How to open a JSON file online
Three steps, a few seconds, no software.
Open your .VDM file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .VDM 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 .VDM file?
The most common data format on the web.
A .vdm file is most likely a VDM-SL or VDM++ formal specification source file, a mathematical description of a software system used in safety-critical engineering. Open it with Overture Tool (free, overturetool.org). The extension is also used by the VEDIT text editor for macro scripts, and historically by Windows Defender for virus definition modules.
Programs that open .VDM files
| Full name | VDM Specification File |
|---|---|
| Developer | Originated at IBM Vienna Lab; maintained by IFAD/Terma/community; tooling by VDM Tools / Overture Project |
| First released | 1970s (VDM-SL); ISO/IEC 13817-1 published 1996 |
| Category | Text & Code |
| MIME type | text/plain |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .VDM file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .VDM 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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