Inspect nested structure
Searchable tree and raw editor views make nested objects, arrays, keys, values, and record boundaries easier to inspect.
FREE BROWSER-LOCAL FILE TOOLS
Open JSON Lines as records.
View, edit and validate JSONL locally. Search records, inspect object rows as a table, and download normalized JSON Lines without an upload.
Step 1: open your file
Start with JSONL: one complete JSON value per non-empty line. Contents stay in this browser.
- Search and inspect records, edit their source, and review validation feedback.
- Download normalized JSONL records.
Paste JSONL
File contents stay in this browser. Download changes before refreshing or closing the tab.
Edit, format and validate
Every non-empty line must contain exactly one complete JSON value. Syntax problems are reported without sending the document to a server.
Choose the matching format
Use JSON for one complete value, JSONL or NDJSON for one JSON value per line.
Frequently asked questions
What is a JSONL file?
JSON Lines stores records as separate JSON values, one per record line. Open .jsonl or .ndjson files to inspect records in Source, Tree or Table views.
Can I edit and download JSON Lines?
Yes. Edit record source, review validation feedback, then download normalized JSONL with one complete JSON value per record line.
Does my JSON file get uploaded?
Local editing processes selected and pasted contents in your browser. Optional Assistance sends your goal and only the context you explicitly prepare and include, such as a selected subtree or observed query field metadata, to OpenRouter and the configured model provider. Its preview shows exactly what is included. Ordinary page and asset requests also reach the hosting provider.