JSON tool

JSON Formatter & Validator

Format, minify, validate and debug JSON data with clear error feedback.

Tool Workspace

Processing is intended to run locally in your browser whenever possible. Avoid pasting production secrets, access tokens, private keys or sensitive business data into any online tool unless you fully understand the risk.

Ready. Processing runs in your browser.

Raw JSON

Formatted JSON

Core Features

Beautify JSON with indentation.
Minify JSON for compact API payloads.
Validate syntax and show readable error messages.
Load sample payloads for quick testing.

How to Use

Paste copied JSON into the input editor.
Click Format to make nested objects and arrays readable.
Use Validate when an API response fails inside JSON.parse.
Click Minify when you need a compact payload for tests or transport.

Common Errors

Unexpected token in JSON.
Trailing comma after the last property.
Unclosed string or invalid escape character.
JSON with comments, which is not valid JSON.

Real Developer Use Cases

Debugging API responses copied from DevTools.
Checking webhook payloads before integration tests.
Formatting configuration files before deployment.

Technical Explanation

JSON is strict data syntax, not a JavaScript object literal. Small details such as trailing commas, unescaped quotes, comments or empty responses can break parsing even when the payload looks familiar. A formatter and validator helps developers separate readability problems from real syntax problems, inspect nested structures quickly and prepare compact payloads for tests or API clients.