jsonpost
Converters

JSON to Query String / URL Params

Convert a JSON object into a URL-encoded query string, and back again.

Runs entirely in your browser — your data never leaves your device.

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How to use this tool

  1. 1Paste a flat JSON object into the editor.
  2. 2Choose JSON-to-query or query-to-JSON mode.
  3. 3Copy the converted result.

Frequently asked questions

How are arrays and nested objects handled?
Arrays are serialized with repeated keys or bracket notation, and nested objects are flattened using bracket paths.
Can it parse an existing query string?
Yes. Switch to query-to-JSON mode and paste a string like a=1&b=2 to get a JSON object back.
Is my data uploaded to a server?
No. Every tool on JSONPost runs entirely in your browser using JavaScript. Your JSON never leaves your device, so it is safe to use with private or sensitive data.

Related tools

JSON URL Encoder / Decoder

Encode JSON for safe use in URLs or decode URL-encoded JSON back into readable form.

JSON to Base64 Encoder

Encode JSON into a Base64 string for safe transmission in URLs, headers, and data URIs.

JSON Flattener & Unflattener

Flatten nested JSON into dot/bracket key-value pairs, or reverse the process.