Top 10 JSON Tools Every Developer Should Use in 2025

1. Online JSON Viewer & Formatter

An online JSON viewer is the fastest way to inspect and format JSON without installing anything. JSONViewerTool.com lets you paste JSON, switch between tree and code views, validate syntax and download results.

2. JSON → CSV Converter

When you need JSON data in Excel or Sheets, a JSON → CSV converter is essential. It turns arrays of objects into rows and columns for analysis.

3. CSV → JSON Converter

If you receive CSV files from business teams but need JSON for APIs, the CSV → JSON Converter can generate clean JSON objects from tabular data.

4. JSON ↔ YAML Converters

DevOps workflows often use YAML for Kubernetes, Docker and CI tools. Converters like JSON → YAML and YAML → JSON let you move seamlessly between formats.

5. JWT Decoder

For authentication, JWT tokens are everywhere. A safe, client-side JWT decoder lets you inspect headers and payloads without sending tokens to a remote backend.

6. Browser DevTools JSON viewers

Chrome, Edge and Firefox DevTools can pretty-print JSON in the Network tab. This is handy when you are already inspecting API responses.

7. IDE JSON plugins

VS Code, IntelliJ IDEA and other IDEs provide JSON syntax highlighting, validation and formatting. Extensions can also handle JSON schemas and autocomplete.

8. Command-line JSON processors

For automation and scripting, command-line tools like jq let you query, filter and transform JSON directly in the terminal.

9. JSON schema validators

If you need to enforce a strict structure for JSON payloads, JSON Schema and validators can ensure incoming data matches expectations.

10. API clients with JSON support

Tools like Postman and Hoppscotch provide rich JSON views out of the box. Combine them with a dedicated online viewer for a complete workflow.

Combine these tools with JSONViewerTool.com to cover everything from quick tests to deep debugging and data conversion.