Query String Parser
Paste a URL query string and see every parameter — ordered key/value pairs plus structured JSON with arrays, nested objects, and bracket notation. Runs entirely in your browser, no server, no sign-up.
What this tool does
Paste a URL query string — the part after the ? — and instantly see every
parameter broken out. You get two views: an ordered list of every key = value
pair (duplicates kept, in source order), and a structured JSON object that
groups repeated keys into arrays and expands bracket notation into nested
arrays and objects. Everything runs locally in your browser — nothing is sent
to a server, it works offline, and there is no sign-up.
You can paste a bare query string, one with a leading ?, or the ?... part of
a full URL — the leading ? is stripped automatically.
What it handles
| Input | Structured result |
|---|---|
a=1&b=2 | { "a": "1", "b": "2" } |
color=red&color=green&color=blue | { "color": ["red", "green", "blue"] } |
tag[]=a&tag[]=b | { "tag": ["a", "b"] } |
x[0]=a&x[2]=c | { "x": ["a", null, "c"] } |
user[name]=Ann&user[age]=30 | { "user": { "name": "Ann", "age": "30" } } |
items[][id]=1&items[][id]=2 | { "items": [ { "id": "1" }, { "id": "2" } ] } |
q=S%C3%A3o+Paulo | { "q": "São Paulo" } |
flag&k=v | { "flag": "", "k": "v" } |
- Repeated keys collapse into an array, preserving order.
- Bracket notation — empty
[]appends to an array, a number[0]is an array index (gaps becomenull), and a name[key]is an object key. They nest arbitrarily deep (a[b][c]=v), including arrays of objects. - Percent-encoding (
%20,%C3%A3, …) is decoded in both keys and values. - Both
∧separate pairs; empty segments are skipped.
The "decode + as a space" option
By default a + is decoded to a space — the
application/x-www-form-urlencoded convention used by HTML form submissions and
most query strings. Turn the option off to keep + literal, following strict
RFC 3986 percent-encoding (where a space must be written %20 and + is just a
plus sign).
FAQ
Is it free and private?
Yes — your input never leaves your device, and the page keeps working offline once loaded.
Does it parse a whole URL?
Paste only the query part (after ?). It will
strip a leading ? for you. For splitting a full URL into scheme/host/path/etc.,
use the URI parser tool.
Why does a bare key like ?flag show no value?
A key with no = has no
value — it's reported with value absent in the pairs list and as an empty
string in the structured object.
What happens to duplicate keys?
They are all kept. In the ordered pairs list each appears in order; in the structured object they collapse into an array.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool parse-query-string "name=John+Doe&color=red&color=blue&user[age]=30"New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/parse-query-string/?query=name%3DJohn%2BDoe%26color%3Dred%26color%3Dblue%26user%5Bage%5D%3D30&plus_as_space=trueMachine-readable descriptor: tool.json — title + parameters JSON Schema for agents.