Formateador y Validador de JSON

Embellece, formatea y valida tus datos JSON al instante. Nuestra herramienta gratuita en línea te ayuda a depurar JSON haciéndolo legible. 100% privado y se ejecuta en tu navegador.

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Format and validate JSON without uploading your data

Beautify, minify, and validate JSON instantly — right in your browser. No uploads, no sign-up, no limits.

100% privado
Instant formatting
Gratis para siempre

Como usarlo

  1. 1

    Pega Tu JSON

    Copia y pega tus datos JSON crudos y sin formato en el área de texto 'JSON de Entrada'.

  2. 2

    Formatea y Valida

    Haz clic en el botón 'Formatear / Validar'. La herramienta procesará los datos al instante.

  3. 3

    Revisa la Salida

    Si tu JSON es válido, aparecerá bellamente formateado. Si hay un error, se mostrará un mensaje de error detallado.

  4. 4

    Copia o Descarga

    Haz clic en 'Copiar Resultado' para copiar el JSON formateado o usa el botón de Descarga para guardarlo como un archivo .json.

Potente, Simple y Seguro

Formato Instantáneo

Transforma JSON desordenado de una sola línea en un formato bien indentado y legible para humanos con un solo clic.

Resaltado de Errores

Encuentra rápidamente errores de sintaxis. Nuestro validador señala exactamente qué está mal, ahorrándote un valioso tiempo de depuración.

100% Privado

Tus datos nunca salen de tu máquina. Todo el procesamiento ocurre localmente en tu navegador, garantizando una confidencialidad completa.

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Understanding JSON Formatting

What is JSON and why format it?

JSON (JavaScript Object Notation) is a lightweight data-interchange format that has become the de facto standard for APIs, configuration files, and data storage. It uses human-readable text to represent objects, arrays, numbers, strings, booleans, and null values. While JSON is designed to be easy for humans to read and write, many JSON payloads are transmitted in minified form (no whitespace) to save bandwidth, making them difficult to inspect.

A JSON formatter (also called a beautifier or pretty-printer) takes minified or poorly formatted JSON and adds consistent indentation, line breaks, and spacing so that the structure is immediately visible. For example, a single-line JSON string like `{"name":"John","address":{"city":"NYC","zip":"10001"}}` becomes a multi-line, indented structure where the nesting of objects and arrays is clear at a glance.

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Common JSON errors and how to fix them

JSON has a strict syntax defined by RFC 8259. The most common errors are: using single quotes instead of double quotes for strings, trailing commas after the last element in an array or object, unquoted property names, and unescaped special characters in strings. Our validator detects all of these and reports the exact line and column where the error occurs.

Another common issue is mixing JSON with JavaScript. JSON is not JavaScript — it does not support comments (// or /* */), it does not support single-quoted strings, and it does not support trailing commas. If your JSON works in JavaScript but fails in a strict parser, it's likely because it contains one of these JavaScript-specific extensions.

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¿Por Qué Formatear JSON?

Legibilidad

Comprende rápidamente la estructura de una respuesta de API o un archivo de configuración.

Depuración

Detecta fácilmente comas faltantes, corchetes no coincidentes u otros errores de sintaxis comunes.

Compartir

Comparte datos JSON con colegas en un formato limpio y profesional.

How does this compare to other JSON formatters?

A side-by-side comparison of popular JSON formatting tools.

CaracterísticaNovaToolsJSONFormatter.orgJSONLintVS Code
Privacidad (sin subida)100% localSube al servidorSube al servidorLocal
PrecioGratis ilimitadoGratis con anunciosGratis con anunciosFree
Registro requeridoNoNoNoN/A
Resaltado de erroresLine + columnOn save
Vista de árbol
Modo minimificar
Mobile friendlyLimitado
Funciona sin conexiónAfter page load

Online formatters like JSONFormatter.org and JSONLint upload your JSON to their servers. Our tool processes everything locally — your data never leaves your browser.

JSON Syntax Quick Reference

A quick guide to JSON data types and syntax rules.

Data Types

string

Texto entre comillas dobles. Las comillas simples no son válidas.

Ejemplo:"hello world"
number

Integer or floating point. No quotes needed.

Ejemplo:42 or 3.14
boolean

true or false (lowercase, no quotes).

Ejemplo:true
null

Represents absence of value (lowercase, no quotes).

Ejemplo:null
object

Key-value pairs wrapped in curly braces.

Ejemplo:{"key": "value"}
array

Ordered list wrapped in square brackets.

Ejemplo:[1, 2, 3]

Common Syntax Rules

"key":

Los nombres de propiedades deben ir entre comillas dobles.

Ejemplo:"name": "John"
,

Comma separates elements. No trailing comma allowed.

Ejemplo:[1, 2, 3] (not [1, 2, 3,])
\"

Escapa las comillas dobles dentro de cadenas con barra invertida.

Ejemplo:"He said \"hi\""
\\

Escapa la barra invertida con otra barra invertida.

Ejemplo:"C:\\Users"
\n

Newline character in strings.

Ejemplo:"Line1\nLine2"

Preguntas frecuentes

¿Están seguros mis datos con esta herramienta?
Sí, tus datos están 100% seguros. Esta herramienta realiza todo el formato y la validación directamente en tu navegador usando JavaScript. Tus datos JSON nunca se envían a nuestros servidores, garantizando una privacidad y seguridad completas.
¿Qué significa 'validar' JSON?
La validación es el proceso de verificar si tus datos JSON se adhieren a las reglas de sintaxis correctas. Esto incluye verificar cosas como llaves {} y corchetes [] que coincidan, y el uso correcto de comillas. Nuestra herramienta valida tu JSON automáticamente.
¿Puede esta herramienta manejar archivos JSON grandes?
Sí, la herramienta está diseñada para manejar archivos JSON grandes de manera eficiente. Como todo el procesamiento se realiza en tu máquina local, el rendimiento dependerá de la potencia de procesamiento y la memoria disponible de tu computadora.
¿Mis datos están seguros con esta herramienta?
Yes, your data is 100% safe. This tool performs all formatting and validation directly in your browser using JavaScript. Your JSON data is never sent to our servers, never stored in any database, and never logged. You can verify this by opening your browser's DevTools Network tab — no network requests are made when you format JSON. This makes the tool safe to use with API keys, credentials, customer data, and other sensitive information embedded in your JSON.
What does 'validating' JSON mean?
Validation is the process of checking if your JSON data adheres to the correct syntax rules defined by RFC 8259. This includes checking for matching curly braces {}, matching square brackets [], correct quoting of strings with double quotes (not single quotes), proper comma placement between elements, and ensuring that numbers, booleans, and null values are written correctly. Our tool validates your JSON automatically as you paste it and highlights the exact location of any syntax error.
Can this tool handle large JSON files?
Yes. The tool is designed to handle large JSON files efficiently using a streaming parser. Since all processing is done on your local machine, performance depends on your computer's processing power and available memory. Files up to 5-10 MB typically format instantly. For files larger than 50 MB, you may notice a brief delay (1-3 seconds) while the parser processes the data. Very large files (100+ MB) may cause the browser tab to become temporarily unresponsive.
What is the difference between JSON and JSONL?
JSON (JavaScript Object Notation) is a single data structure — either an object or an array — that represents the entire document. JSONL (JSON Lines) is a format where each line is a separate, independent JSON object, commonly used for log files and data pipelines. Our formatter expects standard JSON, not JSONL. If you paste JSONL, the validator will report an error because multiple top-level JSON values are not valid in a single JSON document.
¿Cómo arreglo los errores 'Unexpected token'?
This error occurs when the JSON parser encounters a character it does not expect. The most common causes are: (1) using single quotes instead of double quotes for strings, (2) trailing commas after the last element in an array or object, (3) unquoted property names, (4) comments (JSON does not support comments — use JSON5 or JSONC if you need them), and (5) special characters in strings that are not properly escaped. Our tool highlights the exact character position of the error so you can find and fix it quickly.
Can I minify JSON with this tool?
Yes. After formatting, you can click the 'Minify' button to compress the JSON back to a single line with no whitespace. This is useful for reducing the size of JSON payloads sent over the network. Minified JSON is typically 20-40% smaller than pretty-printed JSON because it removes all unnecessary whitespace, newlines, and indentation. The minified output is still valid JSON and can be re-formatted at any time.
Does this tool support JSON with comments (JSONC)?
No. Standard JSON (RFC 8259) does not support comments. If your JSON contains comments (lines starting with // or blocks wrapped in /* */), the validator will report a syntax error. JSONC and JSON5 are extended formats that do support comments, but they are not standard JSON. If you need to add notes to your JSON, consider using a separate documentation file or a format like YAML that natively supports comments.
How is this different from VS Code's JSON formatter?
VS Code's built-in formatter works great for local files but requires opening an editor and creating a file. Our tool is instant — paste your JSON and it's formatted immediately in any browser, with no installation, no file creation, and no setup. Our tool also provides explicit validation error messages with line and column numbers, which VS Code only shows on save. Additionally, our tool works on mobile devices where VS Code is not available.
¿Puedo usar esta herramienta para proyectos comerciales?
Yes. The tool is free for both personal and commercial use with no watermarks, no attribution required, and no usage limits. You retain full ownership of your data. There is no registration, no API key, and no subscription. The tool is particularly useful for QA teams, API developers, and data analysts who need to quickly inspect and validate JSON payloads.
¿Qué muestra la 'vista de árbol'?
The tree view renders your JSON as an expandable, collapsible hierarchy, allowing you to navigate nested objects and arrays visually. This is especially useful for large, deeply nested JSON structures where the raw text is hard to scan. You can click the expand/collapse arrows to show or hide sections, and the tree view highlights the path to the currently selected node, making it easy to understand the structure of complex API responses.

Su privacidad es nuestra prioridad

Esta herramienta se ejecuta completamente en su navegador. Sus archivos no se suben a un servidor, no se almacenan ni se analizan.

  • No subimos, almacenamos ni analizamos sus archivos.
  • Todo lo que procesa permanece en su dispositivo.
  • No hay procesamiento del lado del servidor, ni almacenamiento en la nube, ni análisis.

Incluso si su conexión a internet se cae, sus archivos permanecen seguros.

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