Format

Pretty print or minify JSON text

POST/v1/format/json

Pretty-prints JSON with the chosen indent, or minifies it. Key order and non-ASCII text are kept. Broken JSON answers 400 with the line, column and reason, so the caller can fix it.

Updated October 27, 2026

Request body

Name	Type	Required	Description
content	string	yes	The JSON text to format
style	one of: pretty, minify	no	pretty adds indentation, minify removes all optional whitespace (default `"pretty"`)
indent	integer	no	Spaces per level when the style is pretty (default `2`)

Example request

A request body that works, as JSON.

{
  "content": "{\"city\": \"Porto\", \"temp_c\": 18}",
  "style": "pretty",
  "indent": 4
}

Code samples

Replace YOUR_TOKEN with your access token.

curl

curl -X POST 'https://api.skillfulsardine.com/v1/format/json' \
  -H 'Authorization: Bearer YOUR_TOKEN' \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "content": "{\"city\": \"Porto\", \"temp_c\": 18}",
  "style": "pretty",
  "indent": 4
}'

PowerShell

$body = @'
{
  "content": "{\"city\": \"Porto\", \"temp_c\": 18}",
  "style": "pretty",
  "indent": 4
}
'@
$response = Invoke-RestMethod -Method Post -Uri 'https://api.skillfulsardine.com/v1/format/json' `
  -Headers @{ Authorization = 'Bearer YOUR_TOKEN' } `
  -ContentType 'application/json; charset=utf-8' `
  -Body ([System.Text.Encoding]::UTF8.GetBytes($body))
$response | ConvertTo-Json -Depth 10

Python

import requests

payload = {
    "content": "{\"city\": \"Porto\", \"temp_c\": 18}",
    "style": "pretty",
    "indent": 4,
}

response = requests.post(
    "https://api.skillfulsardine.com/v1/format/json",
    headers={"Authorization": "Bearer YOUR_TOKEN"},
    json=payload,
    timeout=30,
)
print(response.json())

JavaScript

const response = await fetch("https://api.skillfulsardine.com/v1/format/json", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_TOKEN",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
  "content": "{\"city\": \"Porto\", \"temp_c\": 18}",
  "style": "pretty",
  "indent": 4
}),
});
const result = await response.json();
console.log(result);

Node

// Node 18 or later. Save as call.mjs and run: API_TOKEN=... node call.mjs
const token = process.env.API_TOKEN;

const response = await fetch("https://api.skillfulsardine.com/v1/format/json", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${token}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
  "content": "{\"city\": \"Porto\", \"temp_c\": 18}",
  "style": "pretty",
  "indent": 4
}),
});
const result = await response.json();
console.log(result);

Rust

// Cargo.toml: reqwest = { version = "0.12", features = ["blocking", "json"] }, serde_json = "1"
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let body: serde_json::Value = serde_json::from_str(r#"{
  "content": "{\"city\": \"Porto\", \"temp_c\": 18}",
  "style": "pretty",
  "indent": 4
}"#)?;
    let response = reqwest::blocking::Client::new()
        .post("https://api.skillfulsardine.com/v1/format/json")
        .bearer_auth("YOUR_TOKEN")
        .json(&body)
        .send()?;
    println!("{}", response.text()?);
    Ok(())
}

Swift

import Foundation

var request = URLRequest(url: URL(string: "https://api.skillfulsardine.com/v1/format/json")!)
request.httpMethod = "POST"
request.setValue("Bearer YOUR_TOKEN", forHTTPHeaderField: "Authorization")
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = Data(#"""
{
  "content": "{\"city\": \"Porto\", \"temp_c\": 18}",
  "style": "pretty",
  "indent": 4
}
"""#.utf8)

let (data, _) = try await URLSession.shared.data(for: request)
print(String(decoding: data, as: UTF8.self))

Response

The fields inside data of a successful response.

Name	Type	Required	Description
formatted	string	yes	The JSON text after formatting, same data and same key order

Example response

A real answer from the operation, as JSON. The fields in the table above are inside data.

{
  "data": {
    "formatted": "{\n    \"city\": \"Porto\",\n    \"temp_c\": 18\n}"
  },
  "errors": null,
  "meta": {
    "request_id": "980ae5ea-bbad-485e-9fd0-185d908f2eb2",
    "timestamp": "2026-10-27T07:19:42.100789Z",
    "version": "2026-03-26"
  },
  "pagination": null
}

Responses

Status	When it happens
200	Successful Response
400	The body respects the operation schema, but the use case rejected it. Each problem is one ApiError entry
413	The request is larger than the request size limit of the API allows
422	The body does not respect the operation schema. Each problem is one ApiError entry with the code validation_error
500	Something failed inside the server and was not an input problem. The same envelope, errors may be empty