---
title: CompletionError - Storefront API
description: An error that occurred during a cart completion attempt.
api_version: 2026-04
source_url:
  html: https://shopify.dev/docs/api/storefront/latest/objects/CompletionError
  md: https://shopify.dev/docs/api/storefront/latest/objects/CompletionError.md
---

# Completion​Error

object

An error that occurred during a cart completion attempt.

## Fields

* code

  [Completion​Error​Code!](https://shopify.dev/docs/api/storefront/latest/enums/CompletionErrorCode)

  non-null

  The error code.

* message

  [String](https://shopify.dev/docs/api/storefront/latest/scalars/String)

  The error message.

***

## Map

### Fields with this object

* [CartCompletionFailed.errors](https://shopify.dev/docs/api/storefront/latest/objects/CartCompletionFailed#field-CartCompletionFailed.fields.errors)