jfmt.dev

JSON Minify

Compress JSON by removing whitespace and line breaks. The output is still valid JSON — just smaller for APIs, logs, and storage.

input.json

JSON formatter

Input0 B
Output · preview.json
{ }
Run a tool to see a polished result here
Live syncReady · processed locally in your browser
Local-only processing: your JSON never leaves this browser tab.
When to minify JSON
Use minify before shipping config, logging request bodies, or packing JSON into query strings. Pretty-print on the homepage if you need to read it again. Everything runs locally.
Sample input on this page
The editor is prefilled with a small example for JSON Minify. Minify removes insignificant whitespace so the JSON stays valid but smaller for APIs, logs, and query strings. Replace it with your own file; the sample and your payload stay in this tab.
{
  "service": "jfmt",
  "enabled": true,
  "retries": 3
}
How to use this tool
  1. Paste JSON into the JSON Minify editor. The file stays in this browser tab and is not uploaded to jfmt.dev.
  2. Click Run. Minify removes insignificant whitespace so the JSON stays valid but smaller for APIs, logs, and query strings.
  3. Copy the output, or continue with a related tool below. Related tools on this site include beautify, validate, minify, JSON to CSV, JSON to YAML and JSON to XML — all local.
  4. JFmt runs in a Web Worker in this tab. Do not paste production secrets if you share your screen.
When this page is the right choice
This dedicated JSON Minify URL matches that search intent; the homepage stays the general formatter. Minify removes insignificant whitespace so the JSON stays valid but smaller for APIs, logs, and query strings. Related tools on this site include beautify, validate, minify, JSON to CSV, JSON to YAML and JSON to XML — all local. JFmt runs in a Web Worker in this tab. Do not paste production secrets if you share your screen. Read errors in the output pane instead of sending production payloads to another service.
Related tools
JSON formatterRepair JSONJSON → YAMLFormatter
FAQ
Does minifying change values?
No. Minify only removes insignificant whitespace. Keys, strings, and numbers stay the same.
Is minified JSON still valid?
Yes. Parsers treat compact and pretty JSON the same. Only humans notice the missing spaces.
Can I pretty-print after minifying?
Yes. Open the homepage formatter or switch the sidebar to Format JSON.
Does this tool upload my file?
No. Parsing and conversion run in a Web Worker in this tab. jfmt.dev does not receive the payload.
Why is there a separate URL from the homepage?
So people searching for this operation land on a page that already selects it. Minify removes insignificant whitespace so the JSON stays valid but smaller for APIs, logs, and query strings.