How to open a JSON file online
Three steps, a few seconds, no software.
Open your .MTX file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .MTX 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 .MTX file?
The most common data format on the web.
An MTX file is most commonly a Visual Studio manual test, a structured list of steps and expected results that a human tester follows inside Visual Studio's testing tools. Open it by loading the containing test project in Visual Studio. If your file looks like rows of numbers it is probably a Matrix Market sparse-matrix data file, not a test.
Programs that open .MTX files
| Full name | Visual Studio Manual Test File |
|---|---|
| Developer | Microsoft Corporation |
| First released | Mid-2000s, with Visual Studio Team System / Team Test (Visual Studio 2005+) |
| Category | Text & Code |
| MIME type | text/plain |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .MTX file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .MTX 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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