How to use: JSON Lines to JSON

Description

Merge newline-delimited JSON records back into one array and report any malformed line by number.

• Data Conversion Tools
• Because everything is computed client-side, JSON Lines to JSON is safe to use with sensitive data such as API keys, tokens or private logs.

How to use

Using JSON Lines to JSON takes three steps:

1. Paste your data into the input box (or load the example).
2. Configure the options to match your target format or scenario.
3. Copy, download or inspect the output — it updates live as you type.

Run

Examples

Three NDJSON records merged into one array; malformed lines are reported by line number.

Input

{"id":1,"name":"Ada"}
{"id":2,"name":"Grace"}
{"id":3,"name":"Alan"}

Output

[
  {
    "id": 1,
    "name": "Ada"
  },
  {
    "id": 2,
    "name": "Grace"
  },
  {
    "id": 3,
    "name": "Alan"
  }
]

This output was produced by actually running the tool, not written by hand.

Use cases

Common situations where JSON Lines to JSON helps:

• Merge newline-delimited JSON records back into one array and report any malformed line by number.

Parameters

This tool has no options — it works on the input alone.

FAQ

Good to know

• Everything runs client-side, so extremely large inputs are limited by your browser tab’s memory rather than by a server upload limit.

Related tools

JSON Lines to JSON → · Data Conversion Tools →