nextjs-parser

NextJS page props, especially UrlSearchParams parser utility in NextJS v13 app routing.

In NextJS v13 app routing, Page can get params, searchParams from url. But searchParams is not URLSearchParams, it is just plain object. So this library parse it to schema and make url navigation easy.

Also supports number/boolean parsing of FormData used in server action.

Installation

npm install nextjs-parser

Example

Pagination like /posts?page=1 can be parsed like this.

paginationParams.ts

import { NextProps, NextSearchParams } from '../NextProps';

export interface PaginationParams {
  page: number;
}

export namespace PaginationParams {
  const schema = {
    page: 'number',
  } as const;

  export const defaultValue: PaginationParams = {
    page: 1,
  };

  export const parse = (props: NextProps): PaginationParams => {
    return NextSearchParams.parse(props.searchParams, schema, defaultValue);
  };

  export const merge = (searchParams: NextSearchParams, params: Partial<PaginationParams>): string => {
    return NextSearchParams.merge(searchParams, params);
  }
}

page.tsx

export default async function ListPage(props: NextProps) {
  const { page } = PaginationParams.parse(props);

  return (
    <Link href={`/page?${
      PaginationParams.merge(props.searchParams, {
        page: page + 1,
      })
    }`}>
      next page
    </Link>
  )
  // ...
}

Nullable

paginationParams.ts

import { NextProps, NextSearchParams } from '../NextProps';

export interface CreatePaginationParams {
  create: boolean | null;
  page: number;
}

export namespace CreatePaginationParams {
  const schema = {
    create: 'boolean?',
    page: 'number',
  } as const;

  export const defaultValue: CreatePaginationParams = {
    create: null,
    page: 1,
  };

  export const parse = (props: NextProps): CreatePaginationParams => {
    return NextSearchParams.parse(props.searchParams, schema, defaultValue);
  };

  export const merge = (searchParams: NextSearchParams, params: Partial<CreatePaginationParams>): string => {
    return NextSearchParams.merge(searchParams, params);
  }
}

page.tsx

export default async function ListPage(props: NextProps) {
  const { create, page } = CreatePaginationParams.parse(props);

  if (create) {
    // ...
  }

  return (
    <Link href={`/page?${
      CreatePaginationParams.merge(props.searchParams, {
        page: page + 1,
      })
    }`}>
      next page
    </Link>
  )
  // ...
}