JSON Size Analyzer Online

Measure UTF-8 byte sizes and count JSON types and structural nodes. Free json size analyzer online, with no installation or account.

Tool capabilities

Input: TXT
Output: TXT · JSON

How to use JSON Size Analyzer

Measure UTF-8 byte sizes and count JSON types and structural nodes. This json size analyzer works directly in your browser and is free to use without an account.

Paste or open your input in the editor.
Run the tool and inspect the output. If the input is invalid, correct the reported error and run it again.
Copy the result or download it to your device.

JSON Size Analyzer · Example

Input

{"name":"LocalKit","active":true,"items":[{"id":2,"name":"beta"},{"id":1,"name":"alpha"}]}

Output

{
  "inputBytes": 90,
  "compactBytes": 90,
  "nodes": 10,
  "topLevel": {
    "name": 10,
    "active": 4,
    "items": 48
  }
}

Measure UTF-8 byte sizes and count JSON types and structural nodes.

Usage notes

Inputs and results are processed on this device. Tool content is not sent to a processing server.

JSON Size Analyzer