inicio/dev/json-formatter

JSON Formatter & Beautifier Online

Beautify & pretty-print JSON with configurable indentation

Did you know?

Valid JSON keys must be double-quoted. Standard single quotes or no quotes around keys will cause a parse error in most strict environments.

Cómo usar JSON Formatter

  1. 1

    Paste your JSON

    Enter or paste raw or minified JSON into the editor.

  2. 2

    Choose indentation

    Select 2 spaces, 4 spaces, or tab from the dropdown.

  3. 3

    Click Format

    Your JSON is instantly pretty-printed in the output panel.

Preguntas frecuentes

Is my data safe?
Yes. All processing happens entirely in your browser. Your data never leaves your device and is never uploaded to any server.
What is the difference between formatting and validating JSON?
Formatting adds whitespace and indentation to make JSON readable. Validating checks whether the JSON syntax is correct according to the RFC 8259 specification. Use the JSON Validator to check for syntax errors.
Can it handle large JSON files?
Yes. The formatter processes JSON of any size directly in your browser. Files up to 10 MB format instantly on most devices.
What indentation style does it use by default?
2-space indentation by default, which is the most common style in web development. You can change it to 4 spaces or tabs.

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¿Qué es JSON Formatter?

Format and beautify JSON data instantly with configurable indentation. Paste messy, minified, or unreadable JSON and get clean, indented output in one click. Supports 2-space, 4-space, and tab indentation. Perfect for debugging API responses, editing config files, and preparing JSON for documentation. Everything runs in your browser — your data is never sent to any server.

¿Por qué usar JSON Formatter?

  • Instant formatting — paste unreadable JSON and get clean, indented output in one click.
  • Configurable indentation — choose 2 spaces, 4 spaces, or tabs to match your code style.
  • Syntax error detection — invalid JSON is caught immediately with a clear error message.
  • Client-side processing — your JSON (API keys, tokens, config data) never leaves your browser.
  • No installation — works immediately in any browser without plugins or extensions.

Casos de uso de JSON Formatter

API response debugging

Paste raw API responses to make them readable. Quickly find specific fields in deeply nested JSON structures.

Config file editing

Format package.json, tsconfig.json, or other config files for easier editing.

Documentation

Format JSON examples for README files, tutorials, or API docs with consistent indentation.

Code review

Beautify minified JSON payloads to understand structure during pull request reviews.

Consejos y buenas prácticas

  • 💡Use 2-space indentation for web projects — it's the most common style and produces smaller formatted files.
  • 💡After formatting, pair with the JSON Validator to confirm there are no hidden syntax errors.
  • 💡Pair this tool with the YAML-JSON converter to switch between configuration formats.
  • 💡For very large JSON files, format a portion at a time if your browser becomes slow.

Cómo funciona

The formatter uses JavaScript's built-in JSON.parse() and JSON.stringify() with configurable indentation. This ensures 100% compatibility with the JSON specification (RFC 8259). Error messages come directly from the browser's JSON parser.

Más información

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