tags: api/space-lua references:

• plug-api/syscalls/jsonschema.ts
• client/plugos/syscalls/jsonschema.ts

The JSON Schema API provides functions for validating JSON objects against JSON schemas.

jsonschema.inferFromObject

jsonschema.inferFromObject(object)

Infers a best-effort draft 2020-12 JSON Schema from a sample value.

Parameters:

• object — Sample value whose shape is inferred.

Returns:

• table — Inferred schema marked x-inferred.

Example:

local schema = jsonschema.inferFromObject({name = "Widget", count = 3})

jsonschema.validateObject

jsonschema.validateObject(schema, object)

Validates a value against a JSON Schema.

Parameters:

• schema (table) — JSON Schema to apply.
• object — Value to validate.

Returns:

• string — Validation error, or nil when valid.

Example:

local schema = {type = "object", properties = {name = {type = "string"}}, required = {"name"}}
local err = jsonschema.validateObject(schema, {name = "John"})

jsonschema.validateSchema

jsonschema.validateSchema(schema)

Checks whether a JSON Schema has a supported top-level shape.

Parameters:

• schema — JSON Schema to validate.

Returns:

• string — Schema error, or nil when valid.

Example:

local err = jsonschema.validateSchema({type = "object"})