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How-To Guide

Format, Validate, and Diff JSON API Responses

Prettify minified API responses and config files for easy reading, catch syntax errors with instant validation, and visually compare two JSON payloads with the diff tool — no installation, no setup.

No Cloud — Fully In-Browser

  • ✓All processing happens in browser memory. Your files are never sent to any external server.
  • ✓Safe for files containing sensitive or personal information.
  • ✓No account needed. Free and ready to use instantly.

2 Steps to Get It Done

Click any tool name below to go directly to that tool.

  1. 1
    JSON Formatter

    Prettify minified JSON with indentation for readability. Syntax errors are flagged immediately during formatting

  2. 2
    Text Diff

    Compare two JSON texts side-by-side and visually identify added, changed, and removed fields

Frequently Asked Questions

Does it validate against a JSON schema?
Only JSON syntax validation is currently supported. Schema validation (types, required fields) is not available.
Does it work with large JSON files?
Processing happens in your browser, so very large files (tens of MB or more) may be slow. Typical API responses and config files (a few MB or less) work without issue.

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