Cómo a Validar JSON

问题

You tener un JSON cadena de un untrusted o hand-edited source y necesitar a verificar it es syntactically correct.

Requisitos previos

• Understanding of JSON syntax
• Ability to read error messages

Pasos

1. 1. Parse the JSON string

   Attempt to parse the string as JSON. A standards-compliant parser will throw an error if the syntax is invalid. Common errors include trailing commas, single-quoted strings, and missing brackets.

   entrada

   {"name":"John",}

   输出

   Error: Unexpected token } at position 15

2. 2. Interpret the error location

   If parsing fails, the error message typically includes the position or line number of the problem. Go to that location in the input and fix the syntax issue. Repeat until parsing succeeds.

   entrada

   position 15

   输出

   trailing comma before }

3. 3. Optionally validate against a schema

   If you have a JSON Schema, validate the parsed JSON against it to check not just syntax but structure (required fields, types, value ranges). Schema validation catches semantic errors that syntax parsing cannot.

   entrada

   JSON + schema

   输出

   valid or schema errors

Resultado esperado

Confirmation ese el JSON es válido, o un limpiar error mensaje identifying el problem y its location.

Errores comunes

Trailing comma in object or array

JSON does not allow trailing commas. Remove the comma after the last element.

Single-quoted strings

JSON requires double quotes for strings and keys. Replace single quotes with double quotes.

Solución de problemas指引

• If the error position seems wrong, check for invisible characters like BOM or zero-width spaces.
• Use a JSON validator with line and column numbers for easier debugging.

Límites de seguridad

• Parsing untrusted JSON is generally safe, but do not use eval() to parse JSON — it can execute arbitrary code. Use JSON.parse instead.