Format JSON from REST API Response

What is this JSON Formatter?

This is a free, real-time JSON formatter and validator that runs 100% in your browser. No data is sent to any server. It supports formatting (beautifying), minifying, sorting keys alphabetically, and real-time validation with line-accurate error messages.

How does JSON formatting work?

JSON.parse() converts your text into an in-memory JavaScript object, then JSON.stringify() renders it back with proper indentation. This also validates the JSON as a side effect " any syntax errors are caught and displayed with the exact character position.

Is my data safe?

All processing is done entirely in your browser's memory using JavaScript. No data is sent to any server. When you close this tab, the data is gone. This makes it safe to use with API keys, tokens, or private configuration files.

What does "Sort Keys" do?

It recursively sorts all object keys alphabetically throughout the entire JSON structure. Useful for comparing two JSON objects for differences or enforcing consistent key ordering in config files.

What is JSON minifying?

Minifying removes all whitespace, newlines, and indentation from valid JSON. The result is functionally identical but smaller " useful for reducing payload size in HTTP API responses or configuration files.

How to Use This Tool

Format JSON responses from REST APIs, webhooks, and server endpoints into clean, readable output for debugging and documentation.

Fetch your API response using curl, Postman, fetch(), or browser DevTools.

Copy the raw JSON response body.

Paste into the input pane and click "Format."

The output shows the full response structure with proper indentation and syntax highlighting.

Use "Sort Keys" for consistent field ordering across multiple API responses.

What Is Format JSON from API Response?

API responses are delivered as minified JSON to reduce bandwidth. This tool converts those compact responses into human-readable format with proper indentation and visual structure.

Works with any JSON-producing endpoint: REST APIs, GraphQL responses, webhook payloads from services like Stripe and GitHub, and server-sent event data.

All formatting runs client-side — safe for responses containing authentication tokens, user data, or internal system information.

Why You Need This

Essential for API development workflows:

Inspect endpoint responses during development and debugging.

Create API documentation with formatted example responses.

Attach readable responses to bug reports and support tickets.

Compare responses between staging and production environments.

Pro Tips for Best Results

Use curl -s https://api.example.com/data | pbcopy to copy an API response directly to clipboard on macOS.
For paginated APIs, format each page's response separately to inspect pagination metadata.
Check response headers alongside the body — Content-Type should be application/json, not text/html.

Frequently Asked Questions

How do I copy a raw API response from browser DevTools?

In Chrome: Network tab → click request → Response tab → right-click → Copy. Or use the Preview tab for a basic tree view, then paste the raw response here for full formatting with syntax highlighting.

Can I format responses from authenticated APIs?

Yes. Since all processing runs in your browser, your API tokens and authentication data never leave your device. This tool is safer than server-based formatters that transmit your data to their backend.