JSON

JSONL Validator

Validate JSON Lines (JSONL/NDJSON) format line by line. Convert valid records to a clean JSON array.

JSONL Input5 lines

Validation4 valid1 invalid

1✓{"id":1,"name":"Alice","role":"admin"}

2✓{"id":2,"name":"Bob","role":"user"}

3✓{"id":3,"name":"Charlie","role":"user"}

4✗{invalid json line here}error

5✓{"id":5,"name":"Eve","active":true}

JSON Array (valid lines only)

[
  {
    "id": 1,
    "name": "Alice",
    "role": "admin"
  },
  {
    "id": 2,
    "name": "Bob",
    "role": "user"
  },
  {
    "id": 3,
    "name": "Charlie",
    "role": "user"
  },
  {
    "id": 5,
    "name": "Eve",
    "active": true
  }
]

What is JSONL?

JSON Lines (JSONL), also called NDJSON (Newline Delimited JSON), is a format where each line is a valid, self-contained JSON value. It's ideal for streaming, logs, and large datasets.

Rules

Each non-empty line must be valid JSON
Lines are separated by \n (Unix newlines recommended)
Empty lines are allowed and skipped
No trailing commas or surrounding array brackets

Common Uses

Log files and event streams
Machine learning training data
Database exports and ETL pipelines
Streaming APIs (each chunk is one JSON line)