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Utilnivo

Developer

Utilnivo

JSON Minify Online

Minify JSON by removing whitespace for smaller payloads and wire size.

No registration
  • On your device

Browse more in Developer or all tools.

Why is my JSON invalid?

Common causes: trailing commas after the last property, single-quoted strings instead of double quotes, unescaped line breaks inside strings, and comments (JSON does not allow // or /* */). The formatter highlights the parse error line when the browser reports a position—fix that token first, then re-validate.

Private on your device

Your information stays on your device and is not uploaded.

Related tools

This JSON minify online tool strips unnecessary spaces, tabs, and line breaks from formatted JSON. Shrink config snippets, API samples, and test fixtures for production payloads or embedded scripts—all processed on your device.

Minified JSON is ideal for production APIs and embedded scripts where bytes matter. Keep pretty-printed copies for human review.

Minify only works on valid JSON—trailing commas and single quotes will cause parse errors.

How to use this tool

Paste formatted JSON, click minify, and copy the compact output. Fix any syntax errors reported before minifying.

Worked example

Example: minify a 12 KB indented config file to a single line for embedding in a CI environment variable without changing any values.

When to use this

  • Shrinking config for environment variables.
  • Preparing compact test fixtures.
  • Reducing payload size in documentation examples.

Common examples

  • Minified API response from `curl` → indented JSON for diffing against staging.
  • Invalid trailing comma in config JSON → parser error line highlighted before deploy.
  • Large nested object → collapse sections mentally after pretty-print for code review.
  • Stripe webhook payload → pretty-print to inspect nested `data.object` fields.
  • package-lock fragment → validate structure before pasting into a bug report.

Common mistakes

  • Minifying invalid JSON and assuming the tool broke your data.
  • Losing readability by minifying without keeping a formatted backup.
  • Mixing JSON with comments without enabling JSONC support.

How it works

Paste JSON to format it with readable indentation or minify it into a single line. Invalid JSON shows a parse error with line and column when available. Optional key sorting orders object keys alphabetically. Formatting works on your device.

Limitations

Invalid JSON will not format until syntax errors are fixed. Very large documents may slow the browser tab.

Privacy and file handling

Your data stays on your device and is not uploaded.

Related JSON Formatter pages

These pages use the same json formatter with examples tailored to different tasks.

FAQ

Frequently asked questions

What is the difference between minify and format?

Minify removes whitespace for smaller size; format adds indentation for readability.

Does minify alter values or keys?

No. Minification only removes whitespace—the data structure and values stay the same.

Is there a file size limit?

Very large files may slow the browser—split huge logs before minifying.

Related pages

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