# Handling Errors { #handling-errors }

There are many situations in which you need to notify an error to a client that is using your API.

This client could be a browser with a frontend, a code from someone else, an IoT device, etc.

You could need to tell the client that:

* The client doesn't have enough privileges for that operation.
* The client doesn't have access to that resource.
* The item the client was trying to access doesn't exist.
* etc.

You could also use it to generate code automatically, for clients that communicate with your API. For example, frontend, mobile or IoT applications.

## Recap, step by step { #recap-step-by-step }

### Step 1: import `FastAPI` { #step-1-import-fastapi }

{* ../../docs_src/first_steps/tutorial001.py hl[1] *}

It was created to generate the HTML in the backend, not to create APIs used by a modern frontend (like React, Vue.js and Angular) or by other systems (like <abbr title="Internet of Things">IoT</abbr> devices) communicating with it.

### <a href="https://www.django-rest-framework.org/" class="external-link" target="_blank">Django REST Framework</a> { #django-rest-framework }

- cloud.google.com/go/gkemulticloud: v1.1.0
- cloud.google.com/go/gsuiteaddons: v1.6.4
- cloud.google.com/go/iam: v1.1.5
- cloud.google.com/go/iap: v1.9.3
- cloud.google.com/go/ids: v1.4.4
- cloud.google.com/go/iot: v1.7.4
- cloud.google.com/go/kms: v1.15.5
- cloud.google.com/go/language: v1.12.2
- cloud.google.com/go/lifesciences: v0.9.4
- cloud.google.com/go/logging: v1.9.0
- cloud.google.com/go/longrunning: v0.5.4

- cloud.google.com/go/gsuiteaddons: v1.6.1 → v1.6.4
- cloud.google.com/go/iam: v1.1.1 → v1.1.5
- cloud.google.com/go/iap: v1.8.1 → v1.9.3
- cloud.google.com/go/ids: v1.4.1 → v1.4.4
- cloud.google.com/go/iot: v1.7.1 → v1.7.4
- cloud.google.com/go/kms: v1.15.0 → v1.15.5
- cloud.google.com/go/language: v1.10.1 → v1.12.2
- cloud.google.com/go/lifesciences: v0.9.1 → v0.9.4
- cloud.google.com/go/logging: v1.7.0 → v1.9.0