multiple column copy format postgresql Node.js - node.js

Question

I using postgres stream to insert record into postgres ,
for single column works fine , but what is ideal data format for copy for multiple columns
code snippets
var sqlcopysyntax = 'COPY srt (starttime, endtime) FROM STDIN delimiters E\'\\t\'';
var stream = client.query(copyFrom(sqlcopysyntax));
console.log(sqlcopysyntax)
var interndataset = [
['1', '4'],
['6', '12.074'],
['13.138', '16.183'],
['17.226', '21.605'],
['22.606', '24.733'],
['24.816', '27.027'],
['31.657', '33.617'],
['34.66', '37.204'],
['37.287', '38.58'],
['39.456', '43.669'],
['43.752', '47.297'],
['47.381', '49.55'],
];
var started = false;
var internmap = through2.obj(function(arr, enc, cb) {
/* updated this part by solution provided by #VaoTsun */
var rowText = arr.map(function(item) { return (item.join('\t') + '\n') }).join('')
started = true;
//console.log(rowText)
rowText=rowText+'\\\.';
/* end here*/
started = true;
cb(null, rowText);
})
internmap.write(interndataset);
internmap.end();
internmap.pipe(stream);
wherein i got error: (due to delimiter)missing data for column "endtime"(resolved) but got below error
error: end-of-copy marker corrupt
COPY intern (starttime, endtime) FROM STDIN
1 4
6 12.074
13.138 16.183
17.226 21.605
22.606 24.733
24.816 27.027
31.657 33.617
34.66 37.204
37.287 38.58
39.456 43.669
43.752 47.297
47.381 49.55
any pointer on how to resolve this .
what would be ideal format for multiple column inserts using copy command

Answer 1

With immense help from #jeromew from github community.
and proper implementation of node-pg-copy-streams(takes away copy command complexity ). we were able to solve this issue
https://github.com/brianc/node-pg-copy-streams/issues/65
below is working code snippets
var sqlcopysyntax = 'COPY srt (starttime, endtime) FROM STDIN ;
var stream = client.query(copyFrom(sqlcopysyntax));
console.log(sqlcopysyntax)
var interndataset = [
['1', '4'],
['6', '12.074'],
['13.138', '16.183'],
['17.226', '21.605'],
['22.606', '24.733'],
['24.816', '27.027'],
['31.657', '33.617'],
['34.66', '37.204'],
['37.287', '38.58'],
['39.456', '43.669'],
['43.752', '47.297'],
['47.381', '49.55'],
];
var started = false;
var internmap = through2.obj(function(arr, enc, cb) {
var rowText = (started ? '\n' : '') + arr.join('\t');
started = true;
cb(null, rowText);
})
data.forEach(function(r) {
internmap.write(r);
})
internmap.end();
internmap.pipe(stream);

Answer 2

https://www.postgresql.org/docs/current/static/sql-copy.html
DELIMITER
Specifies the character that separates columns within each row (line)
of the file. The default is a tab character in text format, a comma in
CSV format. This must be a single one-byte character. This option is
not allowed when using binary format.
try using not default delimiter (as tabulation can be replaced on copy/paste), eg:
t=# create table intern(starttime float,endtime float);
CREATE TABLE
t=# \! cat 1
COPY intern(starttime,endtime) FROM STDIN delimiter ';';
1;4
6;12.074
13.138;16.183
17.226;21.605
22.606;24.733
24.816;27.027
31.657;33.617
34.66;37.204
37.287;38.58
39.456;43.669
43.752;47.297
47.381;49.55
49.633;54.68
54.763;58.225
59.142;62.98
64.189;68.861
69.82;71.613
72.364;76.201
76.285;78.787
78.871;81.832
\.
t=# \i 1
COPY 20
Also in your question you lack \., try typing in psql - you will see instructions:
t=# COPY intern(starttime,endtime) FROM STDIN delimiter ';';
Enter data to be copied followed by a newline.
End with a backslash and a period on a line by itself.
End with a backslash and a period on a line by itself.