Help: neo4j-driver example not working

[Mike Frederick]

Hello,

I am trying to get a basic JavaScript script in node.js (using version 8.11.3) to neo4j (Community Edition, version 3.3.5) query working using the neo4j-driver (version 1.6.2) package. I found the page on the neo4j website describing this and duplicated the logic in the following script:

const neo4j = require('neo4j-driver').v1;
const driver = neo4j.driver('http://localhost:7474', neo4j.auth.basic('admin', 'admin'));
const session = driver.session();
const resultPromise = session.run('match (f:Fact) RETURN f');
resultPromise.then(result => { var r = result; });

When this is executed, at line 5 I get:

(node:2904) UnhandledPromiseRejectionWarning: ReferenceError: Headers is not defined
    at createHttpHeaders (c:\projects\TRI-server\node_modules\neo4j-driver\lib\v1\internal\http\http-request-runner.js:181:17)
    at sendRequest (c:\projects\TRI-server\node_modules\neo4j-driver\lib\v1\internal\http\http-request-runner.js:162:16)
    at HttpRequestRunner.beginTransaction (c:\projects\TRI-server\node_modules\neo4j-driver\lib\v1\internal\http\http-request-runner.js:56:14)
    at HttpSession.run (c:\projects\TRI-server\node_modules\neo4j-driver\lib\v1\internal\http\http-session.js:80:34)
    at repl:1:31
    at ContextifyScript.Script.runInThisContext (vm.js:50:33)
    at REPLServer.defaultEval (repl.js:240:29)
    at bound (domain.js:301:14)
    at REPLServer.runBound [as eval] (domain.js:314:12)
    at REPLServer.onLine (repl.js:468:10)
(node:2904) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:2904) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Does anyone know what is wrong with this? Any help appreciated. 

[Benoît Simard]

Hi,

The driver is using the bolt protocol, not the http one.
So you just have to replace `http://localhost:7474` by
`bolt://localhost:7687` and it will work !

----

const neo4j = require('neo4j-driver').v1;

const driver = neo4j.driver('bolt://localhost:7687,

neo4j.auth.basic('admin', 'admin'));
const session = driver.session();
const resultPromise = session.run('match (f:Fact) RETURN f');
resultPromise.then(result => { var r = result; });

----

Cheers

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[Mike Frederick]

Thanks. I have replaced the http:// with bolt://

const neo4j = require('neo4j-driver').v1;

const driver = neo4j.driver('bolt://localhost:7474', neo4j.auth.basic('admin', 'admin'));

const session = driver.session();

const resultPromise = session.run('MATCH (f:Fact) RETURN f');

resultPromise

  .then(result => {

    session.close();

  })

  .catch(error => {

    console.log(error);

  });

and now I receive (copy of console when running the script interactively with the node command):

c:\projects\TRI-server>node

> const neo4j = require('neo4j-driver').v1;

undefined

> const driver = neo4j.driver('bolt://localhost:7474', neo4j.auth.basic('admin', 'admin'));

undefined

> const session = driver.session();

undefined

> const resultPromise = session.run('MATCH (f:Fact) RETURN f');

undefined

> resultPromise

Result {

  _stack: '\n    at captureStacktrace (c:\\projects\\TRI-server\\node_modules\\neo4j-driver\\lib\\v1\\result.js:200:15)\n    at new Result (c:\\projects\\TRI-server\\node_modules\\neo4j-driver\\lib\\v1\\result.js:73:19)\n    at Session._run (c:\\projects\\TRI-server\\node_modules\\neo4j-driver\\lib\\v1\\session.js:116:14)\n    at Session.run (c:\\projects\\TRI-server\\node_modules\\neo4j-driver\\lib\\v1\\session.js:95:19)\n    at repl:1:31\n    at ContextifyScript.Script.runInThisContext (vm.js:50:33)\n    at REPLServer.defaultEval (repl.js:240:29)\n    at bound (domain.js:301:14)\n    at REPLServer.runBound [as eval] (domain.js:314:12)\n    at REPLServer.onLine (repl.js:468:10)',

  _streamObserver:

   StreamObserver {

     _fieldKeys: null,

     _fieldLookup: null,

     _queuedRecords: [],

     _tail: null,

     _error: null,

     _hasFailed: false,

     _errorTransformer: [Function],

     _observer: null,

     _conn: null,

     _meta: {} },

  _p: null,

  _statement: 'MATCH (f:Fact) RETURN f',

  _parameters: {},

  _metaSupplier: [Function],

  _connectionHolder:

   ConnectionHolder {

     _mode: 'WRITE',

     _connectionProvider:

      DirectConnectionProvider {

        _hostPort: 'localhost:7474',

        _connectionPool: [Object],

        _driverOnErrorCallback: [Function: bound _driverOnErrorCallback] },

     _referenceCount: 1,

     _connectionPromise: Promise { [Object], domain: [Object] } } }

>   .then(result => {

Invalid REPL keyword

>     session.close();

undefined

>   })

...   .catch(error => {

...     console.log(error);

...   });

c:\projects\TRI-server>

So I still am not able to make a simple query. Anyone able to help?

[Benoît Simard]

You only have replaced the protocol but not the port !

You also have to replace 7474 by 7687, take a look at my example :)

Cheers.

[Mike Frederick]

Thank you. This along with a few more changes and I actually have some data coming through.