JSON Formatter

Clean, format, and validate your JSON data instantly. All formatting happens locally in your browser—your data is never uploaded, stored, or sent to a server.

JSON Formatter – SynetrixTools

📥 Input JSON

Quick Samples

Load From

0 characters ⚠️ Large file — some operations run in chunks

Format Options

Indent: Sort Keys:

Syntax Highlighting Quote All Keys Trailing Comma Fix Unicode Escape

🔒

Private by design: All formatting and validation happens locally in your browser. Your JSON data is never sent to a server (URL fetch requests go directly from your browser to the URL you provide, not through our servers).

📤 Formatted Output

View:

Click a node to see its path

🔎 Query & Extract

Extract data using a simple dot/bracket path (e.g. data.users[0].name) or a basic jq-like filter (e.g. .data.users[].name or .[] | .price).

📐 JSON Schema Validation

Paste a JSON Schema (Draft-07 style) to validate the input against it. Supports type, required, properties, items, enum, and basic string/number constraints.

🔄 Convert

Convert JSON To

📊 JSON Statistics

Size (raw)

—

Size (formatted)

—

Keys

—

Depth

—

Arrays

—

Objects

—

Strings

—

Numbers

—

Nulls: — Booleans: — Valid: —

🔍 JSON Path Search

Search for a key name within the parsed JSON.

🔀 Compare / Diff

Paste a second JSON to compare against the input.

💡 JSON Tips

✅Keys must be double-quoted strings — single quotes are not valid JSON.
✅Trailing commas after the last item in an object or array are not allowed.
✅Use null instead of undefined — undefined is not a valid JSON value.
✅Comments are not part of the JSON spec — remove them before parsing.
✅All processing is local — your data never leaves your browser.

❓ Frequently Asked Questions

What is JSON? ▼

JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It is easy for humans to read and write, and easy for machines to parse and generate. JSON is language-independent and is widely used for APIs, configuration files, and data storage.

Is my data safe? ▼

Yes. All formatting, validation, and conversion happens entirely in your browser using JavaScript. Your JSON data is never transmitted to any server, stored in a database, or logged in any way. If you use the "Fetch URL" option, that request goes directly from your browser to the URL you provide.

What is the difference between formatting and minifying? ▼

Formatting (also called "pretty-printing") adds indentation and line breaks to make JSON human-readable. Minifying removes all unnecessary whitespace to produce the smallest possible output — ideal for reducing payload size in APIs and network requests.

Why does my JSON fail validation? ▼

Common causes include: trailing commas after the last item, single-quoted strings instead of double-quoted, unquoted keys, comments (not allowed in JSON), or missing/extra brackets and braces. The error message now includes the line and column number, plus a snippet of the surrounding text, to help pinpoint the exact issue.

What is JSON Schema validation? ▼

JSON Schema describes the expected shape of your data — required fields, types, and constraints. Paste a schema into the "JSON Schema Validation" section and this tool checks your input against it, highlighting every field that doesn't match.

How does the Query & Extract tool work? ▼

It supports simple dot/bracket paths (like data.users[0].name) as well as a lightweight jq-style syntax using . for keys, [] to iterate arrays, and | to pipe into another filter (e.g. .[] | .price). It is not a full jq implementation, but covers the most common extraction needs.

Can this handle large JSON files? ▼

Yes, within browser memory limits. Files over ~2MB show a performance notice, and heavier operations (like tree rendering) run in small asynchronous chunks to keep the page responsive rather than freezing the tab.

[adinserter name="Page Sidebar Ad Block"]