json minifier

runs in your browser, nothing is uploaded

IDLE

stdin

stdout

Made by Maiyarasu S

Remove every unneeded space and line break from JSON to make it as small as it can be. The minifier runs in your browser and shows how many bytes you saved.

What changes and what does not

The whitespace between values is removed; spaces inside strings are part of the data and stay. Key order and number spelling stay exactly as written, so 41.50 stays 41.50 and an ID such as 9007199254740993 keeps every digit. The data is identical, but escape sequences in strings are written in their plain form: \u00e9 becomes é and \/ becomes /. Turn on sort keys if you also want a stable order, for example before comparing two files.

JSON Lines input stays one document per line, which is what tools that read .jsonl files expect, and saving gives you a .jsonl file.

Using the result

The status line shows the size before and after, and the change in percent. Copy the result, save it as a .min.json file, or press format to replace the input with the minified version; undo puts the original back.

Input that is not valid JSON is not minified. The error view shows what is wrong and offers repairs you can apply first.

Questions

Is minified JSON still valid JSON?

Yes. Whitespace between values has no meaning in JSON, so the data is identical.

Does it compress the file?

No. It only makes the text shorter. Web servers usually compress JSON with gzip or brotli on top of that.

Can I make it readable again?

Yes. Switch to pretty to see it formatted with 2 spaces, 4 spaces or tabs.

Is my JSON uploaded?

No. Minifying happens in this page.

Related tools

help

QUERY (the prompt line)

Type a path or a filter after guest@json:~$. JSONPath and a jq-style subset both work, and the output shows only the result. Convert, copy and save then apply to that result.

$.users[0].nameone value by path. .users[0].name is the same thing
$["odd key"] $.ports[-1] $.ports[1:3]quoted keys, counting from the end, slices
$.users[*].name or .users[].nameevery item
$..namethat key at any depth
$.users[?(@.id > 1001 && @.sudo)]filter. Operators: == != < <= > >= && || !
.users[] | select(.sudo) | .namethe same idea in jq style, with pipes
.users | map(.name) | sortbuild a new list
[.users[] | select(.sudo)] | lengthcollect matches into an array, then count

Functions: length, keys, keys_unsorted, values, type, first, last, sort, sort_by(f), unique, reverse, flatten, add, min, max, to_entries, not, select(f), map(f), has(k), test(regex), contains(x), startswith(s), endswith(s).

TABS A AND B

stdin has two tabs. diff compares a with b by structure: key order is ignored, and an item inserted into an array counts once. validate checks tab a against the JSON Schema in tab b. Click any row in either list to open that spot in the tree.

REPAIR

When input is not valid JSON, the error view lists what auto-fix would change, line by line, before you apply it: comments, trailing or missing commas, single or smart quotes, bare keys, NaN and Infinity, hex and other number spellings, markdown code fences, JSONP wrappers, and input that was cut off. undo brings your original back.

VALUE HINTS

Links are clickable. Numbers that look like Unix times show the date. A badge after a string means it holds something: {…} JSON, jwt a token (decoded, never verified), b64 base64 text. Click the badge, or press Enter on the row, to expand it in place. A token pasted on its own, with or without Bearer in front, is offered as decode jwt instead of a parse error. Decoding never checks the signature.

KEYS

Ctrl+F or /search the output: the tree, or the text of minify, yaml, csv and ts. Enter next match, Shift+Enter previous. Write /pattern/ for a regular expression. In text output the keys and values buttons are off, and diff and validate switch to the tree
Alt+Qgo to the query prompt. Esc clears it
↑ ↓ ← →move in the tree. Left and right fold and unfold, with Shift they do the whole branch
Enter / Ctrl+C in the treefold or expand the row / copy the selected value
Ctrl+Enterformat stdin in place
Ctrl+Ssave the output as a file
Alt+C Alt+M Alt+S Alt+Fcopy, pretty or minify, sort keys, fold
Alt+1 Alt+2 Alt+Ttab a, tab b, next theme
Tab / Shift+Tab in stdinindent and outdent. Press Esc first to tab out of the box instead
Ctrl+Z / Ctrl+Shift+Z in stdinalso undo and redo format, auto-fix, load and clear

On a Mac, use Cmd for Ctrl and Option for Alt.

SAVED INPUT AND DISPLAY

Both tabs are kept in this browser between visits, however large. If the browser cannot keep an input, a note says so. The crt button turns scanlines and glow off. The page also drops them, and brightens dim text and borders, when your system asks for more contrast.

PRIVACY

Everything runs in this page, and the fonts are served with it. Nothing you paste is sent anywhere. A share link holds the compressed input inside the link itself, so anyone you send the link to can read it.

What you paste is also saved in this browser, so it is still here on your next visit. On a shared computer, or after pasting a secret, clear it. This removes both tabs and your settings from this browser.