JSON Validator & Formatter
Instantly validate, beautify, and minify your JSON data structures.
Invalid JSON
Error details will appear here.
About the JSON Validator Tool
JSON (JavaScript Object Notation) is the standard data format used for APIs and web development. However, a single missing comma or unescaped quote can break an entire application. The OnlinePaste.com JSON Validator instantly parses your code to locate exact syntax errors, allowing you to fix APIs faster.
Beautify & Compress
Often, server responses return "minified" JSON that is impossible for humans to read. Click the Beautify button to instantly format the raw data with perfect indentation. Conversely, if you are preparing a JSON payload to send to a server and want to save bandwidth, use the Minify button to strip all unnecessary whitespace.
100% Client-Side Parsing
JSON datasets frequently contain highly sensitive proprietary information, customer data, or secure API keys. We built this tool to prioritize your privacy. The entire parsing and formatting engine runs directly inside your web browser via JavaScript. Your JSON payloads are never uploaded, saved, or transmitted to our servers.