# crates-index
[](https://lib.rs/crates/crates-index)
Library for retrieving and interacting with the [crates.io registry git-based index](https://github.com/rust-lang/crates.io-index).
The index contains metadata for all Rust libraires and programs published on crates.io: their verisons, dependencies, and feature flags.
[Documentation](https://docs.rs/crates-index/)
## Example
```rust
let index = crates_index::Index::new_cargo_default()?;
for crate_releases in index.crates() {
let _ = crate_releases.most_recent_version(); // newest version
let crate_version = crate_releases.highest_version(); // max version by semver
println!("crate name: {}", crate_version.name());
println!("crate version: {}", crate_version.version());
}
```
## Migration from 0.18
It should work without any code changes. Only the `git2` and `toml` dependencies were updated.
## Migration from 0.16 and 0.17
* `BareIndex` and `BareIndexRepo` have become the `Index`.
* `Index::new_cargo_default()?` is the preferred way of accessing the index. Use `with_path()` to clone to a different directory.
* There's no need to call `retrieve()` or `exists()`. It's always retrieved and always exists.
* `retrieve_or_update()` is just `update()`.
* `highest_version()` returns crate metadata rather than just the version number. Call `highest_version().version().parse()` to get `semver::Version`.
* There's no `crate_index_paths()`, because there are no files any more. Use `crate_` to get individual crates.
## Similar crates
- [`crates_io_api`](https://github.com/theduke/crates_io_api)
## License
Licensed under version 2 of the Apache License