Syntax Checker & Code Validator
About Object → Query String
The JavaScript Object to URL Query String Serializer converts JSON objects and nested parameter dictionaries into RFC 3986 percent-encoded query strings (`?key=value&arr[]=1`) for API requests, webhooks, and routing.
How to Use Object → Query String
Step 1
Paste your JSON object into the input pane.
Step 2
Select your preferred array serialization format.
Step 3
Review the generated query string.
Step 4
Click "Copy Query String".
Practical Use Cases for Object → Query String
Constructing REST API `GET` Request URLs
Serialize frontend filter state objects into URL query parameters to pass into `fetch()` or `axios.get()` requests.
Building Dynamic Shareable Web Links
Convert application state dictionaries into shareable URL parameters for deep-linking features.
Input & Output Examples
Serializing Object to Query String
`{ "category": "books", "limit": 25, "tags": ["fiction", "bestseller"] }``?category=books&limit=25&tags[]=fiction&tags[]=bestseller`
Key Features & Performance
- ✓Array serialization modes: Bracket (`arr[]`), Index (`arr[0]`), Comma-separated (`arr=1,2`), or Repeat (`arr=1&arr=2`).
- ✓Automatic RFC 3986 percent-encoding for spaces, special characters, and Unicode.
- ✓Option to prefix leading question mark (`?`).
- ✓100% Client-Side memory execution.
- ✓1-Click Copy query string.
Key Terminology & Definitions
URL Serialization
Converting in-memory data structures (objects, arrays) into a flat, URL-safe string representation.
Percent-Encoding
Replacing non-ASCII and reserved URI characters with `%` followed by their hexadecimal ASCII code.
