Array styles
tags[]=a&tags[]=b, tags=a&tags=b, tags[0]=a or tags=a,b to match your backend.
JSON to Query String Converter
Build URL parameters from a JSON object, encoded and ready to append to a URL.
Input
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Result
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Original (left)
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Modified (right)
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Differences
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About this tool
How the JSON to Query String works
Convert JSON to a URL query string with encoding. Choose how arrays are written (tags[]=, repeated keys, indexes or commas); nested objects use brackets.
How to use the JSON to Query String
- Paste a JSON object.
- Pick the array style and encoding.
- Copy the query string and append it to your URL.
JSON to Query String example
{"q":"running shoes","page":2,"size":[9,10],"filter":{"color":"blue"}}q=running%20shoes&page=2&size[]=9&size[]=10&filter[color]=blueWhen to use it
- Building API request URLs for testing.
- Creating links with filters and UTM parameters.
- Generating fixtures for URL parsing tests.
Tip: Encoding makes spaces %20; some servers expect + instead, which is equivalent in query strings.
Nested objects
filter: {color: "blue"} becomes filter[color]=blue.
Encoding
Values are percent-encoded so spaces, & and = are safe; turn it off for readable output.
Null values
null becomes an empty value (key=).
FAQ
Common questions
Which array style should I use?
PHP and Rails expect tags[]=; Express with qs reads all styles; many REST APIs use repeated keys or commas. Check your API documentation.
Are brackets encoded?
Brackets are left readable (filter[color]); they are accepted by browsers and servers.
Does it add the leading ?
No, so you can append it with ? or &.
Is it private?
Yes, the query string is built in your browser.
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