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Low level etcd v2 & v3 client written in Javascript with failover support

npm install etcdjs


Pass a connection string

var etcdjs = require('etcdjs')
var store = etcdjs('')
store.set('hello', 'world', function(err, result) {
  store.get('hello', function(err, result) {
    console.log('hello:', result.node.value)

If you have more than run instance of etcd running you can pass an array to load balance

var store = etcdjs(['', '', ''])

If you have a discovery token from you can also pass that

var store = etcdjs('')

etcdjs will automatically refresh its internal host list every 30s so you can transparently add more machines to your cluster without updating your seed host list.


store = etcd(host, opts)

host should be a etcd host (or an array of hosts) and opts default to

  refresh: false,        // refresh the interval host list automatically 
  timeout: 60 * 1000,    // default timeout for ops 
  json: false            // stringify/parse all values as JSON 

Note: The refresh option will try to discover additional etcd hosts via the etcd /machines endpoint which may not always return hostnames which are routable. Make sure the endpoint returns what you expect before turning on this feature.

store.get(key, [opts], cb)

Get a key. opts defaults to

  recursive: false,
  sorted: false,
  json: false,      // parse value as JSON for this request 
  wait: false,
  waitIndex: (none)

store.set(key, value, [opts], [cb])

Set a key. opts defaults to

  ttl: (none),
  dir: false,
  json: false,      // stringify value as JSON for this request 
  prevExist: (none),
  prevValue: (none),
  prevIndex: (none)

store.update(key, value, [opts], [cb])

Set a key if it already exists. Same as set(key, value, {prevExists: true})

store.del(key, [opts], [cb])

Delete a key. opts defaults to

  recursive: false,
  dir: false,
  prevExist: (none),
  prevValue: (none),
  prevIndex: (none)

store.mkdir(key, [opts], [cb])

Create a directory. Same as set(key, null, {dir: true})

store.rmdir(key, [opts], [cb])

Remove a directory. Same as del(key, {dir: true})

store.wait(key, [opts], [cb])

Wait a key to change. Same as get(key, {wait: true}) except the callback is called with a third argument next that will wait for the next change.

store.wait('hello', function onchange (err, result, next) {
  console.log('change!', result);
  next(onchange); // next will set waitIndex so we do not miss events 

.wait returns a destroy function which can be used to kill a waiting request.

var destroy = store.wait('hello', function onchange (err, result, next) {
  // ... do stuff .. 
store.set('key', 'value') // won't trigger the wait 

store.compareAndSwap(key, value, prevValue, [opts], [cb])

Only set if prevValue matches previous value. Similar to set(key, value, {prevValue: prevValue})

store.compareAndDelete(key, prevValue, [opts], [cb])

Only delete if prevValue matches previous value. Similar to del(key, value, {prevValue: prevValue})

store.push(key, value, [opts], [cb])

Create an in-order key that is guaranteed to be greater than the previous push. Check result.key to see the actual key.


Returns an array of all machines in the cluster


Returns the leader of the cluster


Destroy the client and all open connections


store.stats.self([node], cb)

Returns node stats

Returns store stats


Returns leader stats