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# flat-cache > A stupidly simple key/value storage using files to persist the data [](https://npmjs.org/package/flat-cache) [](https://github.com/jaredwray/flat-cache/actions/workflows/tests.yaml) [](https://codecov.io/github/jaredwray/flat-cache) [](https://npmjs.com/package/flat-cache) ## install ```bash npm i --save flat-cache ``` ## Usage ```js var flatCache = require('flat-cache') // loads the cache, if one does not exists for the given // Id a new one will be prepared to be created var cache = flatCache.load('cacheId'); // sets a key on the cache cache.setKey('key', { foo: 'var' }); // get a key from the cache cache.getKey('key') // { foo: 'var' } // fetch the entire persisted object cache.all() // { 'key': { foo: 'var' } } // remove a key cache.removeKey('key'); // removes a key from the cache // save it to disk cache.save(); // very important, if you don't save no changes will be persisted. // cache.save( true /* noPrune */) // can be used to prevent the removal of non visited keys // loads the cache from a given directory, if one does // not exists for the given Id a new one will be prepared to be created var cache = flatCache.load('cacheId', path.resolve('./path/to/folder')); // The following methods are useful to clear the cache // delete a given cache flatCache.clearCacheById('cacheId') // removes the cacheId document if one exists. // delete all cache flatCache.clearAll(); // remove the cache directory ``` ## Motivation for this module I needed a super simple and dumb **in-memory cache** with optional disk persistance in order to make a script that will beutify files with `esformatter` only execute on the files that were changed since the last run. To make that possible we need to store the `fileSize` and `modificationTime` of the files. So a simple `key/value` storage was needed and Bam! this module was born. ## Important notes - If no directory is especified when the `load` method is called, a folder named `.cache` will be created inside the module directory when `cache.save` is called. If you're committing your `node_modules` to any vcs, you might want to ignore the default `.cache` folder, or specify a custom directory. - The values set on the keys of the cache should be `stringify-able` ones, meaning no circular references - All the changes to the cache state are done to memory - I could have used a timer or `Object.observe` to deliver the changes to disk, but I wanted to keep this module intentionally dumb and simple - Non visited keys are removed when `cache.save()` is called. If this is not desired, you can pass `true` to the save call like: `cache.save( true /* noPrune */ )`. ## License MIT ## Changelog [changelog](./changelog.md)
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