---
title: "Concepts for a given letter in the alphabetical index"
method: GET
path: "/{vocid}/index/{letter}"
tags: ["Vocabulary-specific methods"]
---

# Concepts for a given letter in the alphabetical index

`GET /{vocid}/index/{letter}`

Returns a list of the concepes which have a label (skos:prefLabel or skos:altLabel) starting with the given letter in the given language, or the default language of the vocabulary. The special value "0-9" matches labels starting with a number and the value "!*" matches labels starting with a special character.

## Path parameters

- `vocid` string, required
- `letter` string, required

## Query parameters

- `lang` string

## Response `200`

concepts of the alphabetical index

## Other responses

- `404` — no vocabulary could be found with the requested id

---

[API](https://skmtc.net/natlibfi/apis/skosmos-api.md) · [All operations](https://skmtc.net/natlibfi/apis/skosmos-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/natlibfi/skosmos-api/versions/1ad5811c7a3e/schema)