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I'm a fan of typescript-is. Provides both compile time and run time validations
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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You can use https://github.com/collinecks/zod. It's very useful, and for example, when you receive a body on fetch an api, you can validate this.
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class-transformer
Decorator-based transformation, serialization, and deserialization between objects and classes.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.