Formatter
A formatter is a software component that converts or structures data, records, or messages according to a specified representation format.
ASP.NET Core in Action, 3e
A formatter is an ASP.NET Core component that serializes or deserializes HTTP content in a particular representation format.
- How it is used
- Serializes API models into HTTP responses that clients can consume.
- How deep it goes
- Explains default format selection, negotiation exceptions, and configuration; does not implement a custom formatter.
- Examples
- Uses a car-list controller, an XML request that falls back to JSON, and configuration for XML and browser Accept headers.
- What you can do after
- Operate/configure it with `AddXmlSerializerFormatters()`, `AddNewtonsoftJson()`, or controller options to change supported formats and negotiation behavior.
Troubleshooting Java, Second Edition
A formatter is a logging component that determines the textual structure of log messages.
- How it is used
- Shapes log messages before appenders write them to destinations such as the console, files, or databases.
- How deep it goes
- Defines the formatter’s role and demonstrates a PatternLayout, but does not detail pattern syntax beyond configured fields.
- Examples
- Uses a Console appender, PatternLayout configuration, and formatted StringDigitExtractor output.
- What you can do after
- Configure it via Log4j’s PatternLayout to attach consistent metadata before writing messages.
Read how Troubleshooting Java, Second Edition explains Formatter →
Related concepts
- f-stringcontrasts with · An f-string is a Python formatted string literal that evaluates embedded expressions and inserts their formatted values into the resulting string.
- monitoringconfigures · Monitoring is the ongoing observation and measurement of a system’s behavior, state, or operational signals to assess its condition and detect changes or problems.
- xmlproduces · XML is a text-based markup language for encoding structured documents and data using elements, attributes, and nested relationships.
- api modeluses · An API-accessible model is a machine-learning model whose capabilities are made available to software through an application programming interface.
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