How to open a JSON file online
Three steps, a few seconds, no software.
Open your .PRM file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .PRM 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 .PRM file?
The most common data format on the web.
A PRM file stores parameters or settings for the application that created it. There is no single PRM viewer. Open it with the program that made it, commonly GSAS for crystallography or Gurobi for optimization. Most PRM files are plain text, so a text editor lets you inspect the contents and identify the source.
Programs that open .PRM files
| Full name | Parameter File |
|---|---|
| Developer | Various (generic; no single vendor) — common in GSAS, Gurobi and other technical software |
| First released | N/A (generic extension reused by many programs over decades) |
| Category | Text & Code |
| MIME type | text/plain |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .PRM file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .PRM 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.