NDJSON Schema Consistency Checker
Scan NDJSON records for field drift, missing keys, invalid lines, and mixed value types.
Also useful for: ndjson schema checker jsonl schema checker ndjson field drift json lines consistency checker NDJSON Schema Consistency Checker
NDJSON Schema Consistency Checker
Runs in your browser. Inputs are not uploaded.NDJSON Schema Consistency Checker Example Run
Find field drift in line-delimited event data.
Sample inputs
{"id":1,"email":"ada@example.com","active":true}
{"id":"2","email":"grace@example.com"}
{"id":3,"name":"Lin","active":false}
Generated result
Summary: 3 NDJSON records checked. 1 warning, 3 notes.
Stats
- Records: 3
- Fields: 4
Issues
- Warning: id has multiple types: number, string.
- Note: email is missing from 1 record.
- Note: active is missing from 1 record.
- Note: name is missing from 2 records.
Output
id: number (2), string (1)
email: string (2)
active: boolean (2)
name: string (1) What the NDJSON Schema Consistency Checker Checks
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One object per line
Each non-empty line must parse as a JSON object.
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Field inventory
All keys seen across records are collected into an inferred schema summary.
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Type drift
Fields with more than one observed value type are reported as warnings.
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Missing fields
Fields absent from some records are reported so optional versus accidental gaps are visible.
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Streaming-friendly input
The checker works on pasted NDJSON or JSONL without wrapping records in an array.
NDJSON Schema Consistency Checker Questions
- Q: Does the NDJSON schema consistency checker upload my NDJSON? A: No. Inputs are processed in your browser, and pasted content is not sent to analytics or a server.
- Q: What should I paste into the NDJSON schema consistency checker? A: Paste one JSON object per line from logs, events, exports, or JSONL datasets.
- Q: What can I copy or download? A: You can copy the inferred field/type report.
- Q: What does the NDJSON schema consistency checker not verify? A: It does not infer a formal JSON Schema, validate business rules, or sample files larger than the browser can comfortably process.
Related Tools
Updates
- v1.0.0 New 2026-05-17: Initial NDJSON parser with field inventory, type drift, and missing-field checks added.