Filter JSON
Keep only keys and values that match a pattern. 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 Filter JSON
- 1. Paste your JSON. Put the JSON document you want to filter into the input pane. It gets scanned recursively so nested keys and values are considered at every level.
- 2. Enter a Pattern and choose what it matches. Type the text or pattern to look for in the Pattern field, then choose whether Match applies to Keys, Values or Both, depending on what you're trying to isolate.
- 3. Decide whether to keep or remove matches. Turn on Remove matches instead to strip anything matching the pattern out of the document, or leave it off to keep only the matching parts and drop everything else.
- 4. Copy the filtered JSON. Choose an Indent, then copy the resulting document, which now contains only what you asked to keep, or everything except what you asked to remove.
When to use Filter JSON
Filter JSON keeps or removes parts of a document that match a pattern in their key names, their values, or both. Use Filter JSON whenever you need to isolate or strip a specific piece of a larger JSON structure without hand-editing every match.
- Redacting sensitive fields before sharing. A log dump contains fields with password or token in their name, and you want to remove all of them before pasting the log into a support ticket.
- Extracting everything about one customer. A large export mentions many customers, but you only need the entries related to one name. Filter by that name matching Values to pull out just those parts.
- Stripping internal debug fields. An API response includes internal-only fields alongside the public ones, and you want to publish a clean sample without the debug data mixed in.
- Isolating variables with a shared prefix. A JSON export of environment variables has dozens of unrelated entries, and you only need the ones starting with a specific prefix like DATABASE_.
Examples
Keep everything mentioning a name
Input
{"name": "Ada", "role": "admin", "city": "London"}Output
{
"name": "Ada"
}About the Filter JSON tool
Filter JSON does its work locally, right in the browser. Keep only keys and values that match a pattern. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the JSON Tools collection on EditSafely, a set of 90 small, focused JSON utilities that share the same instant, private workspace.
You can shape the output with 4 settings, including Pattern, Match, Remove matches instead and Indent, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Filter 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.