string) (default: "")
- `modules` (array) (default: [])
  - `@type` (string) (default: "KeggRef")
  - `id` (string, required)
  - `name` (string) (default: "")
- `diseases` (array) (default: [])
  - `@type` (string) (default: "KeggRef")
  - `id` (string, required)
  - `name` (string) (default: "")
- `drugs` (array) (default: [])
  - `@type` (string) (default: "KeggRef")
  - `id` (string, required)
  - `name` (string) (default: "")
- `networks` (array) (default: [])
  - `@type` (string) (default: "KeggRef")
  - `id` (string, required)
  - `name` (string) (default: "")
- `orthology` (array) (default: [])
  - `@type` (string) (default: "KeggRef")
  - `id` (string, required)
  - `name` (string) (default: "")
- `db_links` (array) (default: [])
  - `@type` (string) (default: "KeggDbLink")
  - `database` (string, required)
  - `ids` (array) (default: [])
- `literature_references` (array) (default: [])
  - `@type` (string) (default: "KeggLiteratureReference")
  - `reference` (string) (default: "")
  - `authors` (string) (default: "")
  - `article_title` (string) (default: "")
  - `journal` (string) (default: "")
- `fields` (array) (default: [])
  - `@type` (string) (default: "KeggField")
  - `name` (string, required)
  - `lines` (array) (default: [])
  - `subfields` (array) (default: [])
    - `@type` (string) (default: "KeggSubField")
    - `name` (string, required)
    - `lines` (array) (default: [])
- `url` (string) (default: "")

## Errors

### 422 — Validation Error

Malformed identifier

What to do: Check the fields against this schema. A URN with the wrong prefix is the most common cause.

- `detail` (array)
  - `loc` (array, required)
  - `msg` (string, required)
  - `type` (string, required)
  - `input` (any)
  - `ctx` (object)

### 408

The request ran past its time limit

What to do: Raise `timeout` in the request body, up to the maximum this endpoint documents. Lowering `count` or turning off the `with_*` flags also helps, because less work finishes sooner.

### 412

No entry found

What to do: Retrying will not help: either the entity does not exist, or the input points at a different one.

### 429

Too many requests: a rate limit or a usage window is exhausted

What to do: When the response carries an X-Retry-After header, wait that many seconds and retry: the same number is in the body as `detail.retry_after`, and the limit clears once that window passes. The message in the body names the limit that was hit.

### 500

Something broke on our side

What to do: Retrying will not help. If it keeps happening, send us the X-Request-ID from the response headers.

### 529

Rate limit reached, or the endpoint is overloaded

What to do: Wait at least 30 seconds, then retry.

## Response envelope

Success: Array of objects (may be empty if no results)

Error: Error may coexist with partial results if it occurs mid-execution. Check X-Error header and status code.

Every response carries these headers:

- `X-Error` — Error message text (present only on error)
- `X-Request-ID` — Unique request identifier
- `X-Execution-Time` — Execution time in seconds
- `X-Result-Count` — How many records the body carries. 0 means an empty result, which is a normal answer and not by itself an error. A non-zero count can come back together with X-Error when the failure happened partway through — read this header and X-Error independently.
- `X-Total-Available-Results` — How many records exist for this query, when the endpoint can say. On a `dry_run` request this is the answer and the body is empty. It saturates: the endpoint's documented maximum means 'at least that many', any smaller number is exact.
- `X-Warning` — Present when the request body carried keys this endpoint does not document. They were ignored, so any filter you meant to apply through them did not apply. Check the spelling against this schema and retry.
- `X-Retry-After` — Seconds to wait before retrying. Present only on 429.