There are - as far as I know - three maintained validators available for STAC:
- The original Python validator
- The validation functionality shipped with PySTAC
- This Node/JavaScript validator
Additionally I found some tools that seem to be unmaintained: 1 2
Here I'd like to give an overview of what the validators are capable of and what they are missing so that you can make a well-informed choice.
| Python Validator | PySTAC | STAC Node Validator | |
|---|---|---|---|
| Validator Version | 1.0.1 | 0.5.2 | 1.3.1 |
| Language | Python 3.6 | Python 3 | NodeJS |
| CLI | Yes | No | Yes |
| Programmatic | Yes | Yes | Planned |
| Online | Yes, staclint.com | No | Planned |
| Protocols supported (Read) | HTTP(S), Filesystem | HTTP(S), Filesystem | HTTP(S), Filesystem |
| Gives | HTML / CLI / Python Output | Python Dict | CLI output |
| Python Validator | PySTAC | STAC Node Validator | |
|---|---|---|---|
| STAC Versions supported | >= 0.7.0 | >= 0.4.0 | >= 1.0.0-beta.1 |
| Protocols supported | HTTP(S), Filesystem | HTTP(S), Filesystem | HTTP(S), Filesystem |
| Validates Items / Catalogs / Collections | Yes | Yes | Yes |
| Validates Core Extensions | Yes | Yes | Yes |
| Validates External / Custom Extensions | No | No | Yes |
| Validates STAC API responses | No | No | Partially (only items/collections in lists) |
| Validates STAC API conformance classes | No | No | No |
| Python Validator | PySTAC | STAC Node Validator | |
|---|---|---|---|
| Can follow links | Yes | Yes | No |
| Parallelization | Yes | No | No |
| Validate against local schemas | Yes | Planned | Yes |
| Lint JSON files | No | No | Yes |
| Format/Pretty-print JSON files | No | Yes | Yes |
| Other comments | Uses PySTAC validation | General Python library to work with STAC catalogs | - |