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JSON Formatter
Format, validate, and beautify JSON code online with syntax highlighting.
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📋 How to Use
- Paste your JSON code into the input area.
- Click "Format JSON" to beautify and validate.
- If the JSON is valid, the formatted output appears with syntax highlighting.
- If there are errors, the exact error location and type is shown.
- Copy the formatted JSON or use "Minify" for compact output.
Tip: Press Ctrl+V to quickly paste JSON from your clipboard.
About This Tool
JSON Formatter & Validator — Free Online JSON Beautifier
JSON (JavaScript Object Notation) is the most widely used data interchange format in modern web development, APIs, and configuration files. Our free JSON formatter makes it easy to read, validate, and debug JSON data.
What Does the JSON Formatter Do?
- Beautify: Converts minified/compact JSON into readable, indented format with proper whitespace.
- Validate: Instantly detects syntax errors and shows exactly where the error occurs.
- Minify: Removes all whitespace to create compact JSON for production use.
- Syntax highlighting: Color-codes keys, values, strings, numbers, booleans, and null values.
Common Use Cases
- API development: Debug API responses by pasting the raw JSON output and formatting it for readability.
- Configuration files: Format package.json, tsconfig.json, and other configuration files.
- Data inspection: Make sense of complex nested JSON structures from databases or third-party services.
- Code review: Format JSON before pasting it into documentation, tickets, or pull requests.
- Learning: Understand JSON structure visually with proper indentation.
Why Valid JSON Matters
Invalid JSON causes application crashes, API errors, and data corruption. Common JSON errors include:
- Missing or extra commas
- Unquoted keys
- Single quotes instead of double quotes
- Trailing commas after the last element
- Unescaped special characters in strings
Our validator catches all of these instantly.
JSON Formatting Standards
JSON follows strict formatting rules defined in RFC 7159:
- Keys must be strings in double quotes
- Values can be strings, numbers, objects, arrays, true, false, or null
- No comments allowed
- No trailing commas
- Must have a single root element
❓ Frequently Asked Questions
JSON (JavaScript Object Notation) is a lightweight text format for storing and transporting data. It is easy for humans to read and write and easy for machines to parse and generate.
Missing commas, extra commas, unquoted keys, single quotes instead of double quotes, trailing commas, unescaped characters, and structural errors.
Format adds indentation and line breaks for readability. Minify removes all whitespace to create the smallest possible JSON string.
Yes. The tool handles large JSON documents efficiently.
JSON formatting is processed entirely in your browser — your data never leaves your device.
Yes, completely free with no registration required.
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