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i tried to pass a data from js file(sample.js) to ejs using res.send("filename.ejs",data) by converting a object into JSON where JSON data is displaying on console, but while trying to pass it showing an error

TypeError: Cannot create property '_locals' on string

can some one help with this and tell me how to call them in ejs file

res.send() is used for send data there is no need to point ejs file

res.send takes array as parameter (res.send([body])) and you can get it in ejs like data

for example

NODEJS
res.send(message: 'hello')

filename.ejs

<div> message </div> or <%= JSON.stringify(message) %>

also as Express 5x does not support res.send() method you can use

res.status(200).send(message: 'hello)

(you did not admit you express version)

Note that you should not use the .ejs extension in res.render, despite other answers to your question suggesting that you do so.

When you call res.render('myView'), ejs looks for a template called myView.ejs in a folder called views (which is set as the default folder to use by ejs)

for example:

res.render('myView.ejs',
 data:data,
 foo:'foo'
);

ejs will look for a view called myView.ejs.ejs (or it might just fail alltogether).

To access the data on your template, you would do the following:

app.js:

app.get('/somePathHere', function(req, res) 
 res.render('myView',
 data:data,
 foo:'foo'
 );
);

myView.ejs:

<% data.forEach(function(item) %>
 //do something

<% ); %>

<%= foo %>

Note that when accessing a variable, you use the <%= varNameHere %>, and when writing any type of function, you would omit the =.

You're sending data to your view so update your code with this and try

 res.render("filename",
 data:"hello"
 );

Or you can pass whole data

 res.render("filename",data:data);

And in your ejs file access it like this

 <div> <%= data %> <div>