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Validate with Pema

Pema stands for Primate schema. Use Pema for type-safe validation of data. See the complete Pema reference for every schema family and method.

Pema provides composable validators for common types.

Basic usage

Import and use validators.

import p from "pema";

const Schema = p({
  name: p.string.min(1),
  age: p.number.min(0),
});

const data = Schema.parse({ name: "John", age: 30 });

Built-in validators

  • string: String validation
  • number: Number validation
  • boolean: Boolean validation
  • array: Array validation
  • object: Object validation

Chaining

Chain validators for complex rules.

import p from "pema";

const EmailSchema = p.string.min(1).max(255).email();
const AgeSchema = p.uint.max(150);

Error handling

Validation throws ParseError with details.

try {
  Schema.parse(input);
} catch (error) {
  console.log(error.issues); // structured issues and paths
}