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GigaJSON

JSON Lines to JSON

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JSON Lines (also called NDJSON or JSONL) puts one JSON value on each line, which is how many logs and data exports are written. Paste it here to get a single JSON array. Blank lines are skipped, and a bad line is reported by its number.

How to use it

  1. Paste JSON Lines or open a .jsonl or .ndjson file.
  2. The JSON array appears as you type.
  3. Copy it, download it, or open it in GigaJSON.

Read more: How to view and query API responses and NDJSON logs

Private, and made for big files

This tool runs in your browser, in a background worker: nothing you paste or open is uploaded, and nothing is kept after you leave. JSON and XML input can be up to 1 GB, depending on available memory. Processing runs in a background worker; large analyses can take a minute or more. If your connection drops while you're here, the tool keeps working. When one tool isn't enough, GigaJSON opens your data with a tree, a table, JSONPath/JMESPath/jq queries, transforms, diff and history.

Questions

What is JSON Lines?

A text format with one complete JSON value per line. It's easy to append to and to stream, so logs and exports use it a lot.

Is my data uploaded?

No. The tool runs in your browser, in a background worker. Nothing you paste or open goes to a server, and nothing is kept after you leave the page.

How large a file can it handle?

JSON and XML input can be up to 1 GB, depending on memory. CSV/YAML input and JSON repair are limited to 128 MB. Conversion runs in a background worker. jq, text editing and text-based exports have separate limits, shown when you use them.

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