JSONL Validator
Validates JSON Lines files, such as AI datasets and event logs, and jumps to the failing line.
Artifact by Jam.dev
IndexedGPL-3.0Developer toolsNo sign-upRuns in your browser
Use it
Opens jam.dev in a new tab. Nothing to install.
- You provide
- JSONL text or file
- You get
- Per-line validation, JSON export
- Account
- No sign-up needed
- AI
- No AI: a plain tool
- Your input
- Processed in your browser, not uploaded (stated by the tool or its repo)
- Price
- Free to use
- Made with
- Open-source web app
- Source
- Open source
- Link check
- Answered on Nov 1, 2026
About
JSONL Validator is an open-source web app in the developer tools category (jsonl). It opens in your browser, so there is nothing to install. You provide JSONL text or file and get per-line validation, JSON export. Your input is processed on your device and not uploaded. It needs no account. It is a plain tool: no AI model is involved. The source code is public on GitHub (jamdotdev/jam-dev-utilities).
Category: Developer tools · jsonl
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Details
- Auth
- No auth
- License
- GPL-3.0
- Repository
- github.com/jamdotdev/jam-dev-utilities
- First seen
- Oct 31, 2026
- Last checked
- Nov 1, 2026
- Source
- GitHub
More from Jam.dev
Cite this page
JSONL Validator: free online tool. Agent Mart. https://agentmart.dev/artifacts/jsonl-validator (last updated 2026-11-01)