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DevPocketv2.1
● JSON

JSON Formatter & Beautifier

Format and beautify unformatted or minified JSON with customizable indentation.

Processed locally. Your input stays in this browser.
Indentation Spacing:
1 line•102 chars•102 B
Formatted JSON Output
12 lines•148 chars•148 B
Read-only output

What JSON Formatter & Beautifier Does

Fast, secure online JSON Formatter and beautifier. Indent JSON strings with custom spaces or tabs 100% in your browser.

Key Operations & Capabilities:

  • Format and beautify unformatted or minified JSON
  • Validate JSON syntax and detect error locations
  • Copy formatted output or download .json file
  • Minify JSON to single line string

Keyboard Shortcuts

Ctrl + EnterFormat JSON input
Ctrl + Shift + CCopy formatted result to clipboard
EscClear input editor

Common Syntax Error Diagnostics

SyntaxError: Unexpected token '
Cause: Single quotes were used instead of valid JSON double quotes.
Fix: Replace all single quotes (') with standard double quotes (").
SyntaxError: Unexpected token }
Cause: A trailing comma was left after the last array or object element.
Fix: Remove the comma after the last key-value pair.

How It Works

  • 1.Paste your raw, minified, or unformatted JSON string into the input editor.
  • 2.Choose your preferred indentation spacing (2 spaces, 4 spaces, or tab).
  • 3.Copy or download the formatted, beautified JSON output instantly.

Common Use Cases

  • •Beautifying minified API response payloads for debugging.
  • •Formatting JSON logs into readable multiline structures.
  • •Standardizing JSON formatting for code commits or config files.

Related Developer Guides

How to Format & Beautify JSON: Complete Developer Guide

Master JSON formatting across programming languages and tools. Learn about indentation, RFC 8259 standards, minification vs beautification, and CLI formatting.

Read Guide

JSON vs JSON5: Syntax Differences & Feature Comparison

Detailed comparison of standard JSON vs JSON5. Learn about single quotes, unquoted keys, trailing commas, comments, hexadecimal numbers, and multi-line strings.

Read Guide

How to Fix & Validate Malformed JSON: Step-by-Step Diagnostic Guide

Learn how to diagnose and fix invalid JSON errors including SyntaxError: Unexpected token, unexpected end of JSON input, trailing commas, and encoding issues.

Read Guide

Frequently Asked Questions

Is my JSON data sent to any server?

No. All JSON formatting happens entirely inside your browser using standard JavaScript APIs.

What indentation options are supported?

You can choose between 2 spaces, 4 spaces, or tab indentation.

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