JSON Formatter & Validator

Format, minify, and validate your JSON data instantly.

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Output

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What is a JSON Formatter?

A JSON formatter is a tool that takes raw or compact JSON data and transforms it into a human-readable structure with proper indentation, line breaks, and spacing. It can also validate your JSON to catch syntax errors such as missing commas, unmatched brackets, or trailing characters, and minify it by stripping all unnecessary whitespace to produce the smallest possible output.

Developers frequently need a JSON formatter when working with webhook payloads, API responses, configuration files, and log output. Raw JSON from an API endpoint or webhook delivery is often a single compressed line that is nearly impossible to read. Formatting it instantly reveals the structure of the data, making it far easier to debug issues, verify field values, and understand nested relationships.

How to Use

1 Paste your JSON — Drop raw JSON from a webhook payload, API response, config file, or any other source into the input panel.
2 Choose a mode — Select Format to pretty-print with indentation, Minify to compress into a single line, or Validate to check for syntax errors.
3 Get instant results — The output appears immediately in the right panel. Click Copy to grab the result to your clipboard.

Features

Real-time Formatting

JSON is formatted as you type. No need to press a button — results update instantly in the output panel.

Syntax Error Detection

Pinpoints exactly what went wrong with descriptive error messages including position information so you can fix issues fast.

Configurable Indentation

Choose between 2 spaces, 4 spaces, or tabs to match your project's coding style and preferences.

One-click Copy

Copy the formatted, minified, or validated output to your clipboard with a single click, ready to paste anywhere.

When to Use JSON Formatting

• Debugging webhook payloads — Quickly make sense of incoming webhook data by expanding compressed JSON into a readable structure.
• Reading API responses — Format raw API output to inspect field values, check nested objects, and verify data integrity.
• Preparing test data — Validate and format JSON fixtures before using them in automated tests or manual API calls.
• Validating configuration files — Catch syntax errors in JSON config files before deploying to avoid runtime failures.

FAQ

Is my JSON processed server-side?

No, everything runs entirely in your browser. Your JSON data never leaves your machine and is not sent to any server.

What's the difference between format and beautify?

They are the same thing. Both operations add proper indentation and line breaks to make JSON human-readable. The terms are used interchangeably.

Can I format large JSON files?

Yes, this tool works with any size JSON that fits in your browser's memory. For most use cases — webhook payloads, API responses, config files — there are no practical limits.

Need to inspect webhook payloads?

HookWatch captures and stores every webhook payload with full request details.

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