Format, validate, and minify JSON instantly. This tool works fully in your browser — fast, secure, and developer-friendly.

Input JSON

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Or drop a file here.

Formatted Output

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What is a JSON Formatter?

A JSON formatter is a developer tool that converts raw or minified JSON into a human-readable format. It helps developers debug APIs, inspect responses, and validate JSON structure.

Why use this JSON Formatter?

• Runs fully in your browser (no data upload)
• Supports large JSON files
• Instant formatting and validation
• Developer-friendly UI with keyboard shortcuts

How to Format JSON Online

Formatting JSON online makes raw or minified JSON data readable by applying proper indentation and structure. This is especially useful when debugging API responses or reviewing large JSON payloads.

With DevToolkit’s JSON Formatter, you can paste JSON directly into the editor, upload a JSON file, or drag and drop a file to instantly format and validate it. Errors are highlighted with exact line numbers, making it easy to fix issues quickly.

JSON Formatter Use Cases

• Debugging REST and GraphQL API responses
• Validating third-party JSON data
• Inspecting large JSON files without freezing the browser
• Preparing JSON for backend services and databases

Is This JSON Formatter Secure?

Yes. All JSON processing happens locally in your browser. Your data is never uploaded to any server, ensuring complete privacy and security.

FAQs

What does the JSON Formatter do?

The JSON Formatter beautifies and validates JSON data, making it easier to read, debug, and understand API responses or configuration files.

Is this JSON Formatter free?

Yes. The formatter is free to use for standard JSON formatting and validation.

Is my JSON data safe?

Yes. All formatting happens directly in your browser. Your data is never uploaded to any server.

Does it support large JSON files?

Large JSON files are supported with optimized processing. Extremely large files may require Pro features.