Convert JSONL to JSON Array (Line-by-Line Error Reporting)

Going from JSONL back to a normal JSON array means parsing every line independently and collecting the results into one array — which also means a single malformed line doesn't have to take down the whole file silently.

The real behavior

Line handling, precisely: blank lines (including a trailing newline at end of file) are trimmed and filtered out before parsing — they don't produce empty array entries or errors. Each remaining line is parsed with its own JSON.parse call; if one is invalid, the error message is prefixed with the exact 1-indexed line number — "Line 3: Unexpected token..." — instead of a generic parse failure, so you can jump straight to the broken record in a large export instead of bisecting the file by hand.

Converters

JSON ↔ JSONL Converter

Convert between JSON arrays and JSON Lines (JSONL) format.

JSONL Input (one JSON object per line)

3 objects191 bytes

[
  {
    "id": 1,
    "name": "Alice",
    "role": "admin"
  },
  {
    "id": 2,
    "name": "Bob",
    "role": "user"
  },
  {
    "id": 3,
    "name": "Charlie",
    "role": "editor"
  }
]

JSON ↔ JSONL Converter: Convert between JSON arrays and JSON Lines (JSONL) format. Runs entirely in your browser — paste your input, get instant output, nothing is uploaded.

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