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    Class UnsupportedFormEncodingError

    Raised when a request body is not a form encoding the framework can parse: a JSON body, a missing content-type, or a multipart/form-data type carrying no boundary=.

    Self-branded 415 Unsupported Media Type in its own constructor — the MalformedRequestBodyError precedent (X37-1) — so a body that is not a form is answered 415 in the application's configured format instead of the masked 500 an unbranded throw from body depth would produce. A handler that catches its own formData() rejection keeps full control of what is served; the class is exported so that catch can use instanceof.

    It is deliberately NOT thrown for a multipart body the parser cannot make sense of: that yields an empty FormBody, the promoted parser's released behaviour, documented on the accessor rather than converted into a status here.

    try {
      const form = await ctx.request.formData();
    } catch (error) {
      if (error instanceof UnsupportedFormEncodingError) {
        // Not a form body — answer 415 or read the body another way.
      }
    }

    0.6.0

    Hierarchy

    • Error
      • UnsupportedFormEncodingError
    Index
    constructor
    cause? message name stack? stackTraceLimit
    captureStackTrace prepareStackTrace
    cause?: unknown
    message: string
    name: "UnsupportedFormEncodingError" = 'UnsupportedFormEncodingError'

    Discriminant for consumers that cannot use instanceof across realms.

    stack?: string
    stackTraceLimit: number

    The Error.stackTraceLimit property specifies the number of stack frames collected by a stack trace (whether generated by new Error().stack or Error.captureStackTrace(obj)).

    The default value is 10 but may be set to any valid JavaScript number. Changes will affect any stack trace captured after the value has been changed.

    If set to a non-number value, or set to a negative number, stack traces will not capture any frames.

    • Creates a .stack property on targetObject, which when accessed returns a string representing the location in the code at which Error.captureStackTrace() was called.

      const myObject = {};
      Error.captureStackTrace(myObject);
      myObject.stack;  // Similar to `new Error().stack`

      The first line of the trace will be prefixed with ${myObject.name}: ${myObject.message}.

      The optional constructorOpt argument accepts a function. If given, all frames above constructorOpt, including constructorOpt, will be omitted from the generated stack trace.

      The constructorOpt argument is useful for hiding implementation details of error generation from the user. For instance:

      function a() {
        b();
      }

      function b() {
        c();
      }

      function c() {
        // Create an error without stack trace to avoid calculating the stack trace twice.
        const { stackTraceLimit } = Error;
        Error.stackTraceLimit = 0;
        const error = new Error();
        Error.stackTraceLimit = stackTraceLimit;

        // Capture the stack trace above function b
        Error.captureStackTrace(error, b); // Neither function c, nor b is included in the stack trace
        throw error;
      }

      a();

      Parameters

      • targetObject: object
      • OptionalconstructorOpt: Function

      Returns void

    • Parameters

      • err: Error
      • stackTraces: CallSite[]

      Returns any

      https://v8.dev/docs/stack-trace-api#customizing-stack-traces

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