JSON Viewer Online

How to use the JSON Viewer

1. Paste your JSON into the input box above
2. Click View JSON
3. The tree view below shows every object and array as a collapsible node
4. Click any node to expand or collapse it

The tree view is especially useful for deeply nested API responses where scrolling through raw text is slow. You can collapse branches you don't need and focus on the parts of the structure that matter.

JSON Viewer vs JSON Formatter

A JSON formatter adds indentation and line breaks so raw JSON becomes readable text. A JSON viewer goes further — it renders the JSON as an interactive tree where you can expand and collapse individual nodes. Both tools are useful at different points of the same workflow:

• Use the viewer to navigate and understand a complex JSON structure
• Use the formatter when you need the formatted text to copy into code or share with a colleague
• Use the validator when you need to confirm the JSON is syntactically correct before sending it to an API

Worked example

Given this nested JSON:

{
  "user": {
    "name": "Alice",
    "roles": ["admin", "editor"]
  },
  "active": true
}

the viewer renders a tree you can expand and collapse. Conceptually it looks like this, with each object and array as its own toggle:

▾ {} root
  ▾ {} user
       name: "Alice"
     ▾ [] roles
          0: "admin"
          1: "editor"
    active: true

What to notice

• Each object ({}) and array ([]) is a collapsible node — click it to hide everything beneath and focus on the rest.
• Inside the roles array, the children are keyed by index (0, 1), so you can see each element's position as well as its value.
• Leaf values ("Alice", true) sit at the end of a branch with no toggle.

Edge cases & gotchas

• The tree is read-only. Expanding and collapsing never changes your data — edit the input box (or the JSON Formatter) if you need to change values, then view again.
• Arrays are indexed. Array children are labelled by numeric index rather than a key name, which makes "the third item" easy to locate in a long list of objects.
• Very large files render slower. Several-megabyte documents are fine; past roughly 10 MB the initial tree build can lag depending on your device, since every node becomes a DOM element.
• Duplicate keys show once. If the source object repeats a key, parsing keeps only the last value, so the tree displays a single node for it.
• Order is preserved as written. Object keys appear in the order they occur in your source, so the tree mirrors the document rather than sorting alphabetically.