How to open a JSON file online
Three steps, a few seconds, no software.
Open your .PRO file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .PRO 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 .PRO file?
The most common data format on the web.
A .pro file is a generic extension with no single meaning. Qt qmake project files, PTC Pro/ENGINEER (Creo) files, older KiCad projects, Prolog source, and TurboFloorPlan projects all use it. Open the file in a text editor first to identify which program created it, then open it in that program. The most common technical .pro is a Qt project file; open it in Qt Creator.
Programs that open .PRO files
| Full name | Qt qmake Project File (.pro) |
|---|---|
| Developer | The Qt Company (Qt framework); .pro is also a generic extension used by many programs |
| First released | Qt / qmake, early 2000s |
| Category | Text & Code |
| MIME type | text/plain |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .PRO file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .PRO 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.
Was this tool helpful?
Your rating helps us decide which tools to improve next.