--- schema_version: "1" id: 9c5bfc31685e8f392bb765f0b0153ee5de3f419d6f6a2e61235a722bc50ad5c7 title: JSONGenerator Class collection: legacydeveloper version: current locale: en-us portal_url: https://docs.salesforce.com/legacydeveloper/current/en-us/apexref/apex_class_System_JsonGenerator.md canonical_url: https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm source_site: developer.salesforce.com content_type: documentation content_hash: a853e7624538264c3408e6e69d17429f1006cce831ace90253582fb9f9d414d1 description: Contains methods used to serialize objects into JSON content using the standard JSON encoding.Closes the JSON generator.Returns the generated JSON content.Returns true if the JSON generator is closed; otherwise, returns false.Writes the specified Blob value as a base64-encoded string.Writes a field name and value pair using the specified field name and BLOB value.Writes the specified Boolean value.Writes a field name and value pair using the specified field name and Boolean value.Writes the specified date value in the ISO-8601 format.Writes a field name and value pair using the specified field name and date value. The date value is written in the ISO-8601 format.Writes the specified date and time value in the ISO-8601 format.Writes a field name and value pair using the specified field name and date and time value. The date and time value is written in the ISO-8601 format.Writes the ending marker of a JSON array (']').Writes the ending marker of a JSON object ('}').Writes a field name.Writes the specified ID value.Writes a field name and value pair using the specified field name and identifier value.Writes the JSON null literal value.Writes a field name and value pair using the specified field name and the JSON null literal value.Writes the specified decimal value.Writes the specified double value.Writes the specified integer value.Writes the specified long value.Writes a field name and value pair using the specified field name and decimal value.Writes a field name and value pair using the specified field name and double value.Writes a field name and value pair using the specified field name and integer value.Writes a field name and value pair using the specified field name and long value.Writes the specified Apex object in JSON format.Writes a field name and value pair using the specified field name and Apex object.Writes the starting marker of a JSON array ('[').Writes the starting marker of a JSON object ('{').Writes the specified string value.Writes a field name and value pair using the specified field name and string value.Writes the specified time value in the ISO-8601 format.Writes a field name and value pair using the specified field name and time value in the ISO-8601 format. --- # JSONGenerator Class Contains methods used to serialize objects into JSON content using the standard JSON encoding. ## Namespace [System](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_namespace_System.htm "The System namespace provides classes and methods for core Apex functionality.") ## Usage The System.JSONGenerator class is provided to enable the generation of standard JSON-encoded content and gives you more control on the structure of the JSON output. #### See Also - [_Apex Developer Guide_: JSON Generator](https://developer.salesforce.com/docs/atlas.en-us.264.0.apexcode.meta/apexcode/apex_json_jsongenerator.htm "Apex Developer Guide: JSON Generator - HTML (New Window)") ## JSONGenerator Methods The following are methods for JSONGenerator. All are instance methods. - **[close()](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_close)** Closes the JSON generator. - **[getAsString()](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_getAsString)** Returns the generated JSON content. - **[isClosed()](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_isClosed)** Returns true if the JSON generator is closed; otherwise, returns false. - **[writeBlob(blobValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeBlob)** Writes the specified Blob value as a base64-encoded string. - **[writeBlobField(fieldName, blobValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeBlobField)** Writes a field name and value pair using the specified field name and BLOB value. - **[writeBoolean(blobValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeBoolean)** Writes the specified Boolean value. - **[writeBooleanField(fieldName, booleanValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeBooleanField)** Writes a field name and value pair using the specified field name and Boolean value. - **[writeDate(dateValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeDate)** Writes the specified date value in the ISO-8601 format. - **[writeDateField(fieldName, dateValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeDateField)** Writes a field name and value pair using the specified field name and date value. The date value is written in the ISO-8601 format. - **[writeDateTime(datetimeValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeDateTime)** Writes the specified date and time value in the ISO-8601 format. - **[writeDateTimeField(fieldName, datetimeValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeDateTimeField)** Writes a field name and value pair using the specified field name and date and time value. The date and time value is written in the ISO-8601 format. - **[writeEndArray()](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeEndArray)** Writes the ending marker of a JSON array ('\]'). - **[writeEndObject()](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeEndObject)** Writes the ending marker of a JSON object ('}'). - **[writeFieldName(fieldName)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeFieldName)** Writes a field name. - **[writeId(identifier)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeId)** Writes the specified ID value. - **[writeIdField(fieldName, identifier)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeIdField)** Writes a field name and value pair using the specified field name and identifier value. - **[writeNull()](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNull)** Writes the JSON null literal value. - **[writeNullField(fieldName)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNullField)** Writes a field name and value pair using the specified field name and the JSON null literal value. - **[writeNumber(number)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNumber)** Writes the specified decimal value. - **[writeNumber(number)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNumber_2)** Writes the specified double value. - **[writeNumber(number)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNumber_3)** Writes the specified integer value. - **[writeNumber(number)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNumber_4)** Writes the specified long value. - **[writeNumberField(fieldName, number)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNumberField)** Writes a field name and value pair using the specified field name and decimal value. - **[writeNumberField(fieldName, number)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNumberField_2)** Writes a field name and value pair using the specified field name and double value. - **[writeNumberField(fieldName, number)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNumberField_3)** Writes a field name and value pair using the specified field name and integer value. - **[writeNumberField(fieldName, number)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeNumberField_4)** Writes a field name and value pair using the specified field name and long value. - **[writeObject(anyObject)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeObject)** Writes the specified Apex object in JSON format. - **[writeObjectField(fieldName, value)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeObjectField)** Writes a field name and value pair using the specified field name and Apex object. - **[writeStartArray()](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeStartArray)** Writes the starting marker of a JSON array ('\['). - **[writeStartObject()](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeStartObject)** Writes the starting marker of a JSON object ('{'). - **[writeString(stringValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeString)** Writes the specified string value. - **[writeStringField(fieldName, stringValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeStringField)** Writes a field name and value pair using the specified field name and string value. - **[writeTime(timeValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeTime)** Writes the specified time value in the ISO-8601 format. - **[writeTimeField(fieldName, timeValue)](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_System_JsonGenerator.htm#apex_System_JsonGenerator_writeTimeField)** Writes a field name and value pair using the specified field name and time value in the ISO-8601 format. ### close() Closes the JSON generator. #### Signature public Void close() #### Return Value Type: Void #### Usage No more content can be written after the JSON generator is closed. ### getAsString() Returns the generated JSON content. #### Signature public String getAsString() #### Return Value Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") #### Usage This method closes the JSON generator if it isn't closed already. ### isClosed() Returns true if the JSON generator is closed; otherwise, returns false. #### Signature public Boolean isClosed() #### Return Value Type: [Boolean](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_boolean.htm#apex_methods_system_boolean "Contains methods for the Boolean primitive data type.") ### writeBlob(blobValue) Writes the specified Blob value as a base64-encoded string. #### Signature public Void writeBlob(Blob blobValue) #### Parameters - **blobValue**: Type: [Blob](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_blob.htm#apex_methods_system_blob "Contains methods for the Blob primitive data type.") #### Return Value Type: Void ### writeBlobField(fieldName, blobValue) Writes a field name and value pair using the specified field name and BLOB value. #### Signature public Void writeBlobField(String fieldName, Blob blobValue) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **blobValue**: Type: [Blob](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_blob.htm#apex_methods_system_blob "Contains methods for the Blob primitive data type.") #### Return Value Type: Void ### writeBoolean(blobValue) Writes the specified Boolean value. #### Signature public Void writeBoolean(Boolean blobValue) #### Parameters - **blobValue**: Type: [Boolean](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_boolean.htm#apex_methods_system_boolean "Contains methods for the Boolean primitive data type.") #### Return Value Type: Void ### writeBooleanField(fieldName, booleanValue) Writes a field name and value pair using the specified field name and Boolean value. #### Signature public Void writeBooleanField(String fieldName, Boolean booleanValue) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **booleanValue**: Type: [Boolean](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_boolean.htm#apex_methods_system_boolean "Contains methods for the Boolean primitive data type.") #### Return Value Type: Void ### writeDate(dateValue) Writes the specified date value in the ISO-8601 format. #### Signature public Void writeDate(Date dateValue) #### Parameters - **dateValue**: Type: [Date](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_date.htm#apex_methods_system_date "Contains methods for the Date primitive data type.") #### Return Value Type: Void ### writeDateField(fieldName, dateValue) Writes a field name and value pair using the specified field name and date value. The date value is written in the ISO-8601 format. #### Signature public Void writeDateField(String fieldName, Date dateValue) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **dateValue**: Type: [Date](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_date.htm#apex_methods_system_date "Contains methods for the Date primitive data type.") #### Return Value Type: Void ### writeDateTime(datetimeValue) Writes the specified date and time value in the ISO-8601 format. #### Signature public Void writeDateTime(Datetime datetimeValue) #### Parameters - **datetimeValue**: Type: [Datetime](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_datetime.htm#apex_methods_system_datetime "Contains methods for the Datetime primitive data type.") #### Return Value Type: Void ### writeDateTimeField(fieldName, datetimeValue) Writes a field name and value pair using the specified field name and date and time value. The date and time value is written in the ISO-8601 format. #### Signature public Void writeDateTimeField(String fieldName, Datetime datetimeValue) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **datetimeValue**: Type: [Datetime](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_datetime.htm#apex_methods_system_datetime "Contains methods for the Datetime primitive data type.") #### Return Value Type: Void ### writeEndArray() Writes the ending marker of a JSON array ('\]'). #### Signature public Void writeEndArray() #### Return Value Type: Void ### writeEndObject() Writes the ending marker of a JSON object ('}'). #### Signature public Void writeEndObject() #### Return Value Type: Void ### writeFieldName(fieldName) Writes a field name. #### Signature public Void writeFieldName(String fieldName) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") #### Return Value Type: Void ### writeId(identifier) Writes the specified ID value. #### Signature public Void writeId(ID identifier) #### Parameters - **identifier**: Type: [ID](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_id.htm#apex_methods_system_id "Contains methods for the ID primitive data type.") #### Return Value Type: Void ### writeIdField(fieldName, identifier) Writes a field name and value pair using the specified field name and identifier value. #### Signature public Void writeIdField(String fieldName, Id identifier) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **identifier**: Type: [ID](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_id.htm#apex_methods_system_id "Contains methods for the ID primitive data type.") #### Return Value Type: Void ### writeNull() Writes the JSON null literal value. #### Signature public Void writeNull() #### Return Value Type: Void ### writeNullField(fieldName) Writes a field name and value pair using the specified field name and the JSON null literal value. #### Signature public Void writeNullField(String fieldName) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") #### Return Value Type: Void ### writeNumber(number) Writes the specified decimal value. #### Signature public Void writeNumber(Decimal number) #### Parameters - **number**: Type: [Decimal](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_decimal.htm#apex_methods_system_decimal "Contains methods for the Decimal primitive data type.") #### Return Value Type: Void ### writeNumber(number) Writes the specified double value. #### Signature public Void writeNumber(Double number) #### Parameters - **number**: Type: [Double](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_double.htm#apex_methods_system_double "Contains methods for the Double primitive data type.") #### Return Value Type: Void ### writeNumber(number) Writes the specified integer value. #### Signature public Void writeNumber(Integer number) #### Parameters - **number**: Type: [Integer](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_integer.htm#apex_methods_system_integer "Contains methods for the Integer primitive data type.") #### Return Value Type: Void ### writeNumber(number) Writes the specified long value. #### Signature public Void writeNumber(Long number) #### Parameters - **number**: Type: [Long](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_long.htm#apex_methods_system_long "Contains methods for the Long primitive data type.") #### Return Value Type: Void ### writeNumberField(fieldName, number) Writes a field name and value pair using the specified field name and decimal value. #### Signature public Void writeNumberField(String fieldName, Decimal number) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **number**: Type: [Decimal](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_decimal.htm#apex_methods_system_decimal "Contains methods for the Decimal primitive data type.") #### Return Value Type: Void ### writeNumberField(fieldName, number) Writes a field name and value pair using the specified field name and double value. #### Signature public Void writeNumberField(String fieldName, Double number) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **number**: Type: [Double](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_double.htm#apex_methods_system_double "Contains methods for the Double primitive data type.") #### Return Value Type: Void ### writeNumberField(fieldName, number) Writes a field name and value pair using the specified field name and integer value. #### Signature public Void writeNumberField(String fieldName, Integer number) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **number**: Type: [Integer](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_integer.htm#apex_methods_system_integer "Contains methods for the Integer primitive data type.") #### Return Value Type: Void ### writeNumberField(fieldName, number) Writes a field name and value pair using the specified field name and long value. #### Signature public Void writeNumberField(String fieldName, Long number) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **number**: Type: [Long](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_long.htm#apex_methods_system_long "Contains methods for the Long primitive data type.") #### Return Value Type: Void ### writeObject(anyObject) Writes the specified Apex object in JSON format. #### Signature public Void writeObject(Object anyObject) #### Parameters - **anyObject**: Type: Object #### Return Value Type: Void ### writeObjectField(fieldName, value) Writes a field name and value pair using the specified field name and Apex object. #### Signature public Void writeObjectField(String fieldName, Object value) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **value**: Type: Object #### Return Value Type: Void ### writeStartArray() Writes the starting marker of a JSON array ('\['). #### Signature public Void writeStartArray() #### Return Value Type: Void ### writeStartObject() Writes the starting marker of a JSON object ('{'). #### Signature public Void writeStartObject() #### Return Value Type: Void ### writeString(stringValue) Writes the specified string value. #### Signature public Void writeString(String stringValue) #### Parameters - **stringValue**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") #### Return Value Type: Void ### writeStringField(fieldName, stringValue) Writes a field name and value pair using the specified field name and string value. #### Signature public Void writeStringField(String fieldName, String stringValue) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **stringValue**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") #### Return Value Type: Void ### writeTime(timeValue) Writes the specified time value in the ISO-8601 format. #### Signature public Void writeTime(Time timeValue) #### Parameters - **timeValue**: Type: [Time](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_time.htm#apex_methods_system_time "Contains methods for the Time primitive data type.") #### Return Value Type: Void ### writeTimeField(fieldName, timeValue) Writes a field name and value pair using the specified field name and time value in the ISO-8601 format. #### Signature public Void writeTimeField(String fieldName, Time timeValue) #### Parameters - **fieldName**: Type: [String](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_string.htm#apex_methods_system_string "Contains methods for the String primitive data type.") - **timeValue**: Type: [Time](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_time.htm#apex_methods_system_time "Contains methods for the Time primitive data type.") #### Return Value Type: Void