JSON Viewer for Testing

About This Tool

Quality assurance engineers and test automation specialists work extensively with JSON data — API test payloads, response assertions, mock data fixtures, and test configuration files. This JSON Viewer for Testing addresses the specific needs of testing workflows: formatting expected vs actual responses for comparison, validating API response structures against schemas, preparing fixture data for automated test suites, and inspecting test output for debugging failures. The tool is particularly useful during exploratory testing sessions where you need to quickly inspect and format data without switching to a development environment. For API testing with tools like Postman, RestAssured, or Cypress, having a quick JSON processing tool accessible in the browser saves significant time during test development and debugging.

What is JSON Viewer?

A JSON viewer provides a detailed structural analysis of JSON data, displaying every path from root to leaf nodes with the corresponding value and data type. Unlike a simple formatter that only adds indentation, a viewer deconstructs the JSON into a flat path representation (like $.users[0].name) that makes it easy to identify specific values within deeply nested structures. This is invaluable for understanding complex API responses, navigating large configuration objects, and building queries or transformations that target specific data paths. The viewer shows object key counts, array lengths, value types (string, number, boolean, null), and the full dot-notation path to every element.

How to Use This Tool

1. Paste your JSON.
2. Click Inspect JSON.
3. Browse paths, values, and types.
4. Use paths to reference data in your code.

Common Use Cases

• Formatting JSON test fixtures and mock data
• Validating API response payloads in test scenarios
• Comparing expected vs actual JSON output
• Preparing JSON request bodies for API testing

Examples

{"users":[{"name":"Alice","roles":["admin","editor"]},{"name":"Bob","roles":["viewer"]}]}

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