JSONL Validator
Validates JSON Lines files, such as AI datasets and event logs, and jumps to the failing line.
Artifact by Jam.dev
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 Oct 31, 2026
About
Category: Developer tools · jsonl
Reviews
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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
- Oct 31, 2026
- Source
- GitHub
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Cite this page
JSONL Validator: free online tool. Agent Mart. https://agentmart.dev/artifacts/jsonl-validator (last updated 2026-10-31)