ajv VS Yup

Compare ajv vs Yup and see what are their differences.

ajv

The fastest JSON schema Validator. Supports JSON Schema draft-04/06/07/2019-09/2020-12 and JSON Type Definition (RFC8927) (by ajv-validator)

Yup

Dead simple Object schema validation (by jquense)
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ajv Yup
59 111
13,261 22,080
1.2% -
6.0 7.1
8 days ago 8 days ago
TypeScript TypeScript
MIT License MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

ajv

Posts with mentions or reviews of ajv. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-10-03.
  • 6 Reasons why JSON Schema is worth your time
    5 projects | dev.to | 3 Oct 2023
    In the JavaScript ecosystem you can use the excellent AJV package to validate any JavaScript object against a JSON schema. This is especially useful to ensure that API contracts are maintained when communicating with other services.
  • Migrate Your Express Application to Fastify
    12 projects | dev.to | 5 Jul 2023
    Since Fastify supports schema validation with Ajv, the validate module is no longer required on the /shorten route, and we can specify the JSON schema directly on the route. The controllers for both routes will largely remain the same, except that the res parameter is renamed to reply as before:
  • Has anybody used Typia library?
    3 projects | /r/typescript | 27 Jun 2023
    There's a ton of schema validators out there and most devs have their personal favorite. Mine was zod and is now typebox + ajv.
  • Advanced Fastify: Hooks, Middleware, and Decorators
    4 projects | dev.to | 31 May 2023
    Fastify uses JSON schema to define the validation rules for each route's input payload, which includes the request body, query string, parameters, and headers. The JSON schema is a standard format for defining the structure and constraints of JSON data, and Fastify uses Ajv, one of the fastest and most efficient JSON schema validators available.
  • Getting Started with Fastify for Node.js
    4 projects | dev.to | 5 May 2023
    In Fastify, JSON schema validation is a built-in feature that allows you to validate the payload of incoming requests before the handler function is executed. This ensures that incoming data is in the expected format and meets the required criteria for your business logic. Fastify's JSON schema validation is powered by the Ajv library, a fast and efficient JSON schema validator.
  • How can we map data from JSON to typescript object efficiently?
    4 projects | /r/reactjs | 30 Apr 2023
    I think you're looking for a json schema validator like Ajv or Zod.
  • 5 useful JSON tools to improve your productivity
    4 projects | dev.to | 11 Apr 2023
    We can use JSON Schema to validate that our data adheres to a specific structure. Ajv is one popular validator tool for JavaScript applications that allows us to create a schema and then validate JSON against that schema. Here's an example of using Ajv to validate one of the above JSON examples against a schema:
  • Ask HN: JSON API object type definitions and validation in 2023?
    2 projects | news.ycombinator.com | 23 Mar 2023
    Hey HN,

    We're designing a new system and have been kicking the can about JSON object definitions and validation. Soon we need to settle on a system to validate API request bodies and provide helpful error messages.

    In the past, I've used JSON Schema ( https://json-schema.org/ ) to define definitions and ajv ( https://ajv.js.org/ ) to validate, but it's a bit verbose and ajv validation errors are more cryptic than I'd like to deal with.

    TypeSchema looks interesting. It seems solid (and perhaps stable?), but development hasn't been active for 2 years. It also looks like we'd still need to generate JSON Schema and choose a validation library

    Anyway, I'm very curious how others are approaching this problem. How do you organize and generate validations for your type definitions? What libraries do you use to validate and provide human readable error messages?

    Thank you!

  • Node.js Express API Data Validation: Techniques and Examples
    2 projects | /r/node | 16 Mar 2023
    Fastify uses ajv for data validation under the hood. I'd recommend ArkType or Zod
  • How to handle forms in a good way?
    2 projects | /r/sveltejs | 19 Jan 2023
    I've used Felte to reduce form boilerplate. Felte supports several different validation libraries like Zod. I actually used a custom validation function with ajv (which uses JSON schema).

Yup

Posts with mentions or reviews of Yup. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-03-18.
  • Using React Select with Formik
    2 projects | dev.to | 18 Mar 2024
    I was recently building an application that, among other features, allows a user to submit chess players and chess games to a database. I was utilizing Yup for form schema and Formik for error handling, validation, and form submission.
  • A simple Vue form validation composable with Zod
    6 projects | dev.to | 9 Dec 2023
    Sometimes our use case might not require a full-blown form validation library though and we might already have a schema validation library installed in our project such as Zod or Yup. In that case, a simple Vue composable is all that is needed to provide a great form validation UX.
  • Top 5 form validation libraries in React JS and Next JS
    5 projects | dev.to | 29 Sep 2023
    GitHub Repository:
  • Enhancing Redwood: A Guide to Implementing Zod for Data Validation and Schema Sharing Between the API and Web Layers
    6 projects | dev.to | 24 Sep 2023
    I'm currently experimenting with the fantastic Redwood framework. However, while going through the excellent tutorial, I didn't find any guidance on using data validation libraries like Yup, Zod, Vest, etc. So, I had to do some investigation and came up with a solution. This article describes the implementation of validation with Zod in a fresh Redwood app. You can find the sources at this github repository.
  • Creating a form In React Native With Formik
    6 projects | dev.to | 31 Aug 2023
    Do you want to create a form in your React Native app but don't know how? Then this post is for you! In this post I will teach you how to create forms using a library called Formik , as well as how to integrate non-native form components with Formik. Additionally you will learn how to validate forms using Yup (which Formik supports out of the box)
  • Authentication in Next.js with Supabase Auth and PKCE
    4 projects | dev.to | 8 Aug 2023
    The project has two authenticated pages - Home and Profile. Unauthenticated users can Sign In, Sign Up, Reset Password and Update Password. All of this is powered by Next.js app router, with usage of both Client and Server Components, and Supabase handling all of the authentication related functionality. Forms are built using Formik and Yup for field validation.
  • The DynamoDB-Toolbox v1 beta is here 🙌 All you need to know!
    3 projects | dev.to | 9 Jun 2023
    Similarly to zod or yup, attributes are now defined through function builders. For TS users, this removes the need for the as const statement previously needed for type inference (so don't forget to remove it when you migrate 🙈).
  • Htmx Is the Future
    9 projects | news.ycombinator.com | 5 May 2023
    I think the main concern for frontend validation was before HTML5 came along with validation attributes. You can easily produce HTML input validation attributes from a Yup schema for example by using its serialization feature (https://github.com/jquense/yup#schemadescribeoptions-resolve...).
  • Banditypes: The mighty 400-byte schema validator for TS / JS
    5 projects | /r/webdev | 27 Feb 2023
    Banditstash, like all the newer validation libraries (yup, zod, superstruct, typed) can auto-generate TS type from a JS schema:
  • Formik Works Great; Here's Why I Wrote My Own
    4 projects | dev.to | 18 Feb 2023
    Not only is this example shorter than even the Angular example, but it's significantly easier to follow the flow of what's happening and when. On top of this, we're able to use existing validation logic from the exceedingly popular Yup library to make sure our form follows a consistent schema.

What are some alternatives?

When comparing ajv and Yup you can also consider the following projects:

joi - The most powerful data validation library for JS [Moved to: https://github.com/hapijs/joi]

joi - The most powerful data validation library for JS [Moved to: https://github.com/sideway/joi]

zod - TypeScript-first schema validation with static type inference

Superstruct - A simple and composable way to validate data in JavaScript (and TypeScript).

tv4 - Tiny Validator for JSON Schema v4

jest - Delightful JavaScript Testing.

class-validator - Decorator-based property validation for classes.

typebox - Json Schema Type Builder with Static Type Resolution for TypeScript

react-hook-form - 📋 React Hooks for form state management and validation (Web + React Native)

Nuxt.js - Nuxt is an intuitive and extendable way to create type-safe, performant and production-grade full-stack web apps and websites with Vue 3. [Moved to: https://github.com/nuxt/nuxt]