Find answers to the most frequently asked questions about our free online JSON viewer, formatter, and validator. If you don't find what you're looking for, please visit our Contact page.
Yes, our JSON viewer is completely free to use. There are no hidden fees, no subscription required, and no premium features locked behind a paywall. You can use all features including JSON formatting, minification, validation, and tree view without any cost.
Absolutely. Your data security is our top priority. All JSON processing happens entirely in your browser using client-side JavaScript. Your data never leaves your deviceāit's not sent to any server, stored in any database, or shared with third parties. This means you can safely use our tool even with sensitive or confidential data.
Our JSON viewer can handle most typical JSON files including API responses, configuration files, and log entries. Very large files (several megabytes) may be limited by your browser's memory capacity. For extremely large files, we recommend using specialized tools designed for streaming JSON parsing. Most everyday JSON files work perfectly with our tool.
Once you load the page, you can use the JSON viewer offline. All processing is done client-side, so no internet connection is required after the initial page load. This makes it perfect for working in secure environments or when you don't have internet access.
Our JSON viewer works with all modern browsers including:
The tool requires JavaScript to be enabled and uses modern browser APIs. Older browsers may not be fully supported.
Our JSON viewer stands out in several ways:
No, we do not store any JSON data. Everything you paste into the tool is processed in your browser's memory only. When you refresh the page or close the browser tab, all data is cleared. We don't have access to your data, and there's no way for us to retrieve or view what you've pasted.
Our tool validates JSON before formatting. If your JSON is invalid, you'll see a clear error message indicating
what's wrong. However, the tool does attempt to extract JSON from common log formats (like [INFO] {...})
and can sometimes recover from missing braces. For best results, start with valid JSON.
Format (also called "pretty-print" or "beautify") adds indentation and line breaks to make JSON human-readable. This is useful for development, debugging, and documentation. Minify removes all unnecessary whitespace to create the smallest possible JSON string. This is useful for API requests, storage, and production use where file size matters.
After pasting JSON in the Text tab, click the "Tree" tab to see a visual, hierarchical representation of your
JSON. You can click the - or + symbols to collapse or expand nodes. Use "Expand All"
to see everything at once, or "Collapse All" for a high-level overview. The tree view uses color coding to
distinguish between keys, strings, numbers, booleans, and null values.
Yes, you can copy the formatted or minified JSON directly from the text area. Simply select the text and use Ctrl+C (or Cmd+C on Mac) to copy, or right-click and select "Copy". The formatted JSON is ready to paste into your code editor, documentation, or wherever you need it.
Yes, our JSON viewer works perfectly with JSON from APIs. Simply copy the API response and paste it into the tool. You can format it for readability, validate it to check for errors, or explore it using the tree view. This is especially useful when debugging API integrations or documenting API responses.
If you paste invalid JSON, the tool will display a red error message below the text area. The error message will indicate what's wrong with your JSON, such as "Unexpected token" or "Missing closing bracket". This helps you quickly identify and fix JSON syntax errors.
Yes, you can use our tool with production data. Since all processing happens in your browser and no data is transmitted to servers, it's safe to use with sensitive information. However, as a best practice, always be cautious when working with sensitive data in any web-based tool, even client-side ones.
There's no hard-coded file size limit in our tool, but very large files may be limited by your browser's available memory. Most JSON files (up to several megabytes) work fine. If you encounter issues with very large files, consider splitting them into smaller chunks or using specialized streaming JSON parsers.
Standard JSON doesn't support comments, and our tool follows the JSON specification strictly. If you paste JSON
with comments (like // comment or /* comment */), you'll get a validation error.
You'll need to remove comments before using the tool. Some developers use fields like "_comment"
to include documentation in JSON.
While our tool doesn't have a built-in save feature, you can easily save your formatted JSON by copying it
and pasting it into a text file, code editor, or any application that accepts text. The formatted JSON is
ready to use and can be saved with any file extension you prefer (typically .json).
Our JSON validation is 100% accurate and follows the official JSON specification (RFC 7159). The validator checks for proper syntax, valid data types, correct quoting, and proper structure. If JSON passes validation, it will parse correctly in any JSON-compliant parser.
Yes, our JSON viewer works on mobile devices including smartphones and tablets. The interface is responsive and adapts to smaller screens. However, working with large JSON files on mobile may be less convenient due to screen size and input methods. For best experience, we recommend using a desktop or laptop computer.
We may collect basic, anonymous analytics to understand how the tool is used and improve its performance. This includes information like page views and feature usage, but never includes the actual JSON data you paste. Your JSON content is never tracked, logged, or analyzed. For more details, please see our Privacy Policy.
If you encounter a bug or issue with the JSON viewer, please visit our Contact page to report it. Include details about what you were trying to do, what happened, and any error messages you saw. Your feedback helps us improve the tool for everyone.
Absolutely! We welcome feature suggestions and ideas for improving the JSON viewer. Please visit our Contact page to share your ideas. While we can't implement every suggestion, we carefully consider all feedback and prioritize features that benefit the most users.