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JSON Formatter & Validator

Format, beautify, and validate JSON data online

How to Use the JSON Formatter

1. Paste your JSON into the input area on the left 2. Click Format to beautify with proper indentation 3. Click Minify to compress into a single line 4. Copy the result using the copy button

Understanding JSON Syntax

JSON (JavaScript Object Notation) is a lightweight data interchange format. Valid JSON must follow these rules:

  • Objects are wrapped in curly braces {}
  • Arrays are wrapped in square brackets []
  • Keys must be strings in double quotes
  • Values can be strings, numbers, booleans, null, objects, or arrays
  • No trailing commas after the last element

Common Use Cases

  • API Development: Format API responses for debugging
  • Configuration Files: Validate config.json files before deployment
  • Data Migration: Clean up JSON exports from databases
  • Code Review: Make JSON payloads readable in pull requests

Frequently Asked Questions

What is JSON formatting?

JSON formatting (or beautifying) is the process of adding proper indentation, line breaks, and spacing to JSON data to make it human-readable. Minified JSON saves bandwidth but is hard to read; formatted JSON is easier to debug and understand.

Is my JSON data secure when using this tool?

Yes, completely. This JSON formatter runs entirely in your browser using JavaScript. Your data never leaves your computer and is not sent to any server. You can verify this by checking your browser's network tab.

What makes JSON invalid?

Common JSON syntax errors include: trailing commas after the last item, single quotes instead of double quotes, unquoted keys, missing colons or commas, and undefined or NaN values which are not valid in JSON.

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Specialized Versions

Try our targeted calculators for specific use cases:

JSON Beautifier
Beautify and format JSON
JSON Minifier
Minify and compress JSON
JSON to TypeScript Interface Converter
Generate TypeScript types from JSON
JSON Validator
Validate JSON syntax
JSON Path Finder
Find paths in JSON
JSON to CSV Converter
JSON to CSV Converter
CSV to JSON Converter
CSV to JSON Converter
JSON to XML Converter
JSON to XML Converter
XML to JSON Converter
XML to JSON Converter
JSON to YAML Converter
JSON to YAML Converter
YAML to JSON Converter
YAML to JSON Converter
JSON Diff Tool
JSON Diff Tool
JSON Schema Validator
JSON Schema Validator
JSON Key Sorter
JSON Key Sorter
JSON Flattener
JSON Flattener
JSON to Java Class
JSON to Java Class
JSON to Python
JSON to Python
JSON to C#
JSON to C#
JSON to Go Struct
JSON to Go Struct
JSON to Kotlin
JSON to Kotlin
JSON to Swift
JSON to Swift
JSON Escape Tool
JSON Escape Tool
JSON Unescape Tool
JSON Unescape Tool
JSON to PHP Array
JSON to PHP Array
JSON to Ruby Hash
JSON to Ruby Hash