java.lang.Object
- java.lang.Enum<JsonWriteFeature>
- - com.fasterxml.jackson.core.json.JsonWriteFeature

All Implemented Interfaces:

FormatFeature, JacksonFeature, java.io.Serializable, java.lang.Comparable<JsonWriteFeature>
```
public enum JsonWriteFeature
extends java.lang.Enum<JsonWriteFeature>
implements FormatFeature
```
Token writer features specific to JSON backend.

Since:

2.10

Enum Constant Summary

Enum Constants
Enum Constant	Description
`ESCAPE_NON_ASCII`	Feature that specifies that all characters beyond 7-bit ASCII range (i.e.
`QUOTE_FIELD_NAMES`	Feature that determines whether JSON Object field names are quoted using double-quotes, as specified by JSON specification or not.
`WRITE_NAN_AS_STRINGS`	Feature that determines whether "NaN" ("not a number", that is, not real number) float/double values are output as JSON strings.
`WRITE_NUMBERS_AS_STRINGS`	Feature that forces all regular number values to be written as JSON Strings, instead of as JSON Numbers.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static int`	`collectDefaults()`	Method that calculates bit set (flags) of all features that are enabled by default.
`boolean`	`enabledByDefault()`	Accessor for checking whether this feature is enabled by default.
`boolean`	`enabledIn(int flags)`	Convenience method for checking whether feature is enabled in given bitmask
`int`	`getMask()`	Returns bit mask for this feature instance; must be a single bit, that is of form `(1 << N)`
`JsonGenerator.Feature`	`mappedFeature()`
`static JsonWriteFeature`	`valueOf(java.lang.String name)`	Returns the enum constant of this type with the specified name.
`static JsonWriteFeature[]`	`values()`	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - QUOTE_FIELD_NAMES
```
public static final JsonWriteFeature QUOTE_FIELD_NAMES
```
    Feature that determines whether JSON Object field names are quoted using double-quotes, as specified by JSON specification or not. Ability to disable quoting was added to support use cases where they are not usually expected, which most commonly occurs when used straight from Javascript.
    Feature is enabled by default (since it is required by JSON specification).
  - WRITE_NAN_AS_STRINGS
```
public static final JsonWriteFeature WRITE_NAN_AS_STRINGS
```
    Feature that determines whether "NaN" ("not a number", that is, not real number) float/double values are output as JSON strings. The values checked are Double.Nan, Double.POSITIVE_INFINITY and Double.NEGATIVE_INIFINTY (and associated Float values). If feature is disabled, these numbers are still output using associated literal values, resulting in non-conforming output.
    Feature is enabled by default.
  - WRITE_NUMBERS_AS_STRINGS
```
public static final JsonWriteFeature WRITE_NUMBERS_AS_STRINGS
```
    Feature that forces all regular number values to be written as JSON Strings, instead of as JSON Numbers. Default state is 'false', meaning that Java numbers are to be serialized using basic numeric representation but if enabled all such numeric values are instead written out as JSON Strings instead.
    One use case is to avoid problems with Javascript limitations: since Javascript standard specifies that all number handling should be done using 64-bit IEEE 754 floating point values, result being that some 64-bit integer values can not be accurately represent (as mantissa is only 51 bit wide).
    Feature is disabled by default.
  - ESCAPE_NON_ASCII
```
public static final JsonWriteFeature ESCAPE_NON_ASCII
```
    Feature that specifies that all characters beyond 7-bit ASCII range (i.e. code points of 128 and above) need to be output using format-specific escapes (for JSON, backslash escapes), if format uses escaping mechanisms (which is generally true for textual formats but not for binary formats).
    Feature is disabled by default.
- Method Detail
  - values
```
public static JsonWriteFeature[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
    for (JsonWriteFeature c : JsonWriteFeature.values()) System.out.println(c);
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static JsonWriteFeature valueOf(java.lang.String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
    
    java.lang.NullPointerException - if the argument is null
  - collectDefaults
```
public static int collectDefaults()
```
    Method that calculates bit set (flags) of all features that are enabled by default.
    
    Returns:
    
    Bit mask of all features that are enabled by default
  - enabledByDefault
```
public boolean enabledByDefault()
```
    Description copied from interface: FormatFeature
    
    Accessor for checking whether this feature is enabled by default.
    
    Specified by:
    
    enabledByDefault in interface FormatFeature
    
    Specified by:
    
    enabledByDefault in interface JacksonFeature
    
    Returns:
    
    Whether this instance is enabled by default or not
  - getMask
```
public int getMask()
```
    Description copied from interface: FormatFeature
    
    Returns bit mask for this feature instance; must be a single bit, that is of form (1 << N)
    
    Specified by:
    
    getMask in interface FormatFeature
    
    Specified by:
    
    getMask in interface JacksonFeature
    
    Returns:
    
    Bit mask of this feature
  - enabledIn
```
public boolean enabledIn(int flags)
```
    Description copied from interface: FormatFeature
    
    Convenience method for checking whether feature is enabled in given bitmask
    
    Specified by:
    
    enabledIn in interface FormatFeature
    
    Specified by:
    
    enabledIn in interface JacksonFeature
    
    Parameters:
    
    flags - Bit field that contains a set of enabled features of this type
    
    Returns:
    
    True if this feature is enabled in passed bit field
  - mappedFeature
```
public JsonGenerator.Feature mappedFeature()
```

Enum JsonWriteFeature

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

QUOTE_FIELD_NAMES

WRITE_NAN_AS_STRINGS

WRITE_NUMBERS_AS_STRINGS

ESCAPE_NON_ASCII

Method Detail

values

valueOf

collectDefaults

enabledByDefault

getMask

enabledIn

mappedFeature