Mock JSON · Response data · JSON Schema — 3 modes

Convert GraphQL to JSON
Mock data, response
or JSON Schema.

Generate mock JSON from a GraphQL SDL type, extract clean JSON from a GraphQL response, or convert SDL to JSON Schema. Three modes, one tool.

Your data never leaves your browser
SDL → mock JSON
Response → clean data{}
SDL → JSON Schema
Always free
GraphQL to JSON — 3 modes   100% client-side
GraphQL SDL input
  Ready 

      

 
    

  

 
  
  
GraphQL SDL → JSON type mapping

  

    
GraphQL scalarMock JSON valueJSON Schema type

    
      
String!"string_value"{"type":"string"}

      
Int!42{"type":"integer"}

      
Float!3.14{"type":"number"}

      
Boolean!true{"type":"boolean"}

      
ID!"1"{"type":"string"}

      
[String!]!["string_value"]{"type":"array","items":{"type":"string"}}

      
NestedType!{...}{"$ref":"#/$defs/NestedType"}

      
String (nullable)null{"type":["string","null"]}

    
  

 
  

 
  
  

    
      

      
JSON → GraphQL

      
Reverse — generate GraphQL schema from a JSON sample.

      
730 searches/month

    
    
      

      
JSON → JSON Schema

      
Generate JSON Schema from a JSON sample directly.

      
7,510 searches/month

    
    
      

      
JSON → TypeScript

      
Generate TypeScript interfaces from JSON.

      
14,470 searches/month

    
  

 
  
  

    
Popular searches

    

      graphql to json
      graphql query to json
      convert graphql to json
      graphql to json schema
      graphql schema to json
      graphql to json online
      graphql to json converter
      convert graphql query to json
      graphql response to json
      graphql schema to json schema
    

  

 
  

 
  
  

    

      
GraphQL parsed in your
browser. No server needed.

      
The SDL parser uses regex to extract type definitions, field names and type modifiers without a full GraphQL parser library — no CDN dependency. Nested types are resolved recursively with a depth limit to prevent cycles. The Response mode simply extracts data from the GraphQL envelope — works with any valid GraphQL JSON response.

    

    

      
3 modes
SDL → Mock JSON for testing, Response → data for API debugging, SDL → JSON Schema for validation.

      
Nested type resolution
Nested GraphQL types are recursively resolved to generate realistic mock data for the full object graph.

      
Non-null aware
The ! modifier is respected — non-null fields get real mock values, nullable fields get null in the JSON Schema output.

      
47 tools, always free
No file size limits, no watermarks, no account. Funded by non-intrusive display advertising only.

    

  

 
  
  

    
Frequently asked questions

    

      
How do I generate mock JSON from a GraphQL schema?

      
Select the Mock JSON mode, paste your GraphQL SDL type definitions, enter the type name you want to mock (or leave blank for the first type found), and click Generate. Nested types are resolved automatically.

    

    

      
How do I extract clean JSON from a GraphQL response?

      
Select the Response mode, paste the full GraphQL JSON response (the one with data and errors fields), and click Extract. The tool pulls out the data field and formats it as clean JSON. If errors are present, they are also shown separately.

    

    

      
Is the GraphQL to JSON converter free?

      
Yes, completely free. No file size limits, no account required.

    

  

 


				
	
		
	


			
		
				
	

	
		
		



 

	
	

	
	
	
	
			
		Go up