express-query-defaults

npm install express-query-defaults --save

Usage

const defaults = require('express-query-defaults')

app.get(
  '/posts',
  defaults({
    limit: { type: 'number', default: 30 }, // parse limit as number with default 30
    offset: { type: 'number', default: 0 }, // parse offset as number with default 0
    tags: { type: 'array', default: [] },   // parse coma-separated string as array
    sort: { // sort: "asc" and "1" for 1, everything else if -1
      type: 'string',
      default: v => [ 'asc', '1' ].includes((v || '').toLowerCase()) ? 1 : -1
    }
  }),
  (req, res, next) => {
    const { limit, offset, sort, tags } = req.query

    Post
      .find()
      .where({ tags: { $all: tags } })
      .skip(offset)
      .limit(limit)
      .sort({ createdAt: sort })
      .exec((err, posts) => {
        res.json(posts)
      })
  }
)