100% client-side — your data never leaves your browser

The JSON tool developers deserve

Format, validate, diff, and query JSON in one clean workspace. Tree view, syntax highlighting, and instant validation — no clutter, no data uploads.

data.json
{
  "name": "JSONLoom",
  "version": "1.0.0",
  "private": true,
  "features": [
    "format", "validate", "diff", "query"
  ],
  "stars": 9001
}

Everything you need for JSON, in one tab

Stop switching between 5 different JSON tools. JSONLoom combines formatting, validation, diff, and querying into a single, fast workspace.

Format & Beautify

One-click formatting with configurable indentation (2/4/tab). Minify for production. Copy or download the result instantly.

Validate with Precision

Instant validation with inline error markers. See exactly which line and column has the issue, with clear error messages.

Tree View Explorer

Collapsible tree view to navigate complex JSON structures. Search nodes, copy paths, and expand/collapse sections.

JSON Diff

Side-by-side structural comparison. See exactly what changed between two JSON documents. Additions, deletions, and modifications highlighted.

Pro

How It Works

1

Paste or Drop

Paste JSON from your clipboard or drag-and-drop a .json file. It loads instantly.

2

Format & Explore

Auto-format, switch to tree view, and validate instantly. Navigate complex structures with ease.

3

Copy & Go

Copy the formatted output to your clipboard or download as a .json file. Done in seconds.

100% Private

Data never leaves your browser

Instant Processing

Client-side parsing, zero uploads

Files up to 5MB Free

Pro handles 50MB+

Pricing

Format and validate for free. Upgrade for power features.

Prices shown exclude applicable taxes.

Free

$0forever
  • Unlimited formatting & validation
  • Tree view with search
  • Syntax highlighting & code folding
  • File drag-and-drop (up to 5MB)
  • Dark IDE theme
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Pro

$3/month
  • Everything in Free
  • JSON diff (side-by-side comparison)
  • JSONPath queries with live results
  • Large file support (up to 50MB)
  • Ad-free experience
Best Value

Crate Pass

$15/month
  • All Cashew Crate apps
  • Everything in Pro
  • No ads anywhere
  • New apps added regularly
  • Cancel anytime
Get Crate Pass — $15/mo

Prices shown exclude applicable taxes.

Frequently Asked Questions

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