---
title: "Autocomplete a query prefix"
method: GET
path: "/api/search/autocomplete"
---

# Autocomplete a query prefix

`GET /api/search/autocomplete`

## Request

- Base URL: `https://api.reletter.com`
- URL: `https://api.reletter.com/api/search/autocomplete`
- Auth: API key in header `x-reletter-api-key`

Type-ahead suggestions for a partial query.

## Query parameters

- `query` string, required
- `mode` 'topics' | 'titles' | 'authors' | 'issues', required

## Response `200`

Success.

## Other responses

- `400`: Validation error, or quota exhausted (`code: bundle_exhausted`).
- `401`: API key is missing, unknown or inactive.
- `429`: Burst limit exceeded (`api_rate_limited`).

---

[API](https://skmtc.dev/reletter/apis/reletter-api.md) · [All operations](https://skmtc.dev/reletter/apis/reletter-api/llms.txt) · [OpenAPI document](https://skmtc.dev/reletter/apis/reletter-api/revisions/51db96682bd0?raw)