Flask

init_app() adds request context, error handling, and configures stdlib logging. LoglyHandler routes Flask logs through Logly.

Installation

This integration requires the flask package.

uv

uv add logly[flask]

pip

pip install "logly[flask]"

uv (without extras)

uv add flask

pip (without extras)

pip install flask

Missing Dependency

If flask is not installed, you'll see:

ModuleNotFoundError: No module named 'flask'

Usage

from flask import Flask
from logly.integrations.flask import init_app

app = Flask(__name__)
init_app(app)

Handler Only

from flask import Flask
from logly.integrations.flask import LoglyHandler

app = Flask(__name__)
app.logger.handlers = [LoglyHandler()]

Full Example

from flask import Flask, jsonify
from logly.integrations.flask import init_app
from logly import logger

app = Flask(__name__)
init_app(app)

@app.route("/")
def index():
    logger.info("Index page accessed")
    return jsonify({"message": "Hello World"})

@app.route("/items/<int:item_id>")
def get_item(item_id):
    logger.debug("Fetching item {}", item_id)
    return jsonify({"item_id": item_id})

if __name__ == "__main__":
    app.run(debug=True)