API Response Formatter
Format and beautify API responses in JSON, XML, or HTML with auto-detection and instant formatting.
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Your Privacy Matters
We don't store any of your data. All formatting happens locally in your browser. Only query parameters are included if you decide to share the URL.
API Response
Formatted Output
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How to Use the API Response Formatter
The API Response Formatter is an essential tool for developers working with web APIs, REST endpoints, GraphQL servers, and web services. Simply paste any API response into the input field, and the tool instantly formats it with proper indentation, making it easy to read and debug. The auto-detection feature automatically identifies whether your response is JSON, XML, HTML, or plain text, applying the appropriate formatting rules.
Unlike other formatters, this tool works in real-time as you type or paste. There's no "Format" button to click — the formatting happens automatically with a smooth 300ms debounce. This means you can paste large responses and see the formatted output appear instantly. The tool also provides detailed statistics including response size, line count, character count, and word count, helping you analyze and optimize your API responses.
For JSON responses, the formatter validates syntax and shows clear error messages if there are any parsing issues. It highlights the exact location of syntax errors, making it easy to fix malformed JSON from third-party APIs. The XML and HTML formatters ensure proper tag nesting and indentation, making it easy to spot structural issues in your markup.
The one-click Copy button makes it easy to grab the formatted output and paste it into your documentation, code comments, or bug reports. You can also use the Share button to generate a URL that encodes your response data in query parameters, allowing you to share API responses with teammates without using external services. Everything runs client-side in your browser — your API responses are never sent to our servers, making it safe for sensitive data.
Whether you're debugging a failing API call, documenting endpoints for your team, analyzing response payloads, or comparing API versions, this tool saves time and helps you work more efficiently. It's particularly useful when working with minified or compact API responses that are difficult to read in their raw form.
Frequently Asked Questions
What formats does the API Response Formatter support?
The tool supports JSON, XML, HTML, and plain text formats. It can auto-detect the format of your API response and apply the appropriate formatting. You can also manually select the format if auto-detection doesn't work for your use case.
How does auto-detection work?
Auto-detection analyzes the structure of your pasted content. If it starts with { or [, it's treated as JSON. If it starts with <?xml or HTML tags like <!DOCTYPE>, it's formatted as XML or HTML accordingly. You can disable auto-detection and manually choose the format.
Can I use this tool for debugging API responses?
Absolutely! This tool is perfect for debugging. It beautifies minified responses, validates JSON syntax, shows helpful error messages, and displays statistics like response size, line count, and character count. It's ideal for testing REST APIs, GraphQL endpoints, and web services.
Is my API response data secure?
Yes, completely secure. All formatting happens entirely in your browser using JavaScript. Your API responses are never sent to any server. This makes it safe to format responses containing sensitive data like API keys, tokens, or private information. We don't store any of your data.
Can I share formatted API responses with my team?
Yes! Use the Share button to generate a URL with your response data encoded in the query parameters. Your teammates can open the link to see the pre-filled, formatted response. Only the URL parameters are shared — we never store data on our servers.
What's the maximum response size I can format?
The tool can handle large API responses, typically up to several megabytes, depending on your browser's memory. For very large responses (100MB+), you may experience slower performance. For optimal experience, we recommend responses under 10MB.