FastAPI

Learn about using Sentry with FastAPI.

The FastAPI integration adds support for the FastAPI Framework.

Install sentry-sdk from PyPI with the fastapi extra:

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pip install --upgrade 'sentry-sdk[fastapi]'

If you have the fastapi package in your dependencies, the FastAPI integration will be enabled automatically when you initialize the Sentry SDK.

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import sentry_sdk

sentry_sdk.init(
    dsn="https://examplePublicKey@o0.ingest.sentry.io/0",
    # Set traces_sample_rate to 1.0 to capture 100%
    # of transactions for tracing.
    traces_sample_rate=1.0,
    # Set profiles_sample_rate to 1.0 to profile 100%
    # of sampled transactions.
    # We recommend adjusting this value in production.
    profiles_sample_rate=1.0,
)

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from fastapi import FastAPI

sentry_sdk.init(...)  # same as above

app = FastAPI()

@app.get("/sentry-debug")
async def trigger_error():
    division_by_zero = 1 / 0

When you point your browser to http://localhost:8000/sentry-debug a transaction will be created in the Performance section of sentry.io. Additionally, an error event will be sent to sentry.io and will be connected to the transaction.

It takes a couple of moments for the data to appear in sentry.io.

The following information about your FastAPI project will be available to you on Sentry.io:

  • By default, all exceptions leading to an Internal Server Error are captured and reported. The HTTP status codes to report on are configurable via the failed_request_status_codes option.
  • Request data such as URL, HTTP method, headers, form data, and JSON payloads is attached to all issues.
  • Sentry excludes raw bodies and multipart file uploads.
  • Sentry also excludes personally identifiable information (such as user ids, usernames, cookies, authorization headers, IP addresses) unless you set send_default_pii to True.

Issues List

The following parts of your FastAPI project are monitored:

  • Middleware stack
  • Middleware send and receive callbacks
  • Database queries
  • Redis commands

Performance details are shown as waterfall diagram

The parameter enable_tracing needs to be set when initializing the Sentry SDK for performance measurements to be recorded.

By adding FastApiIntegration to your sentry_sdk.init() call explicitly, you can set options for FastApiIntegration to change its behavior. Because FastAPI is based on the Starlette framework, both integrations, StarletteIntegration and FastApiIntegration, must be instantiated.

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from sentry_sdk.integrations.starlette import StarletteIntegration
from sentry_sdk.integrations.fastapi import FastApiIntegration

sentry_sdk.init(
    # same as above
    integrations=[
        StarletteIntegration(
            transaction_style="endpoint",
            failed_request_status_codes=[403, range(500, 599)],
        ),
        FastApiIntegration(
            transaction_style="endpoint",
            failed_request_status_codes=[403, range(500, 599)],
        ),
    ]
)

You can pass the following keyword arguments to StarletteIntegration() and FastApiIntegration():

  • transaction_style:

    This option lets you influence how the transactions are named in Sentry. For example:

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    import sentry_sdk
    from sentry_sdk.integrations.starlette import StarletteIntegration
    from sentry_sdk.integrations.fastapi import FastApiIntegration
    
    sentry_sdk.init(
        # ...
        integrations=[
            StarletteIntegration(
                transaction_style="endpoint"
            ),
            FastApiIntegration(
                transaction_style="endpoint"
            ),
        ],
    )
    
    app = FastAPI()
    
    @app.get("/catalog/product/{product_id}")
    async def product_detail(product_id):
        return {...}
    

    In the above code, the transaction name will be:

    • "/catalog/product/{product_id}" if you set transaction_style="url"
    • "product_detail" if you set transaction_style="endpoint"

    The default is "url".

  • failed_request_status_codes:

    A list of integers or containers (objects that allow membership checks via in) of integers that will determine which status codes should be reported to Sentry.

    Examples of valid failed_request_status_codes:

    • [500] will only send events on HTTP 500.
    • [400, range(500, 599)] will send events on HTTP 400 as well as the 500-599 range.
    • [500, 503] will send events on HTTP 500 and 503.

    The default is [range(500, 599)].

  • FastAPI: 0.79.0+
  • Python: 3.7+
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