very-simple-schema

Bundle size: ~22.5 kB, ~5.5 kB gzipped

Like SimpleSchema but even simpler

This package implements an essential subset of SimpleSchema. Unlike the original version it does not provide validation of Mongo selectors, nor does it allow you to define default and auto values. Despite the limited functionality it may still be an interesting alternative for solving problems like:

• form validation - it integrates nicely with redux-form
• function parameters validation, e.g. in remote api calls

Instllation

npm install --save very-simple-schema

Basic usage

import { Schema } from 'very-simple-schema';

const Book = new Schema({
  author:    { type: String, nonEmpty: true }, // must be present and non-empty
  title:     { type: String, optional: true, nonEmpty: true }, // can be missing, but if present then must be non-empty
  abstract:  { type: String, optional: true }, // can be missing
  signature: { type: String }, // must be present, if present can be empty
});

Gotchas

Unlkie in SimpleSchema, empty strings are accepted even if a property is required. The reason SimpleSchema treats them differently is that clean method is being called on an object before it's validated. To emulate the original behavior you can create a custom Schema class with different default behavior:

import { createSchema, presetDefault } from 'very-simple-schema';

const Schema = createSchema({
  plugins: [
    ...presetDefault,
  ],
  emptyStringsAreMissingValues: true,
});

Examples

import { Schema } from 'very-simple-schema';

// a number between 0 and 10
new Schema(Number, { min: 0, max: 10 });

// array with at least element
Schema.arrayOf(Schema.any(), { minCount: 1 });

// object that contains anything
Schema.blackbox();
Schema.objectOf(Schema.any());

// either Yes or No
Schema.enum(['Yes', 'No']);

// can be one of the specified types
const Id = Schema.oneOf([String, Number]);

const User = new Schema({
  name: { type: String },
  email: { type: String, regEx: Schema.RegEx.Email, optional: true },
}, {
  // custom typeName can improve some error messages
  typeName: 'User',
});

const Book = new Schema({
  id: { type: Id },
  // type can reference another schema
  author: { type: User },
  // strings can be requested to be non empty
  title: { type: String, nonEmpty: true },
  abstract: { type: String },
  // array can be constructed with [] shortcut, maxCount refers to array lenght, max refers to string length
  chapters: { type: [String], '$.max': 128, maxCount: 10 },
}, { typeName: 'Book' });

const Library = new Schema({
  books: { type: [Book], maxCount: 1000 },
}, {
  typeName: 'Library',
});