JSON Validator

Paste your JSON in the left pane, choose an action, and see the result on the right.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate.

It is based on a subset of the JavaScript Programming Language and uses a text format that is language-independent, making it ideal for cross-platform data transmission. JSON represents data as structured key-value pairs, and supports basic data types such as strings, numbers, booleans, arrays, objects, and null. This makes it simple and effective for representing complex nested data in a clean and readable way.

Originally derived from JavaScript, JSON is now a widely accepted format across many programming languages including Python, Java, PHP, C#, Ruby, and Go. Its minimal syntax and native support in web browsershave made it the preferred choice for APIs, configuration files, and modern web services.

Key Characteristics of JSON:

Human-readable and text-based: Easy to write and understand.
Language-independent: Works across all modern programming environments.
Uses key-value pairs: Ideal for structured data exchange.
Supports arrays and nested objects: Enables modeling complex hierarchies.
Widely supported: Easily parsed and generated by most languages and tools.

JSON Validator – Check and Fix Invalid JSON

The JSON Validator helps you quickly detect and fix syntax errors in your JSON data. Whether you're debugging API responses, editing configuration files, or integrating external data sources, valid JSON is critical for smooth application behavior.

Why Use a JSON Validator?

Instant error detection: Identify missing commas, unmatched brackets, and other syntax issues in real time.
Improved API reliability: Ensure the JSON you send or receive is properly structured and standards-compliant.
Config file safety: Validate JSON used in environments like VSCode, ESLint, Firebase, or Kubernetes.
Development efficiency: Save time by validating and formatting JSON on the fly during development or testing.

How to Use the Tool

Paste your JSON code into the left editor.
Click the “Validate JSON” button in the center of the layout.
View results in the right panel — errors will be highlighted or you'll get a success message.

The tool supports both compact and pretty-printed JSON, works with deeply nested structures, and gives meaningful error messages to help you correct mistakes instantly. Great for frontend devs, backend engineers, and API consumers alike.

👉 Try the JSON Validator Tool

Need more tools? Try our JSON to XML Converter or JSON Diff Tool.