How do I view a large JSON file?

Open it here with Open file, or drag it onto the page. The tree shows the structure without expanding everything, and Find jumps to keys, values or a path.

How do I view large JSON files on a Mac?

Open this page in Safari, Chrome or another current browser and choose Open file (⌘O). Nothing needs to be installed.

How do I open a large JSON file on Windows?

Open this page in Edge or Chrome and choose Open file (Ctrl+O). The file is read on your computer and is not uploaded.

Is there a size limit?

The page accepts files up to 300 MB. How large a file opens smoothly depends on your device memory and on the shape of the data.

Large JSON file viewer that runs in your browser

How to use this tool

Choose Open file (Ctrl+O, or ⌘O on a Mac), or drag the file onto the page.
When the status bar reports the parse, browse the Tree, or switch to Table for an array of records.
Press Ctrl+F (⌘F) to search, or type a path such as $.users[1] in the find bar to jump to a node.

Worked example

A small sample stands in for your file here. Open your own file to see its size, line count and node count in the status bar.

Input

{"users":[{"id":1,"name":"Ada","role":"admin"},{"id":2,"name":"Lin","role":"editor"}]}

Output

{
  "users": [
    {
      "id": 1,
      "name": "Ada",
      "role": "admin"
    },
    {
      "id": 2,
      "name": "Lin",
      "role": "editor"
    }
  ]
}

A measured example

We opened a 52.4 MB file (52,428,028 bytes) holding 51,501 records, each a small object with a 996-character string, in Chromium 154 on desktop Linux. Parsing took about 1.0 second, and the tree was ready about 1.9 seconds after the file was chosen. The document had 154,505 nodes.

That file is shallow and mostly text. Deeply nested data, many small numbers, an older laptop or a phone can take longer, so treat these numbers as one reference point rather than a guarantee.

Options and edge cases

Files up to 300 MB are accepted. That is a safety limit rather than a promise: what opens comfortably depends on the device memory and the shape of the data.
Above 2,000,000 characters or 30,000 lines the input becomes read-only so the views stay fast. Edit anyway turns editing back on.
Parsing runs on the main thread, so the page pauses while a very large file is read.
Documents over 2,500,000 characters are not saved for your next visit; open the file again instead.
Only the rows on screen are drawn in the editor, tree, table and text views, so scrolling stays smooth once the file is open.

Private by default

Your document stays in this browser. Tool Kumar parses, converts and creates downloads on your device, with no account or upload step.

Large JSON file viewer questions

How do I view a large JSON file?: Open it here with Open file, or drag it onto the page. The tree shows the structure without expanding everything, and Find jumps to keys, values or a path.
How do I view large JSON files on a Mac?: Open this page in Safari, Chrome or another current browser and choose Open file (⌘O). Nothing needs to be installed.
How do I open a large JSON file on Windows?: Open this page in Edge or Chrome and choose Open file (Ctrl+O). The file is read on your computer and is not uploaded.
Is there a size limit?: The page accepts files up to 300 MB. How large a file opens smoothly depends on your device memory and on the shape of the data.