Zlvox Tools

JSON Formatter

Format, validate, beautify, minify and diff JSON instantly in your browser. Zero server calls -- your data never leaves your device.

Beautify Minify Validate Sort Keys Diff / Compare Key Search 100% Client-Side
0Server calls
100%Private
FreeAlways
Awaiting input
Options
Editor
Input 0 chars
Raw JSON 0 chars
Formatted Output --
Input size
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Output size
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Keys found
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Depth
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Saved
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Mode
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Compare two JSON payloads
JSON A
JSON B
Diff Result
Paste two JSON payloads above and click Compare.
Features
Absolute Privacy
Your JSON never leaves your browser. Zero server calls, zero transit exposure. API keys, tokens, and private configs are completely safe to paste here.
Live Validation
Instant syntax validation on every keystroke. The status badge turns green for valid, red for broken. Catch errors the moment you type them.
Sort Keys
Sort all object keys alphabetically at every nesting level. Essential for comparing two JSON blobs or normalizing config files before committing to git.
Diff / Compare
Paste two JSON payloads and see exactly which keys were added, removed or changed. Line-by-line diff with color coding -- green for additions, red for removals.
Key Path Search
After formatting, search and filter output by key name. Find any nested path instantly without scrolling through hundreds of lines of formatted JSON.
Escape / Unescape
Convert JSON to an escaped string for embedding in code, or unescape a JSON string back to a readable object. Both operations work on the current input content.
Common questions

Everything you need to know

What is a JSON formatter and why do developers need it?

A JSON formatter converts minified or poorly-structured JSON into a human-readable indented layout. API responses and database exports often arrive as a single line -- a formatter adds proper indentation so the structure becomes immediately visible and scannable.

API DebuggingDev EssentialData Inspection
Is my data safe? Does it get sent to a server?

Completely safe. This tool runs 100% in your browser using client-side JavaScript. Your data never leaves your device -- no server request, no database write, no log file. You can verify this by opening the browser Network tab and observing that zero requests are made when you click Format.

Zero server calls100% local
What is the difference between formatting and minifying?

Formatting (beautifying) adds indentation and line breaks to make JSON human-readable -- ideal for debugging. Minifying removes all whitespace to make the smallest possible file -- ideal for production APIs and storage where every byte counts.

Formatting = readableMinify = smallest
What does "Sort Keys" do?

Sort Keys alphabetically orders every object's keys at every nesting level. This is essential for diffing two JSON blobs -- without sorted keys, two identical objects can look different if keys were inserted in different orders. It also helps with git diffs in config files.

What does the Diff / Compare feature do?

The Diff tab lets you paste two JSON payloads and see exactly which flat keys differ between them. Added keys are shown in green, removed keys in red, and changed values are highlighted. Both inputs are flattened and compared at the key level.

Added = greenRemoved = red
What are Escape and Unescape for?

Escape converts a JSON object into a string with backslash escapes -- useful when you need to embed JSON as a string value inside another JSON, or store it in a database column. Unescape reverses this, converting an escaped JSON string back to a readable object.

Is this tool free? Do I need an account?

100% free -- forever. No account, no signup, no credit card, no usage limits. Open the page, paste JSON, format. All Zlvox developer tools are freely accessible to everyone with no premium tiers.

100% freeNo signupUnlimited use