Studio ndjson

☯️ Transforms to parse and stringify ndjson.

This module also works in the browser using a naive stream shim for small Browserify bundles.

Usage

To stringify an object stream into ndjson:

const StringifyTransform = require('@studio/ndjson/stringify');

object_stream.pipe(new StringifyTransform()).pipe(process.stdout);

To parse ndjson into an object stream:

const ParseTransform = require('@studio/ndjson/parse');

process.stdin.pipe(new ParseTransform()).pipe(object_stream);

Install

❯ npm i @studio/ndjson

API

Require the transform you need:

• @studio/ndjson/stringify: Exports the StringifyTransform class which reads objects and writes strings.
• @studio/ndjson/parse: Exports the ParseTransform class which reads strings and writes objects.

The module main exports StringifyTransform and ParseTransform if you need both:

const { StringifyTransform, ParseTransform } = require('@studio/ndjson');

ParseTransform options

The ParseTransform constructor accepts an options object with these properties:

• loose: Whether to ignore data before the first { in each line.
• loose_out: A stream to receive data that was found before the first { in each line. Implies loose.

Error handling

If JSON.parse or JSON.stringify throw an error, the transform emits an error event with the error object having a code property with ERR_JSON_PARSE or ERR_JSON_STRINGIFY. For parse errors, the line property on the error is the string that could not be parsed.

Related modules

• 👻 Studio Log: This module was refactored out of the logger for JavaScript Studio.
• 💧 Studio Browser Stream is a naive stream shim for small Browserify bundles.
• 📦 Studio Changes is used to create the changelog for this module.

License

MIT

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