JSON Array Singleton Unwrapper Tool

Description

Parse json as an array, require exactly one element, and serialize that element into valueJson.

JSON distinguishes null, strings, numbers, Booleans, arrays, and objects. Parsing a token produces a value whose type can differ from its apparent textual spelling.

Parse json as an array, require exactly one element, and serialize that element into valueJson.

When to use this tool

Use JSON Array Singleton Unwrapper when you need one bounded JSON value classification or wrapper operation.

How to use the tool and how it works

Enter json. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read valueJson. Use the output convention below.

Parse json as an array, require exactly one element, and serialize that element into valueJson.^[1]

Input field	Meaning and units	Accepted input
json	Json	Required. Text; maximum UTF-16 length 8192.

Output field	Interpretation	Returned shape
valueJson	Value Json	Required. Text; maximum UTF-16 length 8192.

json

{
  "input": {
    "json": "[\"a\"]"
  },
  "output": {
    "valueJson": "\"a\""
  }
}

Limitations and assumptions

This removes one array wrapper only; nested content is retained and empty or longer arrays are rejected.
Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.

Alternative or Complementary methods

Use a full document parser and the consuming schema when complete validation or exact numeric preservation is required.

References

Calculation and input contract: json/json-array-singleton-unwrapper — tool.io

Similar or alternative tools

JSON Array Null Tail Cardinality
Parse json as an array and scan backward while elements are literal null.
JSON Object Single Member Wrapper
Parse valueJson and wrap it under the literal key using a computed object property.