Generate json-schemas from your Typescript sources.
- Compiles your Typescript program to get complete type information.
- Translates required properties, extends, annotation keywords, property initializers as defaults. You can find examples for these features in the test examples.
- Install with
npm install typescript-json-schema -g - Generate schema from a typescript type:
typescript-json-schema project/directory/tsconfig.json TYPE
To generate files for only some types in tsconfig.json specify
filenames or globs with the --include option. This is especially useful for large projects.
In case no tsconfig.json is available for your project, you can directly specify the .ts files (this in this case we use some built-in compiler presets):
- Generate schema from a typescript type:
typescript-json-schema "project/directory/**/*.ts" TYPE
The TYPE can either be a single, fully qualified type or "*" to generate the schema for all types.
Usage: typescript-json-schema <path-to-typescript-files-or-tsconfig> <type>
Options:
--refs Create shared ref definitions. [boolean] [default: true]
--aliasRefs Create shared ref definitions for the type aliases. [boolean] [default: false]
--topRef Create a top-level ref definition. [boolean] [default: false]
--titles Creates titles in the output schema. [boolean] [default: false]
--desctitles Use first line of the description as the title. [boolean] [default: false]
--defaultProps Create default properties definitions. [boolean] [default: false]
--noExtraProps Disable additional properties in objects by default. [boolean] [default: false]
--propOrder Create property order definitions. [boolean] [default: false]
--required Create required array for non-optional properties. [boolean] [default: false]
--strictNullChecks Make values non-nullable by default. [boolean] [default: false]
--useTypeOfKeyword Use `typeOf` keyword (https://goo.gl/DC6sni) for functions. [boolean] [default: false]
--out, -o The output file, defaults to using stdout
--validationKeywords Provide additional validation keywords to include [array] [default: []]
--include Further limit tsconfig to include only matching files [array] [default: []]
--ignoreErrors Generate even if the program has errors. [boolean] [default: false]
--excludePrivate Exclude private members from the schema [boolean] [default: false]
--uniqueNames Use unique names for type symbols. [boolean] [default: false]
--rejectDateType Rejects Date fields in type definitions. [boolean] [default: false]
--id Set schema id. [string] [default: ""]
import {resolve} from "path";
import * as TJS from "typescript-json-schema";
// optionally pass argument to schema generator
const settings: TJS.PartialArgs = {
required: true
};
// optionally pass ts compiler options
const compilerOptions: TJS.CompilerOptions = {
strictNullChecks: true
}
// optionally pass a base path
const basePath = "./my-dir";
const program = TJS.getProgramFromFiles([resolve("my-file.ts")], compilerOptions, basePath);
// We can either get the schema for one file and one type...
const schema = TJS.generateSchema(program, "MyType", settings);
// ... or a generator that lets us incrementally get more schemas
const generator = TJS.buildGenerator(program, settings);
// all symbols
const symbols = generator.getUserSymbols();
// Get symbols for different types from generator.
generator.getSchemaForSymbol("MyType");
generator.getSchemaForSymbol("AnotherType");// In larger projects type names may not be unique,
// while unique names may be enabled.
const settings: TJS.PartialArgs = {
uniqueNames: true
};
const generator = TJS.buildGenerator(program, settings);
// A list of all types of a given name can then be retrieved.
const symbolList = generator.getSymbols("MyType");
// Choose the appropriate type, and continue with the symbol's unique name.
generator.getSchemaForSymbol(symbolList[1].name);
// Also it is possible to get a list of all symbols.
const fullSymbolList = generator.getSymbols();getSymbols('<SymbolName>') and getSymbols() return an array of SymbolRef, which is of the following format:
type SymbolRef = {
name: string;
typeName: string;
fullyQualifiedName: string;
symbol: ts.Symbol;
};getUserSymbols and getMainFileSymbols return an array of string.
The schema generator converts annotations to JSON schema properties.
For example
export interface Shape {
/**
* The size of the shape.
*
* @minimum 0
* @TJS-type integer
* @TJS-ui:autofocus true
*/
size: number;
}will be translated to
{
"$ref": "#/definitions/Shape",
"$schema": "http://json-schema.org/draft-07/schema#",
"definitions": {
"Shape": {
"properties": {
"size": {
"description": "The size of the shape.",
"minimum": 0,
"type": "integer",
"ui:autofocus": true
}
},
"type": "object"
}
}
}Note that we needed to use @TJS-type instead of just @type because of an issue with the typescript compiler.
Validation keywords are defined here: http://json-schema.org/latest/json-schema-validation.html
By default, ui:* annotations are also recognized;
this is intended to be useful for downstream extraction toward
packages such as react-jsonschema-form.
Annotations of the form @TJS-ui:foo bar take advantage of this feature.
You can define new validation keywords at the command line.
Wildcards are supported. For example, passing
--validationKeywords foo:* will cause the annotation
@TJS-foo:bar baz quux to match, so the property
foo:bar will take the value baz quux.
Inspired and builds upon Typson, but typescript-json-schema is compatible with more recent Typescript versions. Also, since it uses the Typescript compiler internally, more advanced scenarios are possible. If you are looking for a library that uses the AST instead of the type hierarchy and therefore better support for type aliases, have a look at vega/ts-json-schema-generator.
npm run debug -- test/programs/type-alias-single/main.ts --aliasRefs true MyString
And connect via the debugger protocol.