@middy/http-error-handler/index.js

Http error handler middleware for the middy framework

import { jsonSafeParse, normalizeHttpResponse } from '@middy/util';
const defaults = {
    logger: console.error,
    fallbackMessage: null
};
const httpErrorHandlerMiddleware = (opts = {})=>{
    const options = {
        ...defaults,
        ...opts
    };
    const httpErrorHandlerMiddlewareOnError = async (request)=>{
        if (request.response !== undefined) return;
        if (typeof options.logger === 'function') {
            options.logger(request.error);
        }
        if (request.error.statusCode && request.error.expose === undefined) {
            request.error.expose = request.error.statusCode < 500;
        }
        if (options.fallbackMessage && (!request.error.statusCode || !request.error.expose)) {
            request.error = {
                statusCode: 500,
                message: options.fallbackMessage,
                expose: true
            };
        }
        if (request.error.expose) {
            normalizeHttpResponse(request);
            const { statusCode , message  } = request.error;
            request.response = {
                ...request.response,
                statusCode: statusCode,
                body: message,
                headers: {
                    ...request.response.headers,
                    'Content-Type': typeof jsonSafeParse(message) === 'string' ? 'text/plain' : 'application/json'
                }
            };
        }
    };
    return {
        onError: httpErrorHandlerMiddlewareOnError
    };
};
export default httpErrorHandlerMiddleware;


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