Онлайн-форматтер, валидатор и украситель JSON

What is JSON Formatter & Validator?

The JSON Formatter and Validator takes raw, minified, or malformed JSON and transforms it into clean, properly indented, readable code. It validates JSON syntax with precise error locations — highlighting the exact line and character of any problem — and offers three output modes: beautified, minified, and interactive tree view. This makes it the complete browser-based tool for formatting, debugging, and exploring JSON data without needing a code editor.

JSON (JavaScript Object Notation) is the universal data format for REST APIs, configuration files, and NoSQL databases across virtually every technology stack. API responses and webhook payloads regularly arrive as dense, single-line strings that are impossible to read without formatting. The formatter transforms any JSON into readable, well-structured code in seconds.

Why Use JSON Formatter & Validator?

API responses, database exports, and configuration files regularly arrive as single-line, unformatted JSON strings. This formatter makes any JSON immediately human-readable, validates it for syntax errors before those errors break your application, and provides tree-view navigation for exploring deeply nested structures — all in seconds, directly in the browser without installing any tools.

Key Features of JSON Formatter & Validator

• ✓Beautifies JSON with configurable indentation (2 spaces, 4 spaces, or tabs)
• ✓Validates JSON syntax with precise error highlighting — shows exact line and column
• ✓Minifies JSON to the smallest possible string for production payloads
• ✓Interactive tree view for exploring nested objects and arrays
• ✓Supports JSON5 with trailing commas and inline comments
• ✓Copy to clipboard or download as a .json file

How to Use JSON Formatter & Validator

1. 1

   Paste your JSON

   Enter raw, minified, or potentially invalid JSON into the input area.

2. 2

   Format or validate

   Click Format to beautify, or Validate to check syntax. Invalid JSON shows the exact error location.

3. 3

   Review the output

   See clean, indented JSON. Review any error messages with precise line and column references.

4. 4

   Fix errors if present

   Common fixes: remove trailing commas, add double quotes around keys, close open brackets, escape backslashes in strings.

5. 5

   Copy or download

   Copy the formatted JSON to clipboard or download as a .json file for use in your project.

Frequently Asked Questions about JSON Formatter & Validator