JSON Minifier

Pretty-printed JSON is great for humans but wastes bytes on spaces, tabs and newlines. A JSON minifier strips all of that away, which matters when every byte counts: API responses, configuration shipped to browsers, cached payloads, or log lines where one record must stay on one line.

{
  "name": "John",
  "age": 30,
  "roles": [
    "admin",
    "dev"
  ]
}

{"name":"John","age":30,"roles":["admin","dev"]}

Minification deletes only layout whitespace: the spaces, tabs and newlines used for indentation. Keys, values, structure and even the whitespace inside string values are all preserved byte-for-byte, so the minified output is the exact same JSON on one line. This also means minifying is lossless — format the result again and you get your pretty JSON back.

• Removed: indentation and line breaks between tokens, as in the example above.
• Kept: everything inside quoted strings, including spaces like "first name".
• Formatter vs minifier — the two are exact opposites: a formatter adds indentation for readability, a minifier strips it for size. Both produce identical data; the JSON Formatter un-minifies, the JSON Minifier re-compacts.

• Paste your formatted or indented JSON into the editor above.
• The minified single-line result appears instantly.
• Copy it or download it as a .json file.
• Need it readable again? Switch the toolbar to JSON Format.

• ◆Validate before you minify: run JSON Validate first so syntax errors are caught while the document is still readable.
• ◆Keep Split view open to compare your indented source against the compact result side by side.
• ◆Share links encode the workspace state — handy for handing a minified payload to a teammate without attaching files.
• ◆Word wrap off makes single-line output easier to measure and diff.

Minification

Reducing text size by deleting characters that machines ignore — whitespace, indentation and newlines. Unlike compression (gzip, brotli), the output remains plain readable ASCII and needs no decompression step.