Developer Tools

JSONLoom

Format, validate, diff, and query JSON in your browser. Tree view, syntax highlighting, JSONPath queries, and side-by-side diff — all client-side, all private.

Open JSONLoom

What you get

Features

One-click format, beautify, and minify
Instant validation with inline error markers
Collapsible tree view explorer
Side-by-side JSON diff (Pro)

Privacy first

Built for your browser

JSONLoom is designed to be fast, simple, and distraction-free. Open it in any modern browser and get started in seconds — no downloads, no installations, no account required.

Most of our file tools process everything locally in your browser. Productivity tools store data locally by default with optional cloud sync when you sign in.

Get started

How it works

01Open JSONLoom in your browser
02Select or drag & drop your file
03The tool processes it locally using browser APIs
04Download your result — done!

Learn more

Reports

2026 Developer and Data Tool Report: Free JSON, CSV, Code, and Chart Tools Evaluated

Evaluation of 4 free browser-based developer utilities: JSON formatting, code diffing, CSV cleaning, and chart generation. Includes feature verification, comparison tables, and use-case recommendations.

2026-02-247 min read

Comparisons

Best Free JSON Formatters & Validators in 2026

We compared the top free online JSON tools on formatting speed, validation, privacy, and extra features like tree view and diff. Here's what's worth using in 2026.

2026-02-155 min read

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