JSON Viewer Online
View JSON as a collapsible tree and formatted text so nested API responses, configs, and logs are easier to inspect.
JSON viewer vs JSON formatter
A formatter makes JSON readable with indentation. A JSON viewer also helps you inspect structure, keys, arrays, and deeply nested values. This matters when an API response is valid but difficult to scan. A formatted block is useful for copying, while a tree view is better for understanding how objects and arrays fit together.
Use it for API debugging
Paste a sample response, open nested objects, and compare the fields you expected with the fields actually returned. For large logs, trim the sample to the relevant object before viewing. If the response contains a list of records, expand the first item and check whether every item uses the same shape. Inconsistent keys can explain frontend bugs, failed imports, and confusing empty states.
When an API call fails, start by confirming the JSON parses correctly. Then check the field names, value types, and nested arrays. A value that looks like a number but arrives as a string can break filters, charts, and calculations. A missing object can also matter more than an empty value, especially when application code expects a complete path.
Common JSON viewer workflows
Developers use a JSON viewer for webhook payloads, saved configuration files, browser storage exports, analytics events, translation files, mock API responses, and decoded token payloads. Support teams can also use it to inspect a sanitized example from a customer report before sending it to engineering.
If you need to compare two responses, format both samples first and then use a diff tool. If you need to inspect a token, decode it with the JWT Decoder and then view the payload as JSON. Keeping each step separate makes the debugging process easier to explain in a ticket.
Privacy note
The viewer runs locally after the page loads, but you should still remove access tokens, private user data, customer IDs, production secrets, and internal URLs before copying examples into tickets or documents. Local processing protects the paste action, but it does not protect screenshots, clipboard history, shared documents, or chat messages that you create afterward.
FAQ
What is a JSON viewer?
A JSON viewer displays JSON in a readable tree so you can inspect objects, arrays, and values.
Can this fix invalid JSON?
It validates JSON and shows parser errors, but you still need to correct the source text.
Is this different from JSON Formatter?
Yes. The formatter focuses on clean indentation, while this page also provides a tree view.
Related tools
How to read and view a JSON file
To read a JSON file, paste the content into the viewer above or drag a .json file onto the input area. The viewer formats the raw JSON with proper indentation, syntax highlighting, and collapsible nodes so you can navigate nested objects and arrays easily.
For editing, switch to the editor mode and modify values directly � the tool validates syntax in real time. For converting JSON to other formats, use the JSON to CSV or JSON to XLSX converters. Read the JSON guide for format explanation and common use cases.