ianstormtaylor/superstruct

Health v2 · maintenance only

Adoption not part of the score

7134 stars · 223 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Superstruct is a JavaScript and TypeScript library for defining data schemas (structs) and validating arbitrary data against them at runtime. It offers a composable, TypeScript-inspired API with detailed error reporting, data coercion, and custom validators.

Use cases

• validate request bodies in a REST or GraphQL API
• validate JSON data parsed from untrusted input
• define runtime-checked interfaces for TypeScript data
• coerce input data with default values before validation
• validate nested objects and arrays with custom validators
• check configuration files or environment data shapes

When to choose

• you need runtime validation of arbitrary input in JavaScript or TypeScript
• you want detailed, human-readable validation errors
• you prefer a small, composable schema API inspired by TypeScript types
• you need to validate and coerce data with defaults

When to avoid

• you only need compile-time type checking with no runtime validation
• you need extremely high-performance validation of huge datasets
• your team is standardized on another validator like Zod or Joi and interop matters

Facets

library · maturity stable

serialization developer-tools developer-tools web-development apis browser cross-platform runtime-validation schema-validation typescript data-validation type-safety nodejs

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