SyntaxError: Unterminated string in JSON at position 10: what it means and how to fix it
Fix JSON parsing error (Unterminated string in JSON at position 10): what it means, top causes, and a no-upload workflow to validate and repair JSON locally.
Unterminated string in JSON: validate-first workflow vs repair-first workflow
Unterminated string in JSON: when to choose validate-first workflow vs repair-first workflow, with a safe no-upload decision workflow.
TL;DR: Start strict on a sample, apply minimal fixes, then scale only after validation passes.
Decision matrix
| Criteria | validate-first workflow | repair-first workflow |
|---|---|---|
| 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 validate-first workflow 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 repair-first workflow 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.
JSON.parse: unterminated string at line 1 column 10 of the JSON data: causes and fixes
Firefox JSON.parse error (unterminated string at line 1 column 10 of the JSON data): how to use line/column to pinpoint the issue and validate JSON locally (no upload).
JSONDecodeError: Unterminated string starting at: line 1 column 10 (char 9): what it means and how to fix it
Python json JSONDecodeError (Unterminated string starting at: line 1 column 10 (char 9)): common causes (empty input, extra data, encoding) and fast fixes with local validation (no upload).
json.decoder.JSONDecodeError: Unterminated string starting at: line 1 column 10 (char 9): what it means and how to fix it
Python json.decoder JSONDecodeError (Unterminated string starting at: line 1 column 10 (char 9)): common causes (empty input, extra data, encoding) and fast fixes with local validation (no upload).
simplejson.errors.JSONDecodeError: Unterminated string starting at: line 1 column 10 (char 9): what it means and how to fix it
Python simplejson JSONDecodeError (Unterminated string starting at: line 1 column 10 (char 9)): common causes (empty input, extra data, encoding) and fast fixes with local validation (no upload).
How to fix “JSON.parse” errors (and avoid them next time)
Learn how to troubleshoot JSON.parse errors like “Unexpected token” and validate JSON safely. Includes quick fixes and a no-upload validator.
Fix newlines in JSON strings (no upload)
How to represent newlines correctly inside JSON strings and avoid parse errors.
Trailing commas in JSON: why they break parsing (and fixes)
Trailing commas are a top cause of JSON.parse errors. Learn where they appear, how to spot them quickly, and validate JSON locally (no upload).
Related actions
- Deep topic hub: Unterminated string in JSON
- Execution playbook for Unterminated string in JSON
- Decision comparison for Unterminated string in JSON
- Alternative paths for Unterminated string in JSON
- Migration path for Unterminated string in JSON
- Case study for Unterminated string in JSON
- All JSON subtopics
- Search tools for "unterminated string newline in string json parse error"
Related benchmarks
- UTF-8 BOM breaks JSON parsers
- Validate JSON before exporting
- Big integers and precision loss
- Unexpected token in JSON
- Unexpected end of JSON input
- Unexpected character in JSON
Related by intent
- Intent hub for Unterminated string in 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: Unterminated string in 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 | 82/100 |
| Predicted CTR uplift potential | 17% |
| Target crawl depth | < 3 clicks |
Trust note: All processing happens locally in your browser. Files are never uploaded.
Privacy & Security
All processing happens locally in your browser. Files are never uploaded.