How to Format JSON and Convert to YAML Online (100% Private Guide)

Quick Summary

To format JSON or convert it to YAML safely: Paste raw JSON into the OnlineViewer JSON Tool. Click Format (Alt+3) to beautify code with 2-space indentation, or click JSON to YAML (Alt+5) to convert data structures for Docker, Kubernetes, and OpenAPI definitions locally without sending bytes to external servers.

Why Privacy Matters When Formatting JSON

JSON (JavaScript Object Notation) is the standard data interchange format for REST APIs, GraphQL endpoints, and database payloads. However, JSON payloads often contain sensitive information like authentication tokens, private API keys, database connection strings, and personal user data.

When using conventional online JSON formatters, your payload is routinely transmitted over network servers, logging sensitive data into third-party analytics and backend servers. OnlineViewer Dev solves this by performing 100% of parsing and conversion inside your browser's V8 JavaScript engine memory.

Step-by-Step Guide to Formatting & Inspecting JSON

Step 1: Paste Your Raw JSON Code

Open the JSON Viewer tool and paste your stringified or minified JSON text into the left editor pane.

Step 2: Use Interactive Tree Mode

Click Tree Mode (or press Alt+1) to render a visual collapsible tree. You can click object nodes to expand or collapse deeply nested keys, and click individual key/value pairs to copy them directly to your clipboard.

// Sample JSON Data Structure
{
  "api_version": "v2.4",
  "status": "success",
  "data": {
    "user_id": 10492,
    "roles": ["admin", "developer"],
    "privacy": {
      "client_side_only": true,
      "server_logging": false
    }
  }
}
            

Step 3: Convert JSON to YAML

Need a configuration file for Kubernetes, Docker Compose, or GitHub Actions? Click JSON to YAML (or press Alt+5) to generate clean, indented YAML syntax instantly.

# Converted YAML Output
api_version: v2.4
status: success
data:
  user_id: 10492
  roles:
    - admin
    - developer
  privacy:
    client_side_only: true
    server_logging: false
            

How to Repair Escaped JSON Strings

Log files and backend stack traces often format JSON as escaped strings with backslashes (e.g. "{\"name\":\"admin\"}"). Use the Unescape button (or press Alt+2) in our JSON tool to strip escaped quotes and restore clean, parseable JSON instantly.

Summary Comparison: JSON vs YAML

Feature	JSON (JavaScript Object Notation)	YAML (YAML Ain't Markup Language)
Primary Use Case	API Payload Transmission, Web Services	DevOps Configs, Kubernetes, Docker, OpenAPI
Syntax Style	Brackets `{}` and Quotations `""`	Whitespace Indentation & Key-Value Pairs
Comment Support	No Standard Comments	Supports `#` Comments
Browser Native Parsing	Native `JSON.parse()` Engine	Requires Parser Library