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    Class FetchError

    Custom error class for HTTP error responses (non-2xx status codes).

    Thrown when Response.ok is false. Contains the HTTP status code for programmatic error handling.

    1.0.0

    import { fetchT, FetchError } from '@happy-ts/fetch-t';

    const result = await fetchT('https://api.example.com/not-found', {
        responseType: 'json',
    });

    result.inspectErr((err) => {
        if (err instanceof FetchError) {
            console.log('HTTP Status:', err.status);  // e.g., 404
            console.log('Status Text:', err.message); // e.g., "Not Found"

            // Handle specific status codes
            switch (err.status) {
                case 401:
                    console.log('Unauthorized - please login');
                    break;
                case 404:
                    console.log('Resource not found');
                    break;
                case 500:
                    console.log('Server error');
                    break;
            }
        }
    });

    Hierarchy

    • Error
      • FetchError
    Index

    Constructors

    constructor

    Properties

    cause? message name stack? status stackTraceLimit

    Methods

    captureStackTrace isError prepareStackTrace

    Constructors

    • Creates a new FetchError instance.

      Parameters

      • message: string

        The status text from the HTTP response (e.g., "Not Found").

      • status: number

        The HTTP status code (e.g., 404).

      Returns FetchError

    Properties

    cause?: unknown
    message: string
    name: string

    The error name, always 'FetchError'.

    stack?: string
    status: number

    The HTTP status code of the response (e.g., 404, 500).

    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.

    Methods

    • 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

    • Indicates whether the argument provided is a built-in Error instance or not.

      Parameters

      • error: unknown

      Returns error is Error

    • Parameters

      • err: Error
      • stackTraces: CallSite[]

      Returns any

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

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