Query String Builder

Add key/value rows to build a query string, or paste an existing one below to load it into rows. Runs entirely in your browser.

Query string

Paste a query string to load it into rows

ℹ️ How this works

Uses the browser's built-in URLSearchParams for encoding/decoding — spaces become +, special characters are percent-encoded, exactly as the browser would send them.
Rows with an empty key are skipped when building the query string.
Runs entirely client-side — nothing here is ever sent anywhere. The JSON API below is a separate, opt-in endpoint for scripts.

💻 Show API usage examples (cURL)

Build a query string:

curl -sS "https://devops.majbase.com/query-string-builder/api" \
    --data-urlencode 'direction=build' \
    --data-urlencode 'pairs=[{"key":"a","value":"1"},{"key":"name","value":"John Doe"}]'

Returns {"query_string": "?a=1&name=John+Doe"}.

Parse one back into pairs:

curl -sS "https://devops.majbase.com/query-string-builder/api" \
    --data-urlencode 'direction=parse' \
    --data-urlencode 'query_string=?a=1&name=John+Doe'

Returns {"pairs": [{"key":"a","value":"1"}, {"key":"name","value":"John Doe"}]}.