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example_test.go
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example_test.go
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package jsonschema_test
import (
"encoding/json"
"fmt"
"log"
"reflect"
"strings"
"github.com/swaggest/assertjson"
"github.com/swaggest/jsonschema-go"
)
// WeirdResp hides sample structure.
type WeirdResp interface {
Boo()
}
// NamedAnything is an empty interface.
type NamedAnything interface{}
// UUID represents type owned by 3rd party library.
type UUID [16]byte
// Resp is a sample structure.
type Resp struct {
Field1 int `json:"field1"`
Field2 string `json:"field2"`
Info struct {
Foo string `json:"foo" default:"baz" required:"true" pattern:"\\d+"`
Bar float64 `json:"bar" description:"This is Bar."`
} `json:"info"`
Parent *Resp `json:"parent,omitempty"`
Map map[string]int64 `json:"map,omitempty"`
MapOfAnything map[string]interface{} `json:"mapOfAnything,omitempty"`
ArrayOfAnything []interface{} `json:"arrayOfAnything,omitempty"`
ArrayOfNamedAnything []NamedAnything `json:"arrayOfNamedAnything,omitempty"`
Whatever interface{} `json:"whatever"`
NullableWhatever *interface{} `json:"nullableWhatever,omitempty"`
RecursiveArray []WeirdResp `json:"recursiveArray,omitempty"`
RecursiveStructArray []Resp `json:"recursiveStructArray,omitempty"`
UUID UUID `json:"uuid"`
}
// Description implements jsonschema.Described.
func (r *Resp) Description() string {
return "This is a sample response."
}
// Title implements jsonschema.Titled.
func (r *Resp) Title() string {
return "Sample Response"
}
var _ jsonschema.Preparer = &Resp{}
func (r *Resp) PrepareJSONSchema(s *jsonschema.Schema) error {
s.WithExtraPropertiesItem("x-foo", "bar")
return nil
}
func ExampleReflector_InlineDefinition() {
reflector := jsonschema.Reflector{}
// Create custom schema mapping for 3rd party type.
uuidDef := jsonschema.Schema{}
uuidDef.AddType(jsonschema.String)
uuidDef.WithFormat("uuid")
uuidDef.WithExamples("248df4b7-aa70-47b8-a036-33ac447e668d")
// Map 3rd party type with your own schema.
reflector.AddTypeMapping(UUID{}, uuidDef)
reflector.InlineDefinition(UUID{})
type MyStruct struct {
ID UUID `json:"id"`
}
schema, _ := reflector.Reflect(MyStruct{})
schemaJSON, _ := json.MarshalIndent(schema, "", " ")
fmt.Println(string(schemaJSON))
// Output:
// {
// "properties": {
// "id": {
// "examples": [
// "248df4b7-aa70-47b8-a036-33ac447e668d"
// ],
// "type": "string",
// "format": "uuid"
// }
// },
// "type": "object"
// }
}
func ExampleReflector_AddTypeMapping_schema() {
reflector := jsonschema.Reflector{}
// Create custom schema mapping for 3rd party type.
uuidDef := jsonschema.Schema{}
uuidDef.AddType(jsonschema.String)
uuidDef.WithFormat("uuid")
uuidDef.WithExamples("248df4b7-aa70-47b8-a036-33ac447e668d")
// Map 3rd party type with your own schema.
reflector.AddTypeMapping(UUID{}, uuidDef)
type MyStruct struct {
ID UUID `json:"id"`
}
schema, _ := reflector.Reflect(MyStruct{})
schemaJSON, _ := json.MarshalIndent(schema, "", " ")
fmt.Println(string(schemaJSON))
// Output:
// {
// "definitions": {
// "JsonschemaGoTestUUID": {
// "examples": [
// "248df4b7-aa70-47b8-a036-33ac447e668d"
// ],
// "type": "string",
// "format": "uuid"
// }
// },
// "properties": {
// "id": {
// "$ref": "#/definitions/JsonschemaGoTestUUID"
// }
// },
// "type": "object"
// }
}
func ExampleReflector_AddTypeMapping_type() {
reflector := jsonschema.Reflector{}
// Map 3rd party type with a different type.
// Reflector will perceive all UUIDs as plain strings.
reflector.AddTypeMapping(UUID{}, "")
type MyStruct struct {
ID UUID `json:"id"`
}
schema, _ := reflector.Reflect(MyStruct{})
schemaJSON, _ := json.MarshalIndent(schema, "", " ")
fmt.Println(string(schemaJSON))
// Output:
// {
// "properties": {
// "id": {
// "type": "string"
// }
// },
// "type": "object"
// }
}
func ExampleReflector_Reflect() {
reflector := jsonschema.Reflector{}
// Create custom schema mapping for 3rd party type.
uuidDef := jsonschema.Schema{}
uuidDef.AddType(jsonschema.String)
uuidDef.WithFormat("uuid")
uuidDef.WithExamples("248df4b7-aa70-47b8-a036-33ac447e668d")
// Map 3rd party type with your own schema.
reflector.AddTypeMapping(UUID{}, uuidDef)
// Map the type that does not expose schema information to a type with schema information.
reflector.AddTypeMapping(new(WeirdResp), new(Resp))
// Modify default definition names to better match your packages structure.
reflector.DefaultOptions = append(reflector.DefaultOptions, jsonschema.InterceptDefName(
func(_ reflect.Type, defaultDefName string) string {
return strings.TrimPrefix(defaultDefName, "JsonschemaGoTest")
},
))
// Create schema from Go value.
schema, err := reflector.Reflect(new(Resp))
if err != nil {
log.Fatal(err)
}
j, err := assertjson.MarshalIndentCompact(schema, "", " ", 80)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(j))
// Output:
// {
// "title":"Sample Response","description":"This is a sample response.",
// "definitions":{
// "NamedAnything":{},
// "UUID":{
// "examples":["248df4b7-aa70-47b8-a036-33ac447e668d"],"type":"string",
// "format":"uuid"
// }
// },
// "properties":{
// "arrayOfAnything":{"items":{},"type":"array"},
// "arrayOfNamedAnything":{"items":{"$ref":"#/definitions/NamedAnything"},"type":"array"},
// "field1":{"type":"integer"},"field2":{"type":"string"},
// "info":{
// "required":["foo"],
// "properties":{
// "bar":{"description":"This is Bar.","type":"number"},
// "foo":{"default":"baz","pattern":"\\d+","type":"string"}
// },
// "type":"object"
// },
// "map":{"additionalProperties":{"type":"integer"},"type":"object"},
// "mapOfAnything":{"additionalProperties":{},"type":"object"},
// "nullableWhatever":{},"parent":{"$ref":"#"},
// "recursiveArray":{"items":{"$ref":"#"},"type":"array"},
// "recursiveStructArray":{"items":{"$ref":"#"},"type":"array"},
// "uuid":{"$ref":"#/definitions/UUID"},"whatever":{}
// },
// "type":"object","x-foo":"bar"
// }
}
func ExampleReflector_Reflect_simple() {
type MyStruct struct {
Amount float64 `json:"amount" minimum:"10.5" example:"20.6" required:"true"`
Abc string `json:"abc" pattern:"[abc]"`
_ struct{} `additionalProperties:"false"` // Tags of unnamed field are applied to parent schema.
_ struct{} `title:"My Struct" description:"Holds my data."` // Multiple unnamed fields can be used.
}
reflector := jsonschema.Reflector{}
schema, err := reflector.Reflect(MyStruct{})
if err != nil {
log.Fatal(err)
}
j, err := json.MarshalIndent(schema, "", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println(string(j))
// Output:
// {
// "title": "My Struct",
// "description": "Holds my data.",
// "required": [
// "amount"
// ],
// "additionalProperties": false,
// "properties": {
// "abc": {
// "pattern": "[abc]",
// "type": "string"
// },
// "amount": {
// "examples": [
// 20.6
// ],
// "minimum": 10.5,
// "type": "number"
// }
// },
// "type": "object"
// }
}
func ExamplePropertyNameMapping() {
reflector := jsonschema.Reflector{}
type Test struct {
ID int `minimum:"123" default:"200"`
Name string `minLength:"10"`
}
s, err := reflector.Reflect(new(Test),
// PropertyNameMapping allows configuring property names without field tag.
jsonschema.PropertyNameMapping(map[string]string{
"ID": "ident",
"Name": "last_name",
}))
if err != nil {
panic(err)
}
j, err := assertjson.MarshalIndentCompact(s, "", " ", 80)
if err != nil {
panic(err)
}
fmt.Println(string(j))
// Output:
// {
// "properties":{
// "ident":{"default":200,"minimum":123,"type":"integer"},
// "last_name":{"minLength":10,"type":"string"}
// },
// "type":"object"
// }
}
func ExampleInterceptProp() {
reflector := jsonschema.Reflector{}
type Test struct {
ID int `json:"id" minimum:"123" default:"200"`
Name string `json:"name" minLength:"10"`
Skipped float64 `json:"skipped"`
}
s, err := reflector.Reflect(new(Test),
// PropertyNameMapping allows configuring property names without field tag.
jsonschema.InterceptProp(
func(params jsonschema.InterceptPropParams) error {
switch params.Name {
// You can alter reflected schema by updating propertySchema.
case "id":
if params.Processed {
params.PropertySchema.WithDescription("This is ID.")
// You can access schema that holds the property.
params.PropertySchema.Parent.WithDescription("Schema with ID.")
}
// Or you can entirely remove property from parent schema with a sentinel error.
case "skipped":
return jsonschema.ErrSkipProperty
}
return nil
},
),
)
if err != nil {
panic(err)
}
j, err := assertjson.MarshalIndentCompact(s, "", " ", 80)
if err != nil {
panic(err)
}
fmt.Println(string(j))
// Output:
// {
// "description":"Schema with ID.",
// "properties":{
// "id":{"description":"This is ID.","default":200,"minimum":123,"type":"integer"},
// "name":{"minLength":10,"type":"string"}
// },
// "type":"object"
// }
}
func ExampleOneOf() {
r := jsonschema.Reflector{}
type Test struct {
Foo jsonschema.OneOfExposer `json:"foo"`
Bar jsonschema.OneOfExposer `json:"bar"`
}
tt := Test{
Foo: jsonschema.OneOf(1.23, "abc"),
Bar: jsonschema.OneOf(123, true),
}
s, _ := r.Reflect(tt, jsonschema.RootRef)
b, _ := assertjson.MarshalIndentCompact(s, "", " ", 100)
fmt.Println("Complex schema:", string(b))
s, _ = r.Reflect(jsonschema.OneOf(123, true), jsonschema.RootRef)
b, _ = assertjson.MarshalIndentCompact(s, "", " ", 100)
fmt.Println("Simple schema:", string(b))
// Output:
// Complex schema: {
// "$ref":"#/definitions/JsonschemaGoTestTest",
// "definitions":{
// "JsonschemaGoTestTest":{
// "properties":{
// "bar":{"oneOf":[{"type":"integer"},{"type":"boolean"}]},
// "foo":{"oneOf":[{"type":"number"},{"type":"string"}]}
// },
// "type":"object"
// }
// }
// }
// Simple schema: {"oneOf":[{"type":"integer"},{"type":"boolean"}]}
}
func ExampleAnyOf() {
r := jsonschema.Reflector{}
type Test struct {
Foo jsonschema.AnyOfExposer `json:"foo"`
Bar jsonschema.AnyOfExposer `json:"bar"`
}
tt := Test{
Foo: jsonschema.AnyOf(1.23, "abc"),
Bar: jsonschema.AnyOf(123, true),
}
s, _ := r.Reflect(tt, jsonschema.RootRef)
b, _ := assertjson.MarshalIndentCompact(s, "", " ", 100)
fmt.Println("Complex schema:", string(b))
s, _ = r.Reflect(jsonschema.AnyOf(123, true), jsonschema.RootRef)
b, _ = assertjson.MarshalIndentCompact(s, "", " ", 100)
fmt.Println("Simple schema:", string(b))
// Output:
// Complex schema: {
// "$ref":"#/definitions/JsonschemaGoTestTest",
// "definitions":{
// "JsonschemaGoTestTest":{
// "properties":{
// "bar":{"anyOf":[{"type":"integer"},{"type":"boolean"}]},
// "foo":{"anyOf":[{"type":"number"},{"type":"string"}]}
// },
// "type":"object"
// }
// }
// }
// Simple schema: {"anyOf":[{"type":"integer"},{"type":"boolean"}]}
}
func ExampleAllOf() {
r := jsonschema.Reflector{}
type Test struct {
Foo jsonschema.AllOfExposer `json:"foo"`
Bar jsonschema.AllOfExposer `json:"bar"`
}
tt := Test{
Foo: jsonschema.AllOf(1.23, "abc"),
Bar: jsonschema.AllOf(123, true),
}
s, _ := r.Reflect(tt, jsonschema.RootRef)
b, _ := assertjson.MarshalIndentCompact(s, "", " ", 100)
fmt.Println("Complex schema:", string(b))
s, _ = r.Reflect(jsonschema.AllOf(123, true), jsonschema.RootRef)
b, _ = assertjson.MarshalIndentCompact(s, "", " ", 100)
fmt.Println("Simple schema:", string(b))
// Output:
// Complex schema: {
// "$ref":"#/definitions/JsonschemaGoTestTest",
// "definitions":{
// "JsonschemaGoTestTest":{
// "properties":{
// "bar":{"allOf":[{"type":"integer"},{"type":"boolean"}]},
// "foo":{"allOf":[{"type":"number"},{"type":"string"}]}
// },
// "type":"object"
// }
// }
// }
// Simple schema: {"allOf":[{"type":"integer"},{"type":"boolean"}]}
}
func ExampleReflector_Reflect_default() {
type MyStruct struct {
A []string `json:"a" default:"[A,B,C]"` // For an array of strings, comma-separated values in square brackets can be used.
B []int `json:"b" default:"[1,2,3]"` // Other non-scalar values are parsed as JSON without type checking.
C []string `json:"c" default:"[\"C\",\"B\",\"A\"]"`
D int `json:"d" default:"123"` // Scalar values are parsed according to their type.
E string `json:"e" default:"abc"`
F map[string]int `json:"f" default:"{\"foo\":1,\"bar\":2}"`
}
type Invalid struct {
I []int `json:"i" default:"[C,B,A]"` // Value with invalid JSON is ignored for types other than []string (and equivalent).
}
r := jsonschema.Reflector{}
s, _ := r.Reflect(MyStruct{})
_, err := r.Reflect(Invalid{})
j, _ := assertjson.MarshalIndentCompact(s, "", " ", 80)
fmt.Println("MyStruct:", string(j))
fmt.Println("Invalid error:", err.Error())
// Output:
// MyStruct: {
// "properties":{
// "a":{"default":["A","B","C"],"items":{"type":"string"},"type":["array","null"]},
// "b":{"default":[1,2,3],"items":{"type":"integer"},"type":["array","null"]},
// "c":{"default":["C","B","A"],"items":{"type":"string"},"type":["array","null"]},
// "d":{"default":123,"type":"integer"},"e":{"default":"abc","type":"string"},
// "f":{
// "default":{"bar":2,"foo":1},"additionalProperties":{"type":"integer"},
// "type":["object","null"]
// }
// },
// "type":"object"
// }
// Invalid error: I: parsing default as JSON: invalid character 'C' looking for beginning of value
}
func ExampleReflector_Reflect_virtualStruct() {
s := jsonschema.Struct{}
s.SetTitle("Test title")
s.SetDescription("Test description")
s.DefName = "TestStruct"
s.Nullable = true
s.Fields = append(s.Fields, jsonschema.Field{
Name: "Foo",
Value: "abc",
Tag: `json:"foo" minLength:"3"`,
})
r := jsonschema.Reflector{}
schema, _ := r.Reflect(s)
j, _ := assertjson.MarshalIndentCompact(schema, "", " ", 80)
fmt.Println("Standalone:", string(j))
type MyStruct struct {
jsonschema.Struct // Can be embedded.
Bar int `json:"bar"`
Nested jsonschema.Struct `json:"nested"` // Can be nested.
}
ms := MyStruct{}
ms.Nested = s
ms.Struct = s
schema, _ = r.Reflect(ms)
j, _ = assertjson.MarshalIndentCompact(schema, "", " ", 80)
fmt.Println("Nested:", string(j))
// Output:
// Standalone: {
// "title":"Test title","description":"Test description",
// "properties":{"foo":{"minLength":3,"type":"string"}},"type":"object"
// }
// Nested: {
// "title":"Test title","description":"Test description",
// "properties":{
// "bar":{"type":"integer"},"foo":{"minLength":3,"type":"string"},
// "nested":{"$ref":"#"}
// },
// "type":"object"
// }
}