Does it change my data?

No — only whitespace. It parses and re-serialises, so the result is the same document in the smallest valid form.

What if the JSON is invalid?

It errors. Minifying invalid JSON isn't meaningful; validate it first.

cleaners · free tool

Strip whitespace from JSON down to the smallest valid form.

Runs in your browser — your data never leaves it

Input

Paste, type, or drop a file. Runs as you type.

Output

Output appears here as you type.

Input

{
  "a": 1,
  "b": [2, 3]
}

Output

{"a":1,"b":[2,3]}

This example is one of JSON Minifier's test cases — if the tool stopped producing this output, the build would fail.

Does it change my data?: No — only whitespace. It parses and re-serialises, so the result is the same document in the smallest valid form.
What if the JSON is invalid?: It errors. Minifying invalid JSON isn't meaningful; validate it first.

Pretty-print and indent JSON — in your browser, nothing uploaded.

Check whether JSON is valid and see the first error.

Turn a JSON array of records into CSV, with proper escaping.

Convert JSON into XML, with sensible element names and nesting.