URL-decode JSON
Convert URL-escaped JSON back to regular JSON. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use URL-decode JSON
- 1. Paste the percent-encoded string. Paste the URL-encoded text you copied from a query string or address bar, the kind full of %7B, %22 and similar percent-sign sequences in place of normal characters.
- 2. Get the decoded JSON. Every percent-encoded sequence is converted back to its original character, following the same rules as decodeURIComponent, revealing the JSON text that was embedded in the URL.
- 3. Copy the readable JSON. Copy the decoded JSON and read it directly, or paste it into a formatter to prettify it further, now that the percent-encoding has been stripped away.
When to use URL-decode JSON
URL-decode JSON reverses percent-encoding to reveal the JSON document that was embedded in a URL's query string. It is for reading data a link is carrying, whether that link came from a browser's address bar, a shared bookmark, or a redirect URL.
- Reading state from a shared link. Someone sent you a URL with a long, encoded query parameter and you want to see what filter or view state it actually represents before opening it.
- Inspecting an OAuth redirect URL. You copied a redirect URL from a network log during an OAuth flow and want to decode the JSON parameter it carries to debug the authorization state.
- Debugging a broken query string. An application is misbehaving with a certain URL, and decoding the percent-encoded JSON parameter helps you confirm whether the data itself is malformed or something else is wrong.
- Reviewing analytics or tracking parameters. A marketing or analytics link includes an encoded JSON payload in its query string, and you want to see exactly what data it is passing along.
Examples
Decode a percent-encoded object
Input
%7B%22q%22%3A%20%22a%20b%22%7D
Output
{"q": "a b"}About the URL-decode JSON tool
URL-decode JSON runs as plain JavaScript in your browser tab, with no server behind it. Convert URL-escaped JSON back to regular JSON. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's JSON Tools section, 90 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
There is nothing to configure. Provide the input and the result appears on its own. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does URL-decode JSON cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.