Are keys and values automatically URL-encoded?

Yes. Encoding uses the browser's built-in URLSearchParams API. Spaces become %20, ampersands become %26, equals signs become %3D, and full Unicode (including emoji) is escaped to its UTF-8 percent form. The output is safe to append to any URL without further escaping.

Does it handle repeated keys for array-style parameters?

Yes. Add the same key on multiple rows — the builder includes each row's value as a separate parameter in the output (e.g., tag=alpha&tag=beta). This matches what Express's qs parser, Rails strong parameters, and most modern backends consume by default.

Can I parse an existing query string back into rows?

Not in this tool — it's a builder, not a parser. To break a query string apart, use our URL Parser, which decomposes the full URL (protocol, host, path, query, hash) and lists every parameter with auto-labeled UTM and tracking tags. Build here, parse there.

What's the difference between this and the UTM Builder?

This tool is a generic any-parameter builder — keys and values are freeform. The UTM Builder is purpose-built for Google Analytics campaign URLs with named fields (Source, Medium, Campaign, Content, Term) and validation specific to UTM conventions. Use UTM Builder if you only need campaign URLs; use this when you need arbitrary query parameters for APIs, filters, or deep links.

Does the tool support empty values or empty keys?

Empty values output key= (a key followed by an equals sign and nothing). Empty keys are skipped — a row with no key contributes nothing to the output. To remove a parameter, delete the row instead of clearing one of its fields.

Is my data sent to a server?

No. Everything runs locally in your browser. The URLSearchParams API is built into every modern browser, and the tool never makes a network request with the keys, values, or generated query string. Safe for URLs containing tokens, session IDs, or proprietary parameters.

Will the output work with my framework's query parser?

For repeated keys (arrays), yes — Express qs, Rails strong parameters, Spring @RequestParam List, ASP.NET model binding, and Go's url.Values all accept the standard ?key=a&key=b format. PHP defaults are an exception: you may need ?key[]=a&key[]=b — type the brackets explicitly in your key field if so.

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查詢字串建構器

建立和解析 URL 查詢參數。

資料留在您的裝置無需上傳至伺服器可離線使用

查詢參數

鍵值

已填寫參數

預覽

?tool=json-formatter&lang=zh-TW

編碼後的查詢字串

為什麼用這個工具

從鍵值對建立查詢字串，或將查詢字串解析回鍵值對。

簡化 URL 參數編輯作業。

同時支援組合與解析兩個方向。

怎麼使用

01新增鍵值對或貼上查詢文字。

02複製產生的查詢字串。

複製前快速檢查

先確認輸入格式符合您的預期。

在把結果用於文件、連結、設定或訊息前快速掃一眼。

只複製您真正需要的輸出。

常見問題

值會進行 URL 編碼嗎？

會。鍵和值均安全編碼。

可以解析現有的查詢字串嗎？

可以。貼上查詢字串後，工具會將其分割為可編輯的鍵值對列。

支援重複的鍵嗎？

支援。相同的鍵可出現在多個列中，每個實例都會包含在輸出中。

查詢字串建構器

為什麼用這個工具

怎麼使用

複製前快速檢查

常見問題

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