JSON Formatter Pro
Features How it works Pricing FAQ Add to Chrome
⚡ For developers, by developers

The JSON tool every developer wishes they installed sooner.

Format, validate, query, and diff JSON in one click. JSONPath, JSON Schema validation, side-by-side diff, and saved history , all without uploading a byte.

Add to Chrome , Free See Pro plans
● 100% local processing ● No signup required ● Manifest V3
chrome-extension://json-formatter-pro/
JSON Formatter Pro Pro
{"users":[{"id":1,"name":"Ada"}],"version":"2.4.0"}
Format Minify Validate
{
  "users": [
    {
      "id": 1,
      "name": "Ada"
    }
  ],
  "version": "2.4.0"
}
<50ms
to format 1MB JSON
~80KB
extension size
0
data uploaded, ever
11
supported languages

Everything you need for JSON, nothing you don't

Built by developers tired of toggling between five tools. Format, validate, query, and diff , in one popup.

⚡

Pretty-print & minify

2-space, 4-space, or tab indents. Minify to a single line for clipboard or curl. Native parser, instant feedback.

✓

Precise validation

Errors point to the exact line and column , not just a byte offset. Find that missing comma in seconds.

🌳

Collapsible tree view

Syntax-highlighted, expandable / collapsible nodes. Drill into any depth without losing your place.

⌕

JSONPath queries

Pluck values from deeply nested payloads with $.users[*].email. Wildcards, slices, recursive descent.

🛡️

JSON Schema validation

Paste a draft-07 schema and instantly see which fields fail. Type, required, enum, oneOf / anyOf / allOf.

⇄

Side-by-side diff

Compare two payloads. Added, removed, changed entries with dotted paths and value highlights.

⟲

Saved history

Last 50 payloads kept locally. Restore yesterday's response with one click.

↧

Export to anything

Convert to spreadsheet-ready CSV, friendlier YAML, or TOML config files. All without leaving the popup.

🔒

Privacy-first

Your data never leaves your browser. No upload, no cloud, no tracking pixels. Manifest V3, lint-clean.

From paste to formatted in three seconds

No accounts, no setup. Pin once, then click whenever you need it.

1

Install

Add to Chrome from the Web Store. Zero config, zero signup.

2

Pin

Click the puzzle icon, find JSON Formatter Pro, hit the pin. Done forever.

3

Click & paste

Open the popup, paste your JSON, or hit "Load from tab" if you're already viewing a JSON response.

4

Format

Click Format. The tree view appears with syntax colors. Use Pro tools for queries, schema, or diff.

Simple pricing. No subscription lock-in.

Start free. Upgrade only if you need the Pro tools.

Free
$0
Forever. No card. No signup.
  • Pretty-print & minify
  • Validate with line / col errors
  • Collapsible tree view
  • Copy & download
  • Last 5 payloads in history
  • 20 formats per day
Add to Chrome
Best value
Pro · Lifetime
$9.99 once
Or $2.99/month if you prefer to subscribe.
  • Everything in Free
  • JSONPath queries
  • JSON Schema validation
  • Side-by-side diff
  • History of last 50 payloads
  • Export to CSV / YAML / TOML
  • Unlimited daily formats
Get lifetime access

Frequently asked questions

Everything you need to know before installing.

Does my JSON ever leave my browser?
No. All formatting, validation, querying, schema checks, and diffs happen 100% locally inside the extension popup. The only network calls the extension makes are a license check (sending only a random device ID) and anonymous funnel counts. Your actual JSON content never gets uploaded.
Why does the extension need permissions?
Five permissions, all minimal. storage for settings & history. activeTab + scripting for the "Load from tab" button (only fires when you click). downloads for the Download button. A single host permission for peakproductivity.online (license verify). No <all_urls>, no background scraping.
How big a payload can it handle?
Tested cleanly up to 5MB. Native JSON parsing scales with your machine's memory. The tree view lazy-renders deep nodes so even huge payloads stay smooth.
What's the difference between Monthly and Lifetime?
Identical Pro features. Monthly is $2.99/month, Lifetime is $9.99 once. Lifetime pays for itself in four months and includes all future updates forever.
Can I get a refund?
Yes. Within 30 days of purchase, email support@peakproductivity.online and we'll refund , no questions.
Does it work offline?
Every Free feature works without a network connection. Pro license verification needs network the first time, then caches for 24 hours, so you can keep working offline.
What's the JSONPath syntax you support?
Root $, dotted properties .foo, indices [0], unions [1,3], slices [0:5], wildcards [*], and recursive descent ..foo. No filter expressions yet , that's on the roadmap.
Is the source code open?
The extension is closed source today, but bundled clean (no obfuscation, no remote code, Manifest V3 compliant). All processing logic ships inside the package and is reviewable in the loaded extension.

Ready to never fight JSON again?

One click to install. No signup. No card required.

Add to Chrome , it's free