Standard Schema

A family of specs for interoperable TypeScript
standardschema.dev

The Standard Schema project is a set of interfaces that standardize the provision and consumption of shared functionality in the TypeScript ecosystem. Its goal is to allow tools to accept a single input that includes all the types and capabilities they need— no library-specific adapters, no extra dependencies. The result is an ecosystem that's fair for implementers, friendly for consumers, and open for end users. ## The specifications The specifications can be found below in their entirety. Libraries wishing to implement a spec can copy/paste the code block below into their codebase. They're also available at `@standard-schema/spec` on [npm](https://www.npmjs.com/package/@standard-schema/spec) and [JSR](https://jsr.io/@standard-schema/spec). ```ts // ######################### // ### Standard Typed ### // ######################### /** The Standard Typed interface. This is a base type extended by other specs. */ export interface StandardTypedV1 { /** The Standard properties. */ readonly "~standard": StandardTypedV1.Props; } export declare namespace StandardTypedV1 { /** The Standard Typed properties interface. */ export interface Props { /** The version number of the standard. */ readonly version: 1; /** The vendor name of the schema library. */ readonly vendor: string; /** Inferred types associated with the schema. */ readonly types?: Types | undefined; } /** The Standard Typed types interface. */ export interface Types { /** The input type of the schema. */ readonly input: Input; /** The output type of the schema. */ readonly output: Output; } /** Infers the input type of a Standard Typed. */ export type InferInput = NonNullable< Schema["~standard"]["types"] >["input"]; /** Infers the output type of a Standard Typed. */ export type InferOutput = NonNullable< Schema["~standard"]["types"] >["output"]; } // ########################## // ### Standard Schema ### // ########################## /** The Standard Schema interface. */ export interface StandardSchemaV1 { /** The Standard Schema properties. */ readonly "~standard": StandardSchemaV1.Props; } export declare namespace StandardSchemaV1 { /** The Standard Schema properties interface. */ export interface Props extends StandardTypedV1.Props { /** Validates unknown input values. */ readonly validate: ( value: unknown, options?: StandardSchemaV1.Options | undefined ) => Result | Promise>; } /** The result interface of the validate function. */ export type Result = SuccessResult | FailureResult; /** The result interface if validation succeeds. */ export interface SuccessResult { /** The typed output value. */ readonly value: Output; /** A falsy value for `issues` indicates success. */ readonly issues?: undefined; } export interface Options { /** Explicit support for additional vendor-specific parameters, if needed. */ readonly libraryOptions?: Record | undefined; } /** The result interface if validation fails. */ export interface FailureResult { /** The issues of failed validation. */ readonly issues: ReadonlyArray; } /** The issue interface of the failure output. */ export interface Issue { /** The error message of the issue. */ readonly message: string; /** The path of the issue, if any. */ readonly path?: ReadonlyArray | undefined; } /** The path segment interface of the issue. */ export interface PathSegment { /** The key representing a path segment. */ readonly key: PropertyKey; } /** The Standard types interface. */ export interface Types extends StandardTypedV1.Types {} /** Infers the input type of a Standard. */ export type InferInput = StandardTypedV1.InferInput; /** Infers the output type of a Standard. */ export type InferOutput = StandardTypedV1.InferOutput; } // ############################### // ### Standard JSON Schema ### // ############################### /** The Standard JSON Schema interface. */ export interface StandardJSONSchemaV1 { /** The Standard JSON Schema properties. */ readonly "~standard": StandardJSONSchemaV1.Props; } export declare namespace StandardJSONSchemaV1 { /** The Standard JSON Schema properties interface. */ export interface Props extends StandardTypedV1.Props { /** Methods for generating the input/output JSON Schema. */ readonly jsonSchema: StandardJSONSchemaV1.Converter; } /** The Standard JSON Schema converter interface. */ export interface Converter { /** Converts the input type to JSON Schema. May throw if conversion is not supported. */ readonly input: ( options: StandardJSONSchemaV1.Options ) => Record; /** Converts the output type to JSON Schema. May throw if conversion is not supported. */ readonly output: ( options: StandardJSONSchemaV1.Options ) => Record; } /** * The target version of the generated JSON Schema. * * It is *strongly recommended* that implementers support `"draft-2020-12"` and `"draft-07"`, as they are both in wide use. All other targets can be implemented on a best-effort basis. Libraries should throw if they don't support a specified target. * * The `"openapi-3.0"` target is intended as a standardized specifier for OpenAPI 3.0 which is a superset of JSON Schema `"draft-04"`. */ export type Target = | "draft-2020-12" | "draft-07" | "openapi-3.0" // Accepts any string for future targets while preserving autocomplete | ({} & string); /** The options for the input/output methods. */ export interface Options { /** Specifies the target version of the generated JSON Schema. Support for all versions is on a best-effort basis. If a given version is not supported, the library should throw. */ readonly target: Target; /** Explicit support for additional vendor-specific parameters, if needed. */ readonly libraryOptions?: Record | undefined; } /** The Standard types interface. */ export interface Types extends StandardTypedV1.Types {} /** Infers the input type of a Standard. */ export type InferInput = StandardTypedV1.InferInput; /** Infers the output type of a Standard. */ export type InferOutput = StandardTypedV1.InferOutput; } ```

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zip	dist/	12866	4	---	2026-09-25 16:03:31
-	LICENSE	1071		%	2026-09-25 16:03:31
-	README.md	7551		md	2026-09-25 16:03:31
-	package.json	1146		json	2026-09-25 16:03:31

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