How to open a JSON file online
Three steps, a few seconds, no software.
Open your .ADS file
Drop it on the box, choose it from your device, or paste the data straight in.
View the structure
Your .ADS 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 .ADS file?
The most common data format on the web.
An ADS file is plain Ada source code, specifically the package specification (the public interface) written in the Ada programming language. Open it in any text editor or an Ada IDE like GNAT Studio or VS Code with the Ada extension. It is not executable on its own - compile the full Ada project with the GNAT toolchain to produce a binary.
Programs that open .ADS files
| Full name | Ada Package Specification (Source File) |
|---|---|
| Developer | Ada language (ISO/IEC 8652); GNAT convention by AdaCore/GNU |
| First released | 1980 (Ada language); .ads/.adb naming from GNAT (early 1990s) |
| Category | Text & Code |
| MIME type | text/x-ada |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .ADS file uploaded anywhere?
No. The file is opened directly from the copy you pick.
My .ADS 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.