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Top 10 TypeScript Data Validation Projects
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NPM github/yup
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SurveyJS
JavaScript Form Builder with No-Code UI & Built-In JSON Schema Editor. Add the SurveyJS white-label form builder to your JavaScript app (React/Angular/Vue3). Build complex JSON forms without coding. Fully customizable, works with any backend, perfect for data-heavy apps. Learn more.
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Thanks for your feedback !
It does not rely on JSON schema at all, the idea was to build a representation that binds together data structure, views and behavior in a self-contained way (like .xlsx does).
There are a few tools that do enable to link JSON schema to views, like react-jsonschema-form (https://rjsf-team.github.io/react-jsonschema-form/) but you need to manage them separately, and they usually do not propose a way to add the fields "methods" (which was the feature I found interesting to make "dynamic" spreadsheets).
That being said, I think the framework should clearly propose an export from Schema to JSON Schema or Yaml at some point, just as you should be able to start building your Schema by importing a JSON Schema (and although there might be some gray zones between the 2).
No, sorry, it's not yet open-source, and currently there are some strong links between Document and Workspace (Links, Files...) that would need to be more "abstracted" to make the builder an independent component. But I hear you point ! (and all the comments in this thread are raising the same ! :) )
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ajv
The fastest JSON schema Validator. Supports JSON Schema draft-04/06/07/2019-09/2020-12 and JSON Type Definition (RFC8927)
Project mention: Show HN: A lightweight LLM proxy to get structured results from most LLMs | news.ycombinator.com | 2025-02-27 -
One of the most basic applications of ReScript Schema is parsing - Accepting unknown JavaScript data, validating it, and returning the result of your desired type. There are dozens of such libraries, and the most popular ones are Zod, Valibot, Runtypes, Arktype, Typia, Superstruct, Effect Schema, and more. Also, even though this is slightly different, validation libraries like Ajv, Yup, and others also stand really close.
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OpenMetadata
OpenMetadata is a unified metadata platform for data discovery, data observability, and data governance powered by a central metadata repository, in-depth column level lineage, and seamless team collaboration.
Project mention: Show HN: OpenMetadata – OSS platform for data discovery observability governance | news.ycombinator.com | 2024-07-17* It seems like DataHub has an async Kafka ingestion approach while OpenMetadata is API
We do not use Kafka by default. If someone needs kafka they can add it. However for Metadata APIs, we do not feel like Kafka is needed. Lot of projects are getting dependent on Kafka and calling it as real-time. Its unnecessary burden on users who are going to operate in production for 99% of use-cases Kafka is not needed, coming from a Kafka committer :)
2. Yes all of our APIs and Entity definitions are generated using JsonSchema. For us, Json Schema has been awesome, all of our backend / ingestion and UI is generated from JsonSchema and its easy to extend and add new models when needed
3. IMO, we have much more coverage , you can look at the types available here https://github.com/open-metadata/OpenMetadata/tree/main/open... and we are support JsonSchema as a type from a long time
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openapi-cop
A proxy that validates responses and requests against an OpenAPI document. https://www.npmjs.com/package/openapi-cop https://hub.docker.com/r/lxlu/openapi-cop
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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impler.io
Powerful CSV & Excel Import experience for SaaS 🚀 Save months building data import experience from scratch 💰
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express-joi-validations
Express middleware to validate request (headers, params, query, body) using Joi
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
TypeScript Data Validation discussion
TypeScript Data Validation related posts
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Validações com biblioteca Yup
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Formik & React (Part 3): Validation with yup & Streamlining Code
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Show HN: A lightweight LLM proxy to get structured results from most LLMs
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How I Built a SpeedtestTracker with Raspberry PI and AWS Lambda
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"yup" is the new extra virgin olive oil
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Fixing and Validating JSON with Ease: An In-Depth Guide
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What is JSON Merge Patch?
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A note from our sponsor - SaaSHub
www.saashub.com | 18 May 2025
Index
What are some of the best open-source Data Validation projects in TypeScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Yup | 23,356 |
| 2 | react-jsonschema-form | 14,826 |
| 3 | ajv | 14,199 |
| 4 | Superstruct | 7,115 |
| 5 | OpenMetadata | 6,682 |
| 6 | openapi-cop | 371 |
| 7 | recce | 363 |
| 8 | impler.io | 236 |
| 9 | Safen | 38 |
| 10 | express-joi-validations | 0 |
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Add the SurveyJS white-label form builder to your JavaScript app (React/Angular/Vue3). Build complex JSON forms without coding. Fully customizable, works with any backend, perfect for data-heavy apps. Learn more.
surveyjs.io