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YAML to JSONL

Convert YAML to JSONL free, in seconds. Paste your data below, press Convert, then copy the result and stream it into logs, pipelines and data tools. Everything runs in your browser, so nothing is ever uploaded.

YAML input

Paste your YAML below, then press Convert.

Lists of maps convert best. Nested maps are flattened with dot notation.

JSONL output

Waiting for YAML input.

Private by design: parsing uses the js-yaml library (loaded once from a CDN); the conversion itself happens locally and your data is never uploaded.
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How this conversion works

Paste YAML into the input box and press Convert (or just keep typing, conversion happens as you type). The tool parses it with the js-yaml library, then writes one compact JSON object per line, the standard JSON Lines format. Parsing uses the js-yaml library (loaded once from a CDN); the conversion itself happens locally and your data is never uploaded.

Using JSON Lines

JSON Lines puts one complete JSON object on each line with no outer array and no trailing commas. Unlike a JSON array, which must be parsed whole, JSONL can be read line by line, which makes it ideal for huge files, log pipelines, BigQuery imports, Elasticsearch bulk loads and machine-learning datasets. Each line keeps the full nested structure of its record.

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YAML to JSONL FAQs

Why convert YAML to JSONL?
JSON Lines is the standard for streaming data: log pipelines, BigQuery imports, Elasticsearch bulk loads and ML training sets all accept one JSON object per line. It is the format of choice when a JSON array would be too big to parse at once.
How is my YAML parsed?
With the js-yaml library. A list of maps becomes one row per item, a single map becomes one row, and nested maps are flattened with dot notation so tabular output stays clean.
How is JSONL different from a JSON array?
A JSON array must be loaded and parsed whole, while JSONL can be processed line by line. That makes JSONL far better for huge files and streaming processors that handle records as they arrive.
Is nested data preserved?
Yes. Each line keeps the full nested structure of its record as compact JSON, so nothing is flattened or lost in the conversion.
Is my data sent to a server?
No. parsing uses the js-yaml library (loaded once from a CDN); the conversion itself happens locally and your data is never uploaded.
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