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JSON Cleaner

Paste JSON and remove null values, empty strings, empty arrays, and empty objects in one click. Choose exactly which types to strip, with a count of everything removed.

Last updated: May 21, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is JSON Cleaner?

APIs, databases, and code generators often produce JSON with many null and empty values — placeholder keys with no useful data. These empty entries add noise, increase payload size, and make the JSON harder to read and process. Before storing, logging, or sending JSON, stripping the clutter is a common clean-up step.

This tool recursively traverses a JSON structure and removes the value types you select: null, empty strings (""), empty arrays ([]), and empty objects ({}). After cleaning, it shows how many entries were removed so you know exactly what changed.

How to Use JSON Cleaner

1

Paste JSON into the input area or click "Load Sample"

2

Toggle which value types to remove: nulls, empty strings, empty arrays, empty objects

3

The output updates instantly with cleaned JSON

4

Check the stat bar to see how many values were removed

5

Copy or download the result

Common Use Cases

  • API developers stripping null fields from JSON responses before sending to clients.
  • Front-end engineers cleaning up form data JSON before submitting — removing unanswered optional fields.
  • Data engineers removing empty fields from JSON records before loading into a database.
  • Developers reducing JSON log file sizes by stripping null and empty diagnostic fields.
  • Teams normalising JSON config files by removing unused empty-array and empty-object placeholders.
  • Mobile developers minimising JSON payloads by removing null values before network transmission.

Example Input and Output

A JSON object with null values, empty strings, and empty arrays is cleaned to keep only meaningful data.

JSON with empty values
{
  "id": 1,
  "name": "Alice",
  "nickname": "",
  "role": null,
  "tags": [],
  "address": {
    "city": "London",
    "zip": null,
    "notes": ""
  },
  "meta": {}
}
Cleaned JSON
{
  "id": 1,
  "name": "Alice",
  "address": {
    "city": "London"
  }
}

Privacy

All cleaning runs in your browser. No data is uploaded to any server.

false and 0 are kept

Boolean false and numeric 0 are meaningful values — they are never removed, even when removing nulls or empty strings. Only true nulls ("key": null) and true empty strings ("key": "") are affected.

Frequently Asked Questions

Does cleaning modify values inside nested objects and arrays?

Yes. The cleaner recursively traverses the entire JSON structure — all nesting levels are cleaned, not just the top level.

What happens if removing empty objects creates new empty objects?

The cleaner processes the tree bottom-up. When a nested object's children are all removed, the parent object itself becomes empty and is also removed in the same pass.

Can I remove only some types, like nulls but not empty strings?

Yes. Each type has its own toggle — null, empty string, empty array, empty object, and undefined are all independent. Enable only the types you want to remove.

Will this change my JSON data?

Only by removing the entries you choose. All non-empty, non-null values are preserved exactly as they were.

Is my JSON sent to a server?

No. All cleaning runs in your browser. Your JSON never leaves your device.

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