tezx/middleware/pagination.js

TezX is a high-performance, lightweight JavaScript framework designed for speed, scalability, and flexibility. It enables efficient routing, middleware management, and static file serving with minimal configuration. Fully compatible with Node.js, Deno, an

export const paginationHandler = (options = {}) => {
    const { defaultPage = 1, defaultLimit = 10, maxLimit = 100, queryKeyPage = "page", queryKeyLimit = "limit", countKey = "total", dataKey = "data", getDataSource, } = options;
    return async function paginationHandler(ctx, next) {
        const rawPage = ctx.req.query[queryKeyPage];
        const rawLimit = ctx.req.query[queryKeyLimit];
        const page = Math.max(parseInt(rawPage || `${defaultPage}`, 10), 1);
        const limit = Math.min(Math.max(parseInt(rawLimit || `${defaultLimit}`, 10), 1), maxLimit);
        const offset = (page - 1) * limit;
        ctx.pagination = {
            page,
            limit,
            offset,
            queryKeyPage,
            queryKeyLimit,
        };
        if (getDataSource) {
            const dataSourceResponse = await getDataSource(ctx, {
                page,
                limit,
                offset,
            });
            const total = dataSourceResponse?.[countKey];
            const data = dataSourceResponse?.[dataKey];
            const pagination = {
                page,
                limit,
                offset,
                totalItems: total,
                totalPages: Math.ceil(total / limit),
                hasNextPage: page < Math.ceil(total / limit),
                hasPrevPage: page > 1,
                nextPage: page < Math.ceil(total / limit) ? page + 1 : null,
                prevPage: page > 1 ? page - 1 : null,
            };
            ctx.pagination = pagination;
            const body = {
                [dataKey]: data,
                [countKey]: total,
                pagination,
            };
            ctx.body = body;
            if (next) {
                return await next();
            }
            return ctx.json(body);
        }
        return await next();
    };
};