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Parse a string containing serialized newline-delimited JSON (NDJSON).
npm install @stdlib/utils-parse-ndjsonvar parseNDJSON = require( '@stdlib/utils-parse-ndjson' );Parses a string as newline-delimited JSON.
var out = parseNDJSON( '{"beep":"boop"}\n{"example":42}' );
// returns [ { 'beep': 'boop' }, { 'example': 42 } ]To transform the string being parsed, provide a reviver.
function reviver( key, value ) {
if ( key === '' || key === 'beep' ) {
return ( typeof value === 'string' ) ? value.toUpperCase() : value;
}
return ( typeof value === 'number' ) ? value * 2 : value;
}
var str = '{"beep":"boop"}\n{"value": 20}\n{"numbers": [1,2,3]}';
var out = parseNDJSON( str, reviver );
// returns [ { 'beep' : 'BOOP' }, { 'value': 40 }, { 'numbers': [ 2, 4, 6 ] } ]-
In contrast to the native
JSON.parse(), this implementation parsesstringasnewline-delimited JSONand returns an array of parsed JSONs.var out = JSON.parse( '{"beep":"boop"}\n{"foo":"baz"}' ); // throws <SyntaxError> out = parseNDJSON( '{"beep":"boop"}\n{"foo":"baz"}' ); // returns [ { 'beep': 'boop' }, { 'foo': 'baz' } ]
-
In contrast to the native
JSON.parse(), this implementation throws a TypeError if provided any value which is not astring.var out = JSON.parse( null ); // returns null out = parseNDJSON( null ); // throws <TypeError>
-
In contrast to the native
JSON.parse(), this implementation does not throw a SyntaxError if unable to parse a string as newline-delimited JSON.var out = parseNDJSON( '{"beep":boop}' ); // returns <SyntaxError> out = JSON.parse( '{"beep":boop}' ); // throws <SyntaxError>
-
In contrast to the native
JSON.parse(), this implementation throws a TypeError if provided a reviver argument which is not a function.var out = JSON.parse( '{"a":"b"}', [] ); // returns { 'a': 'b' } out = parseNDJSON( '{"a":"b"}', [] ); // throws <TypeError>
var parseNDJSON = require( '@stdlib/utils-parse-ndjson' );
var out = parseNDJSON( '{"name":"John"}\n{"name":"Doe"}' );
// returns [ { 'name': 'John' }, { 'name': 'Doe' } ]
function reviver( key, value ) {
if ( key === 'name' ) {
return value.toUpperCase();
}
return value;
}
out = parseNDJSON( '{"name":"John"}\n{"name":"Doe"}', reviver );
// returns [ { 'name': 'JOHN' }, { 'name': 'DOE' } ]
out = parseNDJSON( '{"name":John}\n{"name":Doe}' );
// returns <SyntaxError>
out = parseNDJSON( ' ' );
// returns []
out = parseNDJSON( '{}' );
// returns [ {} ]
out = parseNDJSON( '{"name":"Eve"}\n42\ntrue\n[1,2,3]' );
// returns [ { 'name': 'Eve' }, 42, true, [ 1, 2, 3 ] ]
out = parseNDJSON( '{"name":"John"}\r\n{"name":"Doe"}' );
// returns [ { 'name': 'John' }, { 'name': 'Doe' } ]
out = parseNDJSON( '{"name":"John"}\n{"name":"Doe"}\n' );
// returns [ { 'name': 'John' }, { 'name': 'Doe' } ]This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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