Encoding issues in CSV/JSON: UTF‑8, BOM, and weird characters
Fix encoding issues like UTF‑8 BOM, strange header characters, and broken symbols in CSV/JSON. Convert locally and validate output (no upload).
UTF-8 BOM breaks JSON parsers Playbook
UTF-8 BOM breaks JSON parsers. Practical troubleshooting runbook for repeatable fixes and safer conversions.
TL;DR: Validate -> locate exact failing spot -> fix the minimal part -> re-validate.
Execution steps
- Validate input locally. Start with a validator or parser-friendly converter.
- Locate root cause. Use line/position/error token to isolate one failing place.
- Apply a minimal fix. Do not refactor all content at once.
- Re-validate and continue. Once clean, convert/export safely.
Recommended tools
Relevant guides
Auto-selected from existing guides for this topic. Need more: search by keyword.
Unexpected token ï in JSON at position 0: what it means and how to fix it
JavaScript: Fix "Unexpected token ï in JSON at position 0": payload starts with a UTF-8 BOM () or invisible leading character. Strip BOM and validate...
SyntaxError: Unexpected token ï in JSON at position 0: what it means and how to fix it
Node.js: Fix "Unexpected token ï in JSON at position 0": payload starts with a UTF-8 BOM () or invisible leading character. Strip BOM and validate lo...
Guides by topic
Browse troubleshooting and conversion guides grouped by topic (JSON, CSV, XML, YAML, encoding, config formats, privacy).
json_decode(): Syntax error: what it means and how to fix it
PHP json_decode error (Syntax error): strict JSON rules, UTF-8/control characters, and quick fixes you can do locally (no upload).
json_last_error_msg(): No error: what it means and how to fix it
PHP json_last_error_msg error (No error): strict JSON rules, UTF-8/control characters, and quick fixes you can do locally (no upload).
System.Text.Json.JsonException: 'ï' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0.: what it means and how to fix it
Newtonsoft.Json error ('ï' 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.
json_decode(): Recursion detected: what it means and how to fix it
PHP json_decode error (Recursion detected): strict JSON rules, UTF-8/control characters, and quick fixes you can do locally (no upload).
Related actions
- Deep topic hub: UTF-8 BOM breaks JSON parsers
- Decision comparison: UTF-8 BOM breaks JSON parsers
- Alternative flows: UTF-8 BOM breaks JSON parsers
- Migration path: UTF-8 BOM breaks JSON parsers
- Case study: UTF-8 BOM breaks JSON parsers
- Trend report: UTF-8 BOM breaks JSON parsers
- Pillar for JSON
- Data asset: UTF-8 BOM breaks JSON parsers
- All JSON subtopics
- Search tools for "bom utf-8 encoding UTF-8 BOM breaks JSON parsers"
Related playbooks
- Validate JSON before exporting
- Big integers and precision loss
- Control characters in JSON strings
- Unterminated string in JSON
- Unexpected token in JSON
- Unexpected end of JSON input
Related by intent
- Intent hub for UTF-8 BOM breaks JSON parsers
- 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: UTF-8 BOM breaks JSON parsers 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 | 76/100 |
| Predicted CTR uplift potential | 20% |
| Target crawl depth | < 3 clicks |
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Privacy & Security
All processing happens locally in your browser. Files are never uploaded.