JSON Viewer

JSON Viewer and Editor Online – View, Format, and Edit JSON

Use this free JSON viewer and editor to display JSON, inspect its structure, and make quick edits in your browser. Paste or load any JSON and the JSON online viewer will pretty-print and organize it into a readable, collapsible tree.

It’s perfect when you need a fast JSON view of API responses, config files, or logs and want a lightweight JSON editor online free instead of opening a full IDE.

What the JSON Viewer & Editor Does

The JSON viewer editor helps you:

• Pretty-print and format JSON with proper indentation.
• Navigate complex JSON structure online using a tree view.
• Edit values directly in the browser with instant feedback.
• Validate JSON syntax and highlight errors.

You can use it both as a JSON online viewer and as a JSON file editor online when you need to tweak values before sending them elsewhere.

How to Use the JSON Viewer Online

1. Open the JSON Viewer
   Visit JSON Viewer.
2. Paste or load JSON
   Paste your JSON string into the input panel or load a JSON file online if the tool supports file upload.
3. Format and display JSON
   Click the format or view button. The JSON editor viewer will render a tree-based JSON view with collapsible nodes.
4. Edit JSON online
   Click on keys or values to edit JSON file online. The tool will keep the structure valid as you adjust data.
5. Copy or export
   Once you’re satisfied, copy the updated JSON or download it for use in your app, tests, or documentation.

Why Use a JSON Viewer and Editor Online?

Understand Complex JSON Quickly

APIs often return deeply nested objects and arrays. The JSON viewer editor lets you expand just the parts you care about, making large payloads easier to understand at a glance.

Debug and Test API Responses

When an API call is failing, use the JSON online editor to inspect the payload, adjust values, and send updated JSON into your test environment.

Edit JSON Without Installing Software

If you’re away from your usual editor, this JSON editor online free gives you a quick way to format and update data in any browser.

Common Use Cases

• Inspecting REST API responses copied from a browser dev tools panel.
• Editing configuration files stored as JSON.
• Reviewing JSON structure with non-technical stakeholders.
• Fixing small syntax errors or value types before saving to disk.

Related JSON Tools on CodersTool

• JSON Formatter – Pretty-print and validate raw JSON text.
• JSON to XML Formatter – Convert JSON data into XML format.
• Convert JSON to PHP Array – Generate PHP arrays from JSON structures.
• JSON Tools Collection – See all JSON-related utilities available on CodersTool.