Query Strings via request.args
Read URL parameters after the question mark.
Query Strings via request.args is a free Flask Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Flask Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
What Is a Query String
A query string is the part of a URL after the question mark, like ?q=cats&page=2. It carries small bits of optional input. 🔎
Where request Comes From
Flask gives you a global request object that holds everything about the incoming call. Import it once and reach for it inside any view.
from flask import requestMeet request.args
The request.args attribute is a dict-like object holding every key and value parsed from the query string for you.
Read a Value by Key
Treat request.args like a dictionary: index it by the parameter name to pull the matching value straight out of the URL.
term = request.args["q"]Prefer .get to Avoid Crashes
Indexing a missing key raises an error. Use .get instead so an absent parameter returns None rather than a 400.
term = request.args.get("q")Supply a Default Value
Pass a second argument to .get and that value is used when the key is missing, keeping your view safe and predictable.
page = request.args.get("page", "1")Everything Arrives as a String
Query values are always text, even numbers. If you need an int, convert it yourself after reading the raw string.
page = int(request.args.get("page", 1))Coerce With the type Argument
The type keyword on .get converts the value for you and falls back to the default if conversion fails.
page = request.args.get("page", 1, type=int)Repeated Keys With getlist
When one key appears several times, like ?tag=a&tag=b, use getlist to receive every value as a Python list.
tags = request.args.getlist("tag")Loop Over All Parameters
Because request.args behaves like a dict, you can iterate its items to inspect or log every parameter a client sent.
for k, v in request.args.items():
print(k, v)A Realistic Search View
Combine these pieces and your search endpoint reads a term and a page cleanly, with sensible defaults baked in.
@app.route("/search")
def search():
q = request.args.get("q", "")
return f"Searching {q}"Quick Check
Time to lock in how query strings work.
Recap: Query Strings
You read URL parameters through request.args, used .get with defaults, coerced types, and grabbed repeated keys with getlist. Nicely done! 🎉
Frequently asked questions
Is the “Query Strings via request.args” lesson free?
Yes — the full text of “Query Strings via request.args” is free to read here on the web, and the Flask Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Flask Academy course, upgrade to CoddyKit PRO.
What will I learn in “Query Strings via request.args”?
Read URL parameters after the question mark. You practise Flask Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Flask Academy?
No prior experience is required. Flask Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Query Strings via request.args” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Flask Academy lesson?
Yes. Every Flask Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Query Strings via request.args
- Form Fields via request.form
- JSON Bodies via request.get_json
- Headers, Cookies, and the Client IP