Online JSON Formatter & Validator

Beautify, minify, escape & explore JSON
100% client-side

Free Online JSON Formatter & Validator

This free online JSON formatter helps developers, analysts, and business users format, validate, minify, escape, and visualize JSON data instantly. It is commonly used to debug API responses, inspect configuration files, and improve readability of structured data.

All JSON processing happens directly in your browser. No data is uploaded, stored, or shared with any server, making this tool safe for large and sensitive JSON payloads.

Output
Paste JSON and click Format JSON

JSON Knowledge Base

JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It has become the industry standard for data exchange in modern web applications, APIs, microservices, and cloud-native systems.

Why JSON is widely used

  • Language-independent: JSON is supported by almost every programming language.
  • Human-readable: Its simple key–value structure is easy to understand and debug.
  • Lightweight: Compared to XML, JSON is more compact and faster to transmit.
  • API-friendly: Most REST APIs use JSON as their default data format.

Common JSON Operations

  • Format / Beautify: Makes JSON readable by adding indentation and line breaks.
  • Minify: Removes whitespace to reduce payload size for faster transmission.
  • Escape: Converts JSON into a string-safe format for logs, environment variables, or code embedding.
  • Unescape: Converts escaped JSON strings back into valid JSON objects.
  • Object View: Visualizes deeply nested JSON structures in an expandable tree format.

Frequently Asked Questions (FAQ)

Yes. This JSON formatter is completely free and does not require registration, login, or payment. You can use it for personal, educational, or professional work.
No. All JSON processing happens entirely within your browser. Your data is never uploaded, stored, logged, or shared with any server.
JSON follows a strict specification. Common issues include missing quotes, trailing commas, mismatched braces, invalid characters, or comments. The formatter highlights errors to help you fix them quickly.
Minifying JSON removes unnecessary whitespace to reduce size, while escaping JSON converts it into a string-safe format so it can be embedded inside source code, configuration files, or environment variables.
Yes. Since all operations are performed locally in your browser, this tool is suitable for handling large payloads and sensitive data without security concerns.
Yes. Any JSON that conforms to the official JSON specification (RFC 8259) is supported, including deeply nested objects and large arrays.