How to open a JSON file online
Three steps, a few seconds, no software.
Open your .XST file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .XST file opens as a tidy, foldable tree, with the exact line of any error pointed out.
Search, copy or download
Search keys and values, copy any path or value, switch to a table, or download a clean copy.
What is a .XST file?
The most common data format on the web.
An XST file is an internal template file created automatically by Microsoft Outlook when setting up an email profile. It belongs to the same binary file family as PST and OST files but holds only folder structure stubs, not actual emails. You cannot open it to read messages; your mailbox data is in the associated PST or OST file.
Programs that open .XST files
| Full name | Microsoft Outlook Offline Template File |
|---|---|
| Developer | Microsoft Corporation |
| First released | circa 1997 (Outlook 97 era) |
| Category | Text & Code |
| MIME type | application/octet-stream |
| Signature | 21 42 44 4E "!BDN" - Outlook offline data header (same family as PST/OST) |
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Frequently asked questions
Is my .XST file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .XST file is invalid. Can you fix it?
We show the exact line and column of the first error. For common problems like comments, trailing commas, single quotes or Python-style True/False/None, click Try to repair and download the fixed file.
How large can the file be?
Up to 50 MB. The tree only builds the branches you open, so even multi-megabyte files stay responsive.
What is JSONPath?
A path like $.orders[3].customer.email that points to one value inside the data. Click any node to see its path and copy it for code, jq or your API docs.
Can I see my data as a table?
Yes. Any array of objects can be shown in the Table view and downloaded as CSV.
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