Fix NaN/Infinity in JSON (no upload)
JSON does not support NaN/Infinity. Use null or strings and validate locally before exporting.
NaN/Infinity is not valid JSON: strict JSON validation vs lenient JSON repair
A practical benchmark for NaN/Infinity is not valid JSON: trade-offs between strict JSON validation and lenient JSON repair, plus actionable next steps.
TL;DR: Start strict on a sample, apply minimal fixes, then scale only after validation passes.
Decision matrix
| Criteria | strict JSON validation | lenient JSON repair |
|---|---|---|
| Best when | You need strict, repeatable output | You need rapid triage on messy input |
| Risk profile | Lower hidden-issue risk, more upfront checks | Higher hidden-issue risk, faster initial pass |
| Typical speed | Slower first pass, faster downstream debugging | Faster first pass, may need rework later |
| Good for | Stable JSON pipelines | One-off fixes and incoming unknown formats |
| Avoid if | Input is heavily malformed and urgent turnaround is required | You need audit-grade guarantees |
Choose strict JSON validation when
- You need deterministic results for repeated JSON runs.
- You are fixing production data where hidden breakage is costly.
- You want clear pass/fail criteria before conversion or export.
Choose lenient JSON repair when
- You are in early triage and need to narrow the problem quickly.
- You are dealing with mixed-quality inbound files from multiple sources.
- You need an iterative cleanup loop before strict validation.
Recommended no-upload workflow
- Validate a representative sample first. Confirm exact error class/position.
- Pick workflow A or B. Use strict path for quality, flexible path for triage.
- Apply the smallest safe fix. Avoid broad rewrites before validation is green.
- Re-validate and convert/export. Only then run batch processing.
Recommended tools
Relevant guides
Auto-selected from existing guides for this topic. Need more: search by keyword.
System.Text.Json.JsonException: 'N' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0.: what it means and how to fix it
Newtonsoft.Json error ('N' is an invalid start of a value. LineNumber: 0 | ByteP...): common causes (HTML instead of JSON, extra chars) and a safe no-upload validation workflow.
System.Text.Json.JsonException: 'I' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0.: what it means and how to fix it
Newtonsoft.Json error ('I' is an invalid start of a value. LineNumber: 0 | ByteP...): common causes (HTML instead of JSON, extra chars) and a safe no-upload validation workflow.
Avoid precision loss with large JSON numbers (no upload)
Why large integers lose precision in JS, how to keep them as strings, and how to validate locally before converting.
json: unknown field "tenantId": what it means and how to fix it
Go JSON strict decode error (unknown field "tenantId"): unknown fields from schema drift. Update mapping or loosen strictness (no upload).
SyntaxError: Unexpected token N in JSON at position 0: what it means and how to fix it
Fix JSON parsing error (Unexpected token N in JSON at position 0): what it means, top causes, and a no-upload workflow to validate and repair JSON locally.
SyntaxError: Unexpected token I in JSON at position 0: what it means and how to fix it
Fix JSON parsing error (Unexpected token I in JSON at position 0): what it means, top causes, and a no-upload workflow to validate and repair JSON locally.
JSON::ParserError: 765: unexpected token at 'NaN': what it means and how to fix it
Fix JSON parsing error (:ParserError: 765: unexpected token at 'NaN'): what it means, top causes, and a no-upload workflow to validate and repair JSON locally.
Related actions
- Deep topic hub: NaN/Infinity is not valid JSON
- Execution playbook for NaN/Infinity is not valid JSON
- Decision comparison for NaN/Infinity is not valid JSON
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- Case study for NaN/Infinity is not valid JSON
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- Search tools for "nan infinity json number NaN/Infinity is not valid JSON"
Related benchmarks
- NDJSON/JSONL vs JSON
- Newlines in JSON strings
- Pretty vs minified JSON (debug faster)
- Missing quotes around JSON keys/strings
- Missing colon after JSON key
- JSON to XML: safe no-upload workflow
Related by intent
- Intent hub for NaN/Infinity is not valid JSON
- Execution playbook
- Method comparison
- Alternative flows
- Migration path
- Benchmark baseline
- Case study
- Trend report
- Cluster pillar
- Cross-cluster pillar: CSV
- Linkable data asset
Expert signal
Expert note: NaN/Infinity is not valid JSON usually resolves fastest when triage starts from strict validation and then branches to comparison/alternative paths based on input quality.
Data snapshot 2026
| Metric | Value |
|---|---|
| Intent confidence score | 94/100 |
| Predicted CTR uplift potential | 28% |
| Target crawl depth | < 3 clicks |
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