What JSON errors can this tool detect?

It detects missing commas, unclosed brackets/braces, trailing commas, duplicate keys, and invalid value types.

Is there a size limit for the JSON input?

Since processing happens in your browser, the limit depends on your device memory. It handles files up to several MB comfortably.

What is the difference between format and minify?

Formatting adds indentation and line breaks for readability. Minifying removes all whitespace to reduce file size for production.

JSON Formatter

Format, validate, and minify JSON. Precisely detect syntax errors.

Input

Indentation:

Online JSON Formatter, Validator, and Minifier

Working with APIs and raw data structures can be complex if they are not correctly formatted. Our Online JSON Formatter allows you to tabulate, structure, verify and detect errors in your JSON code instantly and privately.

Main Features

Format and Beautify: Converts unreadable JSON strings into a clean structure with customizable indentation (2, 4, or 8 spaces).
Validate Syntax: Instantly detects missing quotes, trailing commas, or unclosed brackets, indicating the reason for the error.
Minify / Compress: Removes all spaces and line breaks to reduce payload size before sending API responses.

Frequently Asked Questions (FAQ)

Is it safe to paste private JSON code or tokens here?

Completely. This tool runs 100% client-side (in your local browser). No JSON data inserted into this text field is sent to any external server.

Free JSON Formatter & Validator Online

JSON (JavaScript Object Notation) is the backbone of modern web development, used in APIs, configuration files, and data exchange between services. However, raw JSON from APIs or logs is often compressed into a single unreadable line. Our free JSON formatter transforms messy JSON into beautifully indented, color-highlighted, and human-readable code in milliseconds.

Beyond formatting, the tool provides real-time validation that pinpoints exact syntax errors — missing commas, unclosed brackets, or invalid values — with line numbers and descriptive error messages. You can also minify formatted JSON back to a compact single-line format for production use, reducing payload sizes for faster API responses.

How to Use This Tool

Paste your raw JSON into the input area.
Click "Format" to beautify it with proper indentation, or "Minify" to compress it.
Review any syntax errors highlighted in red, then copy the result.

Frequently Asked Questions

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