---
title: "Lookup a collection"
method: GET
path: "/v1/collections/{collection_id}"
tags: ["Collections"]
---

# Lookup a collection

`GET /v1/collections/{collection_id}`

Retrieves details about a collection, including the `schema` and `name`. This request does not include the `content` of the collection (the values associated with keys in the schema).

## Response `200`

Returns metadata about your collection.

- object
  - `collection` CollectionResponse
    - `bytes` integer — The size of the collection in bytes.
    - `created_at` integer — The date time when the referenced ID was created.
    - `updated_at` integer — The date time when the referenced ID was last updated.
    - `id` integer — The identifier for the collection. This is how you'll reference the collection from the API.
    - `name` string — The name of the collection. This is how you'll reference the collection in liquid, e.g. `{{collection_name.data_property}}`.
    - `rows` integer — Represents the number of objects in the `data` array or CSV rows in your collection schema.
    - `schema` string[] — Lists the top-level keys that you can reference within this collection. Customer.io does not enforce any of these keys as required from your `data`.

## Other responses

- `404` — The collection `id` does not exist.
- `429` — Your request is over the 10-per-second limit. `Retry-After` tells you how many seconds you must wait before you send the next request.

## Changes

- **2026-09-02** `5da2740beeb5` — 1 info
  - added the media type `application/json` for the response with the status `429`

[Change history](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/changes/v1/collections/:collection_id/get.md)

---

[API](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference.md) · [All operations](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/customer/customer-io-journeys-api-reference/revisions/5da2740beeb5/schema)