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superstruct

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

  • 2.0.3-1
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  • npm
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1.6M
decreased by-2.46%
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What is superstruct?

The superstruct npm package is a library for validating, coercing, and structuring data in JavaScript and TypeScript. It allows developers to define interfaces and run-time type checks for JavaScript data structures, ensuring that data conforms to specified schemas.

What are superstruct's main functionalities?

Validation

Superstruct can be used to validate data against a defined schema. The example shows how to define a User struct and validate an object against it.

{"User": "const User = struct({name: 'string', age: 'number'}); const data = {name: 'Alice', age: 25}; const [error, user] = User.validate(data); if (error) { throw error; }"}

Coercion

Superstruct can coerce data to match a schema by applying default values. In the example, a UserWithDefaults struct is defined with an optional isAdmin field that defaults to false.

{"UserWithDefaults": "const UserWithDefaults = struct({name: 'string', age: 'number', isAdmin: 'boolean?'}); const data = {name: 'Bob', age: 30}; const user = UserWithDefaults.create(data);"}

Partial Structs

Superstruct allows creating partial structs, which can validate data that may not include all fields of the struct. The example demonstrates how to define a partial struct based on the User struct.

{"PartialUser": "const User = struct({name: 'string', age: 'number'}); const PartialUser = struct.partial(User); const data = {name: 'Charlie'}; const [error, partialUser] = PartialUser.validate(data); if (error) { throw error; }"}

Dynamic Structs

Superstruct can define dynamic structs that change based on the input data. The example shows a DynamicUser struct that requires a permissions array only if the isAdmin property is true.

{"DynamicUser": "const DynamicUser = struct.dynamic((value, branch, path) => { if (value && value.isAdmin) { return struct({name: 'string', age: 'number', permissions: 'array'}); } else { return struct({name: 'string', age: 'number'}); } }); const data = {name: 'Dave', age: 40, isAdmin: true, permissions: ['read', 'write']}; const [error, dynamicUser] = DynamicUser.validate(data); if (error) { throw error; }"}

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Package last updated on 27 Jul 2024

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