data_object

Welcome to JSON Formatter Pro

Format, validate, query, and diff JSON in one click. Privacy-first. your data never leaves your browser.

Pin It To Your Toolbar

Click the extension Extensions puzzle icon in Chrome's toolbar.

data_object

JSON Formatter Pro

push_pin

Other extension

Find JSON Formatter Pro and click the pin icon.

The icon now appears in your toolbar , one click away whenever you need it.

How To Use

Open the popup

Click the JSON Formatter Pro icon in your toolbar. The popup opens instantly , no sign-up, no account, nothing leaves your browser.

Paste JSON, or "Load from tab"

Paste a payload, or hit Load from tab if you are already viewing a JSON response in another Chrome tab.

{
  "users": [
    { "id": 1, "name": "Ada", "active": true },
    { "id": 2, "name": "Linus", "active": false }
  ]
}

Click Format. Then Pro tools.

Format gives you the syntax-colored, collapsible tree. From there, run JSONPath, Schema, Diff, History, or Export: all in the same popup.

Key Features

format_align_left

Pretty-print & minify

2-space, 4-space, or tab indents. One-line minify for clipboard or curl.

check_circle

Validation with line + column

Errors point to the exact line and column , not just a byte offset.

account_tree

Collapsible tree view

Syntax-highlighted, expandable nodes. Drill into any depth.

JSONPath queries (Pro)

Pluck values with $.users[*].email. Wildcards, slices, recursive descent.

rule

JSON Schema validation (Pro)

Paste a draft-07 schema, see exactly which fields fail.

compare_arrows

Side-by-side diff (Pro)

Spot drift between two responses. Added, removed, changed entries.

history

History & export (Pro)

Last 50 payloads kept locally. Export to CSV / YAML / TOML.

lock

100% Private

All processing local. No upload, no cloud, no tracking pixels.

Unlock all Pro features , $9.99 lifetime arrow_forward

Free JSON & API Tips

Smarter JSON workflows, weekly.

Pragmatic tips for working with JSON, APIs, and developer tooling. No fluff, easy to unsubscribe.

check
JSONPath cheat sheet (you'll get it in your first email)
check
The diff trick that catches 80% of staging-vs-prod bugs
check
3-minute schema validation that prevents broken contracts

Join developers from Stripe, Shopify, Vercel

star star star star star

shield 100% Free & Private

mic

Stop Typing. Start Talking.

StarWhisper turns your voice into text instantly. Works offline, 99% accurate, completely private , perfect for dictating commit messages, comments, and PR descriptions.

wifi_off Works Offline

check_circle 99% Accurate

lock 100% Private

Try StarWhisper Free arrow_forward

No account needed · Works instantly