Description
Validate the number token and inspect exponent presence, its minus sign, and whether every exponent digit is zero.
A JSON number's grammar, decimal spelling, and parsed binary value are different layers. Exponents, leading zeros, and negative zero can carry lexical information lost during numeric conversion.
Validate the number token and inspect exponent presence, its minus sign, and whether every exponent digit is zero.
When to use this tool
Use JSON Number Exponent Negative Zero Label when you need a numeric token's spelling or serialization convention.
How to use the tool and how it works
- Enter token. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read exponentPresent, exponentNegative, exponentZero, negativeExponentZero. Inspect exponentPresent, exponentNegative, exponentZero, negativeExponentZero before interpreting the associated values.
Validate the number token and inspect exponent presence, its minus sign, and whether every exponent digit is zero. Mark negativeExponentZero when both sign and zero conditions hold.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| token | Token | Required. Text; maximum UTF-16 length 8192. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| exponentPresent | Exponent Present | Required. Boolean. |
| exponentNegative | Exponent Negative | Required. Boolean. |
| exponentZero | Exponent Zero | Required. Boolean. |
| negativeExponentZero | Negative Exponent Zero | Required. Boolean. |
{
"input": {
"token": "1.2e-00"
},
"output": {
"exponentPresent": true,
"exponentNegative": true,
"exponentZero": true,
"negativeExponentZero": true
}
}Limitations and assumptions
- These are lexical flags independent of coefficient sign or numeric negative zero.
- 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 an exact decimal parser when preserving large integers, decimal scale, or lexical round trips is required.
References
Similar or alternative tools
- JSON: JSON Number Negative Zero Lexeme
Validate JSON number grammar.
- JSON Number Exponent Sign Normalizer
Validate JSON number grammar, then lowercase the exponent marker, remove an exponent plus sign, and strip redundant exponent leading zeros.