Developer Tools

JSON Minifier

Paste formatted or pretty-printed JSON and remove all whitespace, newlines, and indentation. Get compact single-line JSON ready for HTTP payloads, environment variables, or minified config files.

Removes all whitespace Browser-only One-click copy
json JSON (formatted)
Runs in your browser; code never leaves your device
Input Text Output JSON Browser-only No upload by default

Features

  • Removes all whitespace and newlines from valid JSON
  • Validates JSON syntax before minifying
  • Shows original and minified byte counts with savings
  • Copy minified JSON with one click
  • Download as .json file
  • Browser-only. No upload

How to use it

  1. Paste your formatted JSON into the input panel.
  2. Minified JSON appears instantly in the output.
  3. Check the size reduction shown below.
  4. Copy or download the compact result.

Use cases

  • Minifying JSON for API request payloads
  • Compacting JSON for localStorage or cookie storage
  • Reducing JSON config file sizes
  • Preparing compact JSON for environment variables

Limitations

  • The tool parses JSON before minifying so malformed input is rejected.
  • Very large input can be slower on older devices.
  • This utility is designed for common snippets and local inspection, not as a full security or language-specific validator.
See also

Related tools

Dev Browser

JSON Formatter

Format and beautify JSON online. Paste minified or messy JSON and get clean, 2-space indented output with syntax validation, instant, in-browser, no upload.

Use tool
Dev Browser

JSON Validator

Validate JSON syntax online with exact error messages. Get line number, column, and a human-readable explanation for every JSON error, processed in your browser.

Use tool
data Browser

JSON Flattener

Flatten nested JSON objects to dot-path keys in your browser. Converts {a:{b:1}} to {'a.b':1}. Copy or download the result.

Use tool
Dev Browser

JWT Decoder

Decode and inspect JSON Web Tokens in your browser. See the header, payload, and signature in readable JSON. No server, no logging, completely private.

Use tool
Dev Browser

Base64 Encode Decode

Encode text to Base64 or decode Base64 to plain text instantly in your browser. Supports standard and URL-safe Base64, Unicode, and binary-safe encoding.

Use tool
Dev Browser

URL Parser

Parse any URL into its components: protocol, host, port, path, query parameters, and hash fragment, instantly in your browser.

Use tool
Questions & answers

Frequently asked

Does it check if JSON is valid?

Yes. Invalid JSON produces a parse error message. The minifier only processes syntactically valid JSON.

Does JSON Minifier upload my input?

Your file or text is processed in your browser and is not uploaded.

What does JSON Minifier output?

It outputs compact JSON. The tool parses JSON before minifying so malformed input is rejected.

Should I review JSON Minifier output before using it?

Yes. Developer formats and snippets can be context-sensitive, so review generated output before using it in production.