Does this validate JSON syntax?

Yes, our tool validates your JSON syntax in real - time and shows clear error messages if there are any issues.

Can I use this for API debugging?

Absolutely. Paste API responses to format and inspect them easily. Great for debugging REST APIs and webhooks.

Does this work offline?

Yes, once the page is loaded, the tool works entirely in your browser and doesn't require an internet connection.

JSON Formatter - Online JSON Beautifier & Validator

All processing happens in your browser. Your JSON data is never sent to our servers.

Minified or messy JSON is difficult to read and debug, and a single missing comma or quote can break an entire API request or configuration.

Format, beautify, and validate JSON code instantly. Make your JSON readable with proper indentation.

Show detailed guide & explanations▼

Why you may need this tool

JSON is often shared as a single long line in logs, API responses, and webhook payloads. When JSON is compacted, it is hard to inspect nested structures or spot missing commas and braces. Even a small syntax issue can invalidate the entire payload. Formatting JSON into an indented, readable structure makes debugging faster and reduces the risk of editing mistakes.

How to use

Paste JSON, format it, and then follow the indentation to inspect nested keys and values.

Paste your JSON code into the input area
Click 'Format' to beautify or 'Minify' to compress
View any syntax errors highlighted
Copy the formatted result

Examples

Inspecting a one - line API response

A one - line response makes it hard to find specific keys in nested objects. Formatting exposes the structure so you can quickly locate the fields you need.

Spotting syntax issues before sending a payload

A missing comma or brace can invalidate a request body. Formatting helps you visually verify structure and narrow down where an error might be.

Benefits & differentiators

Pretty - printed JSON is easier to scan, review, and share. It helps you locate the exact part of a response or request that matters, and it makes it clearer when a field is missing or unexpectedly shaped. When you need to edit or validate JSON, formatting reduces the chance of breaking structure because you can see brackets and object boundaries clearly.

Who this is for

Recommended if you: - debug API responses, webhooks, or logs that contain JSON - need to share JSON snippets with teammates for review - edit JSON configuration or test payloads - want quick validation and readability improvements