MARC record Node.js library
Install the module with: npm install marcjs
const { Marc, Record } = require('marcjs');
let record = new Record();
record.append(['245', ' 1', 'a', 'Middlemarch /', 'b', 'Georges Eliot.']);
console.log(record.as('Text'));
console.log(Marc.format(record, 'Marcxml'));This script reads an ISO2709 file, adds a field to each record, and writes each record into an ISO2709 file, a MARCXML file, a JSON file, and a text file.
const { Marc } = require('marcjs');
const fs = require('fs');
let reader = Marc.stream(fs.createReadStream('bib.mrc'), 'Iso2709');
let writers = ['marcxml', 'iso2709', 'json', 'text']
.map(type => Marc.stream(fs.createWriteStream('bib-edited.'+type),type));
let trans = Marc.transform(record => {
record.fields = record.fields.filter((field) => field[0][0] !== '6' && field[0][0] !== '8' );
record.append( [ '801', ' ', 'a', 'Tamil s.a.r.l.', 'b', '2021-01-01' ] );
});
reader.on('data', (record) => {
trans.write(record);
record = trans.read(record);
writers.forEach((writer) => writer.write(record) );
});
var tick = setInterval(() => { console.log(reader.count); }, 100);
reader.on('end', () => {
writers.forEach(writer => writer.end());
console.log("Number of processed biblio records: " + reader.count);
clearInterval(tick);
});Same but using pipe():
const { Marc } = require('marcjs');
const fs = require('fs');
let reader = Marc.stream(fs.createReadStream('BNF-Livres-01.mrc'), 'Iso2709');
let trans = Marc.transform((record) => {
// Delete 9.. tags and add a 801 field
record.fields = record.fields.filter((field) => field[0][0] !== '9');
record.append( [ '801', ' ', 'a', 'Tamil s.a.r.l.', 'b', '2021-01-01' ] );
});
const transStream = reader.pipe(trans);
// Pipe the stream of transformed biblio record to 4 different writers
['marcxml', 'iso2709', 'json', 'text'].forEach((type) => {
const writer = Marc.stream(fs.createWriteStream(`bib-edited.${type}`), type);
transStream.pipe(writer);
});
var tick = setInterval(() => { console.log(reader.count); }, 100);
reader.on('end', () => {
console.log("Number of processed biblio records: " + reader.count);
clearInterval(tick);
});The Marc object has two properties:
- parser
- formater
Marc has three functions:
- stream()
- parse()
- transform()
The class has two properties defining the serialization formats that MARC module is able to read and write.
- parser -- The serialization format that MARC can read: Iso2709, Marcxml, and MiJ (MARC-in-JSON).
- formater --The serialisation format that MARC can write: Iso2709, Marcxml, MiJ, Text, Json.
const knownParser = Object.keys(Marc.parser);
console.log(knownParser); // Display Marc format that marcjs can parseReturns a readable/writable/duplex stream for specific serialisation format. The
stream has a property count containing the number of record written/readen.
- text -- Writable.
- iso2709 -- Readable/Writable.
- marcxml -- Readable/Writable.
- json -- Writable.
- mij -- Readable/Writable.
Usage:
const iso2709Reader = Marc.stream(process.stdin, 'Iso2709');
const marcxmlReader = Marc.stream(fs.createReadStream(file), 'Marcxml');
const textWriter = Marc.stream(fs.stdout, 'Text'); Read an ISO2709 file and display its text version to the screen:
const { Marc } = require('marcjs');
const reader = Marc.stream(fs.createReadStream('bib.mrc', 'Iso2709'));
const writer = Marc.stream(fs.stdout, 'Text');
reader.pipe(writer);One-liner version:
const { Marc } = require('marcjs');
Marc
.stream(fs.createReadStream('bib.mrc', 'Iso2709'))
.pipe(Marc.stream(fs.stdout, 'Text'));Version with marcjs Readable/Writable/Duplex Node.js classes:
const { Iso2709, Text } = require('marcjs');
const reader = new Iso2709(fs.createReadStream('bib.mrc'));
const writer = new Text(fs.stdout, 'Text');
reader.pipe(writer);Parse a raw record serialized in type format, and returns a MARC record.
For example:
const { Marc } = require('marcjs');
const marcxml = `<record>
<leader>01288nam 2200337 450 </leader>
<controlfield tag="001">FRBNF345958660000005</controlfield>
<datafield tag="200" ind1="1" ind2=" ">
<subfield code="a">Histoire religieuse du Maine</subfield>
<subfield code="b">Texte imprimé</subfield>
</datafield>
</record>`;
const record = Marc.parse(marcxml, 'marcxml');Format record with type serialization format. Note that:
For example:
const { Marc } = require('marcjs);
// Get a MARC record
console.log(Marc.format(record, 'Text'));
console.log(Marc.format(record, 'Marcxml'));Returns a Transform stream transforming a MARC record. It allows chaining reading, multiple transformation, writing, via piping streams.
Example:
const deleteSomeFields = Marc.transform((record) => {
record.delete('8..');
record.delete('6..');
});
... get a record
record = deleteSomeFields(record);The Record object has two attributes :
- leader
- fields
And Record has several methods:
- append()
- as()
- get()
- match()
- delete()
- clone()
- mij()
The library manipulates MARC biblio records as native Javascript objects which
have two attributes: leader and fields. Each record is a Record object.
Example:
{
"leader": "01243nam 22002173n 450 ",
"fields": [
[
"001",
"FRBNF323046990000009"
],
[
"009",
"http://catalogue.bnf.fr/ark:/12148/cb32304699p"
],
[
"035",
" ",
"a",
"SAFIG04210003-01"
],
[
"039",
" ",
"o",
"CRI",
"a",
"SU063312260001S "
],
[
"100",
" ",
"a",
"19970701d1927 m y0frey0103 ba"
],
[
"101",
"0 ",
"a",
"eng"
],
[
"102",
" ",
"a",
"GB"
],
[
"105",
" ",
"a",
"||||z 00|||"
],
[
"106",
" ",
"a",
"r"
],
[
"200",
"1 ",
"a",
"Greek printing types",
"b",
"Texte imprimé",
"e",
", 1465-1927, facsimiles from an exhibition of books illustrating the development of Greek printing shown in the British Museum, 1927. With an historical introduction by Victor Scholderer. [Preface by Frederic G. Kenyon.]"
],
[
"210",
" ",
"a",
"London, British Museum ; B. Quaritch ; H. Milford",
"a",
"(Oxford, printed by J. Johnson)",
"d",
"1927. Gr. in-fol. (390 x 265), 23 p., fac-sim. [Don 217025] -Ia-"
],
[
"300",
" ",
"a",
"On a joint des comptes rendus extraits du ¸Times Lit. Suppl.¸, 25 August. 1927 et du ¸Library association record¸, 1927, et ¸La première Renaissance des études grecques en France, hellénistes et imprimeurs¸, par Egger, extrait de la ¸Revue de Paris¸, 15 décembre 1868"
],
[
"702",
" |",
"3",
"12331862",
"a",
"Kenyon",
"b",
"Frederic George",
"f",
"1863-1952",
"4",
"080"
],
[
"801",
" 0",
"a",
"FR",
"b",
"BNF",
"c",
"19970701",
"g",
"AFNOR",
"2",
"intermrc"
]
]
}Append an array of fields to the record. Fields are inserted in order, based on the tag of the first field. Returns the record itself, so chaining is possible. For example:
record
.append(['952', ' ', 'a', 'MAIN', 'b', 'ANNEX', 'f', '12456', 'i', 'BOOK'],
['952', ' ', 'a', 'MAIN', 'b', 'MAIN', 'f', '45626', 'i', 'DVD'])
.append(['801', ' ', 'a', 'MYLIB']);Return a string representation of the record, in a specific format given as method parameter:
- text -- A human readable version of the MARC record.
- iso2709 -- Legacy ISO2709 format.
- marcxml -- Standard MARCXML.
- json -- JSON stringified version of the native record object.
- mij -- MARC-in-JSON. Alternative serialization format, as described here: https://github.com/marc4j/marc4j/wiki/MARC-in-JSON-Description
Example:
let { Record } = require('marcjs');
let record = new Record();
record.append(['245', ' 1', 'a', 'MARC history:', 'b', 'to the end'], ['100', ' ', 'a', 'Fredo']);
console.log(record.as('text'));
console.log(record.as('mij'));
console.log(record.as('marcxml'));Return a new record, clone of the record.
const clonedRecord = record.clone();Delete all fiels which tag match match regular expression. Returns the record
itself for chaining. For example:
record.delete(/9..|801/);Get fields with tag matching a regular expression. Returns an array of fiels in MARC-in-JSON format. If you want fields in MARC native format, just to a filter:
const fields = record.fields.filter((field) => field[0].match(/9..|801/));record.match(/9..|801/, (field) => {} {Return a MARC-in-JSON object representing the MARC record. Example:
{
"leader": "00705cam 2200241 450 ",
"fields": [
{
"001": "FRBNF465957890000009"
},
{
"003": "http://catalogue.bnf.fr/ark:/12148/cb46595789r"
},
{
"010": {
"subfields": [
{
"b": "Br."
}
],
"ind1": " ",
"ind2": " "
}
},
{
"100": {
"subfields": [
{
"a": "20200814g2019 m y0frey50 ba"
}
],
"ind1": " ",
"ind2": " "
}
},
{
"200": {
"subfields": [
{
"a": "Troie"
},
{
"b": "Texte imprimé"
},
{
"f": "David Gemmell"
}
],
"ind1": "1",
"ind2": " "
}
},
{
"210": {
"subfields": [
{
"a": "Paris"
},
{
"c": "Bragelonne"
},
{
"d": "DL 2016-"
}
],
"ind1": " ",
"ind2": " "
}
},
{
"700": {
"subfields": [
{
"3": "13548837"
},
{
"o": "ISNI0000000121449147"
},
{
"a": "Gemmell"
},
{
"b": "David"
},
{
"f": "1948-2006"
},
{
"4": "070"
}
],
"ind1": " ",
"ind2": "|"
}
}
]
}Marc object return other classes than Marc and Record classes. They can be invoqued directly.
- Iso2709 — Duplex stream reading/writing ISO2709 serialized records.
- Marcxml — Duplex stream reading/writing Marcxml serialized records.
- MiJ — Duplex stream reading/writing MARC-in-JSON serialized records.
- Text — Writable stream writing Text serialized records.
- Json — Writable stream writing Json serialized records. It's the marcjs native serialization format.
A command line script marcjs allows MARC record files manipulation from command line.
The module must be installed globaly: npm i marcjs -g.
Usage:
Usage: marc -p iso2709|marcxml|mij -f text|iso2709|marcxml|mij -o result file1 file2Default parser is iso2709 and default formater is text. Parser/formater must
be typed in lowercase.
Example:
# Same result: output a text version of bib1.mrc and bib2.mrc file
marcjs bib1.mrc bib2.mrc
marcjs -p iso2709 -f text bib1.mrc bib2.mrc
cat bib1.mrc bib2.txt | marcjs
# Output in MARC-in-JSON in bib1.mij file
marcjs -f mij -o bib1.mij bib1.mrc
- V1 : Until v1.2.3 (December 2020)
- V2 : From 2.0 (January 2021) — V2 changes the way the library is called.
Copyright (c) 2021 Frédéric Demians
Licensed under the MIT license.