tofo-boxtools

JSON Size Calculator

developer

Calculate the byte size of a JSON payload. Shows minified size, formatted size, and key/value counts.

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JSON
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What is JSON Size Calculator?

JSON Size Calculator is a free online developer utility. Calculate the byte size of a JSON payload. Shows minified size, formatted size, and key/value counts. It runs entirely in your browser, making it fast and accessible without any setup or installation.

How to Use JSON Size Calculator

  1. 1

    Paste your JSON data into the input field. The tool accepts both formatted and minified JSON.

  2. 2

    Click the Run button to process your input.

  3. 3

    Copy the result from the output panel using the Copy button, or download it as a text file.

Common Use Cases

  • →Speeding up repetitive development tasks.
  • →Validating and transforming data during debugging.
  • →Generating test data for development and QA environments.

Frequently Asked Questions

Is JSON Size Calculator free to use?

Yes, JSON Size Calculator is completely free with no usage limits. No account, signup, or payment is required.

Is my data sent to a server?

No. JSON Size Calculator runs entirely in your browser. Your data never leaves your device and is never sent to any server.

How accurate are the calculations?

All calculations use standard mathematical formulas and are accurate for practical use. Results are rounded to a reasonable number of decimal places for readability.

Does this tool work on mobile devices?

Yes, JSON Size Calculator is fully responsive and works on smartphones and tablets. It runs in any modern browser including Chrome, Firefox, Safari, and Edge.

🖼️
Image Tool

Try Image Compressor

Reduce image size up to 80% — free, instant, no upload needed.

→
🖼️
Image Tool

Try Image Compressor

Reduce image size up to 80% — free, instant, no upload needed.

→