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JSON Minifier

Minify JSON by removing whitespace, line breaks, and indentation. Free online JSON minifier with size comparison and savings display.

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What is JSON Minifier?

JSON minification removes all unnecessary whitespace (spaces, tabs, newlines) from JSON data without changing its content. This reduces file size, which speeds up API responses, decreases bandwidth usage, and improves load times. Minified JSON is harder to read but functionally identical to formatted JSON.

How to Use

  1. Paste your formatted JSON in the input area
  2. The minified JSON appears instantly in the output panel
  3. See the original size, minified size, and savings percentage above the output
  4. Use Swap to put the minified result back into the input for further editing

Examples

Minify a JSON object

Input{ "name": "Alice", "age": 30, "city": "Beijing" }
Output{"name":"Alice","age":30,"city":"Beijing"}

Minify nested JSON

Input{ "users": [ {"id": 1, "name": "Alice"}, {"id": 2, "name": "Bob"} ] }
Output{"users":[{"id":1,"name":"Alice"},{"id":2,"name":"Bob"}]}

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Frequently Asked Questions

How much size does minification save?

It depends on the formatting. Heavily formatted JSON with 4-space indentation can shrink by 40-60%. Minimally formatted JSON may only save 10-20%. The savings percentage is displayed above the output.

Is minified JSON still valid?

Yes. Minification only removes whitespace, which is optional in JSON. The data, structure, and values remain identical. Any JSON parser can read minified JSON without issues.

Should I minify JSON in production?

Yes. Minified JSON reduces network transfer time and bandwidth costs. For development, use formatted JSON for readability. In production APIs, serve minified JSON and let client-side tools handle formatting when needed.