JSON Cleaner

What is JSON Cleaner

Last reviewed: April 18, 2026

JSON (JavaScript Object Notation) is a lightweight, human-readable data format used almost everywhere on the web for APIs, config files, and log output.

JSON Cleaner parses your JSON, recursively walks through every object and array, removes null / undefined / empty-string leaves, and re-serialises with a clean two-space indent.

It's a pragmatic helper for trimming API responses, shrinking fixture payloads, and producing compact settings files where empty or default values can be implied.

Why use it

• Shrink API responses for fixtures or screenshots.
• Clean up config files before committing them.
• Remove noise from logging payloads.
• Produce compact JSON for messaging systems with size limits.
• Pre-process payloads for search indexers that penalise empty fields.

Features

• Removes null, undefined, and empty-string leaves
• Strips // and /* */ comments
• Preserves empty arrays and zero values
• Re-serialises with two-space indent
• All JSON Cleaner work stays on your device

How to use JSON Cleaner

1. Paste JSON. Drop any JSON or JSONC document.
2. Click Clean. Null values, empty strings, and comments are stripped.
3. Copy result. Use the compact JSON in your service or fixture.

Example (before/after)

{
  "id": 7,
  "name": "Ada",
  "middleName": null,
  "tags": [],
  "notes": ""
}

{
  "id": 7,
  "name": "Ada"
}

Common errors

FAQ

Related tools

Pair JSON Cleaner with the fixer, sorter, and one-line tool for a full tidy-up pipeline. You can also browse the full Formatters & Beautifiers category for more options.