CODEWITHSUNDEEP
javaspringjackson
eugene p
eugene p

Reputation: 7

Json string not formatted in browser but formatted in console

I am trying to output object serialized to json like this

@GetMapping("/person")
public String getPerson() throws JsonProcessingException {
    mapper.enable(SerializationFeature.INDENT_OUTPUT);
    System.out.println(mapper.writeValueAsString(person)); //just for debug
    return mapper.writeValueAsString(person);
}

I get what I wish in console:

{
  "name" : "person",
  "age" : 29,
  "listSkills" : [ "s1", "s2", "s3" ],
  "id" : 1,
  "hashCode" : 2145420209
}

but in browser it is printed in one line and just gets different font

{ "name" : "person", "age" : 29, "listSkills" : [ "s1", "s2", "s3" ], "id" : 1, "hashCode" : 2145420209 }

Upvotes: 0

Views: 1226

Answers (3)

xerx593
xerx593

Reputation: 13281

Problems

  1. You expect browser to have the same font(and colors) as console!? (Your expectations "base on wrong assumptions"/you must care)
  2. You don't use @[Rest]Controller as intended/documented.
  3. Obviously ResponseBody<String> (which you in fact return) doesn't behave as expected regarding white space.

Solution

  1. Spring-boot-starter-web [x]

  2. application.properties:

    spring.jackson.serialization.indent_output=true

  3. Impl:

    • Person: 
      package com.example.webtest;
import java.time.LocalDate;

public class Person {
   private String name;
   private LocalDate date;
   // default constructor (implicit)
   // getters, setters:
   public String getName() {
     return name;
   }
   public Person setName(String name) {
     this.name = name;
     return this; // fluent api (not mandatory...)
   }
   public LocalDate getDate() {
     return date;
   }
   public Person setDate(LocalDate date) {
     this.date = date;
     return this;
   }
}
    • Application + Controller: 
      package com.example.webtest;

import java.time.LocalDate;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
public class WebTestApplication {

   public static void main(String[] args) {
     SpringApplication.run(WebTestApplication.class, args);
   }

   @RestController
   static class SomeController {

     @GetMapping("/hello")
     public Person hello() { // Person! not String ;)
       return new Person().setName("Joe").setDate(LocalDate.now());
     }
   }
}

  4. Test (spring-boot:run,..browser) at http://localhost:8080/hello:

    enter image description here

Key points

  • Using spring-boot "jacksonObjectMapper" (auto & properties config).
  • Returning the desired type and not a String.

Upvotes: 1

BlackPearl
BlackPearl

Reputation: 300

In Spring boot, the GET method will produce result with content type of application/json by default.

If you want a formatted string in browsers, set produces to text/plain, aka

@GetMapping(value = "/person", produces = MediaType.TEXT_PLAIN_VALUE)

Upvotes: 0

Bartzilla
Bartzilla

Reputation: 2794

You can install a json formatter for your browser e.g. for Chrome this one is quite popular: JSON Formatter or you can find a similar one for your browser of choice.

Usually they come with great features such as sintax highlighting, clickable urls, toggles and some more.

Upvotes: 0

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