Mock JSON · json.Marshal · Gin · Echo — 3 modes

Convert Go to JSON
Mock data, Marshal
snippets or framework.

Generate mock JSON from a Go struct, get json.Marshal snippets for every scenario, or get Gin, Echo and net/http JSON response patterns.

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Go struct → mock JSON
json.Marshal · NewEncoder snippets
Gin · Echo · net/http patterns
Always free
Go to JSON — 3 modes   100% client-side
Go struct input
  Ready 

      

 
    

  

 
  
  
json.Marshal vs json.NewEncoder

  
Two approaches — choose based on where you need the JSON.

  

    
json.Marshaljson.NewEncoder

    
      
Output[]byteWrites to io.Writer directly

      
Best forStoring in a variable, Redis, stringsHTTP responses, files, buffers

      
MemoryFull buffer in memoryStreams — more efficient for large payloads

      
Prettyjson.MarshalIndent(v, "", "  ")enc.SetIndent("", "  ")

      
NewlineNo trailing newlineAdds newline after each Encode() call

    
  

 
  

 
  
  

    
      

      
JSON → Go

      
Reverse — generate Go structs with json tags from any JSON sample.

      
1,480 searches/month

    
    
      

      
JSON → TypeScript

      
Generate TypeScript interfaces for the front-end consuming your Go API.

      
14,470 searches/month

    
    
      

      
JSON Viewer

      
Inspect the mock JSON in an interactive tree before using it in tests.

      
13,280 searches/month

    
  

 
  
  

    
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Go parsed in your
browser. No compiler needed.

      
The mock JSON mode uses a field-level regex parser — no need to compile Go. It reads struct field names and types, and generates realistic JSON values. The snippets and framework patterns are generated from your selection — no API call, no server round-trip.

    

    

      
Struct parser
Reads Go struct field names and types — handles json tags for key names and pointer types for nullable fields.

      
Marshal vs Encoder
Both patterns covered — json.Marshal for byte slices and strings, json.NewEncoder for writers (HTTP, files).

      
3 frameworks
net/http, Gin and Echo — the three most popular Go web frameworks, each with their idiomatic JSON response pattern.

      
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 convert a Go struct to JSON?

      
Use json.Marshal: data, err := json.Marshal(myStruct); if err != nil { log.Fatal(err) }. This returns a []byte. Convert to string with string(data). For pretty output: json.MarshalIndent(myStruct, "", "  "). Select the Snippets mode for the complete pattern with error handling.

    

    

      
How do I return JSON from a Go HTTP handler?

      
Set the Content-Type header, then use json.NewEncoder: w.Header().Set("Content-Type", "application/json"); if err := json.NewEncoder(w).Encode(data); err != nil { http.Error(w, err.Error(), 500) }. In Gin: c.JSON(200, data). In Echo: return c.JSON(200, data). Select the Frameworks mode for complete handler examples.

    

    

      
What is the difference between json.Marshal and json.NewEncoder?

      
json.Marshal encodes to []byte in memory — use when you need JSON as a variable, for Redis/cache, or string conversion. json.NewEncoder writes directly to an io.Writer without a temporary buffer — more efficient for HTTP responses and file output, especially for large payloads.

    

  

 


				
	
		
	


			
		
				
	

	
		
		



 

	
	

	
	
	
	
			
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