IT Consulting
Illustration of key-value pair rows combining into a percent-encoded query string

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.

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"}]}.