exists

Checks if the specified keys exist in the database.

[Redis documentation]


exists(keys, [options], callback)

Arguments Type Description
keys array List of keys to check for existence
options JSON Object Optional parameters
callback function Callback

Options

Option Type Description Default
queuable boolean Make this request queuable or not true

Callback Response

Returns an integer containing the number of existing keys amongst the provided list.

Usage

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// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.exists(['key1', 'key2', '...'], function (err, count) {
  // callback called once the action has completed
});

// Using promises (NodeJS only)
kuzzle.memoryStorage.existsPromise(['key1', 'key2', '...'])
  .then(count => {
    // resolved once the action has completed
  });

Callback response:

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