JSON Formatter

JSON Formatter.

For JSON that looks like a crime scene.

Input
Output
No upload
Works offline
No idea what's in your data

Need to format thousands of JSON files? The offline bundle handles batches with no size limit. $99 once.

Get Bundle →
// How it works

Three steps. Zero uploads.

01
Paste
Paste your JSON or drop a .json file. It stays on your device.
02
Format
fwip validates the syntax and pretty-prints with proper indentation. Errors are highlighted with line numbers.
03
Copy
Copy the formatted JSON or download as a file. Nothing was ever uploaded.
// Why this is different

Your data never leaves your machine.

Most online JSON formatters send your data to a server for processing. Your JSON passes through systems you don't control.

fwip works differently. The formatter runs entirely in your browser. Your data is read from your device, processed on your CPU, and the result is saved back to your device. No server is involved. We literally cannot see your file.

No server processing

Everything runs on your device using WebAssembly. Your file never touches a network.

No account required

Drop a file. Get a result. No sign-up, no email, no password.

No subscription

Free in the browser. $99 once for the offline bundle. That's it. Forever.

Works offline

The desktop version works with no internet connection at all.

// How fwip compares

fwip vs the rest.

fwipJSONLintPrettierCodeBeautify
Upload requiredNoNoNoNo
Account requiredNoNoNoNo
Price$15 / toolFreeFree / $20+/yrFree
Files leave deviceNeverNoNoNo
Works offlineYesNoYes (CLI)No
Batch processingOffline bundleNoYes (CLI)No
// Questions

Frequently asked.

How do I format JSON online without uploading?▾
Paste your JSON into fwip or drop a .json file. It formats and validates entirely in your browser. Your data never leaves your device.
Does fwip validate JSON?▾
Yes. fwip highlights syntax errors with line and column numbers. Valid JSON is pretty-printed with proper indentation.
Can I minify JSON with fwip?▾
Yes. Toggle between formatted (pretty-printed) and minified (compact) output with one click.
// Related tools

You might also need.

DATA
JSON Validator
Validate JSON and find syntax errors.
 DATA
JSON Beautifier
Pretty-print JSON with indentation.
 DATA
JSON Minifier
Remove whitespace from JSON.
 DATA
CSV ↔ JSON
Convert between CSV and JSON formats.
 DATA
Diff Checker
Compare two texts. Line-by-line diffs.
 DATA
Base64
Encode and decode Base64 — text and files.

Like it? Own it.

Offline. No browser. No internet. No excuses.
$15
This tool
  • JSON Formatter · offline
  • Batch processing
  • No file size limit
  • 3 devices · one payment
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$99
Complete suite
  • All 200+ tools · offline
  • No file size limit
  • No daily use limit
  • 3 devices · one payment · updates included
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One-time payment · 3 devices · Updates included · Mac + Windows + Linux