Rust errors
High-intent troubleshooting for parsing and validation errors in Rust. Use the exact error message and fix the first real issue.
TL;DR: Validate strictly, fix the first error, then validate again before converting.
Jump to section
Top tools (local-only)
- JSON Validator
- JSON Repair
- YAML Validator
- CSV Validator
- XML to JSON
- Base64 Encode/Decode
- URL Encode/Decode
- JWT Decoder
JSON parse / deserialize errors
Most issues are not “bad JSON” but wrong content (HTML), truncation, extra characters, invalid escapes, or encoding.
- expected ',' or ']' at line 1 column 10
- expected ':' at line 1 column 10
- expected value at line 1 column 1
- invalid type: boolean true, expected a borrowed string at line 1 column 1
- invalid type: boolean true, expected a borrowed string at line 1 column 2
- invalid type: boolean true, expected a map at line 1 column 1
- invalid type: boolean true, expected a map at line 1 column 2
- invalid type: boolean true, expected a sequence at line 1 column 1
- invalid type: boolean true, expected a sequence at line 1 column 2
- invalid type: boolean true, expected a string at line 1 column 1
- invalid type: boolean true, expected a string at line 1 column 2
- invalid type: boolean true, expected bool at line 1 column 1
- invalid type: boolean true, expected bool at line 1 column 2
- invalid type: boolean true, expected f64 at line 1 column 1
- invalid type: boolean true, expected f64 at line 1 column 2
- invalid type: boolean true, expected i64 at line 1 column 1
- invalid type: boolean true, expected i64 at line 1 column 2
- invalid type: boolean true, expected u64 at line 1 column 1
- invalid type: boolean true, expected u64 at line 1 column 2
- invalid type: boolean true, expected unit at line 1 column 1
- invalid type: boolean true, expected unit at line 1 column 2
- invalid type: float 1.23, expected a borrowed string at line 1 column 1
- invalid type: float 1.23, expected a borrowed string at line 1 column 2
- invalid type: float 1.23, expected a map at line 1 column 1
- invalid type: float 1.23, expected a map at line 1 column 2
- invalid type: float 1.23, expected a sequence at line 1 column 1
- invalid type: float 1.23, expected a sequence at line 1 column 2
- invalid type: float 1.23, expected a string at line 1 column 1
- invalid type: float 1.23, expected a string at line 1 column 2
- invalid type: float 1.23, expected bool at line 1 column 1
- invalid type: float 1.23, expected bool at line 1 column 2
- invalid type: float 1.23, expected f64 at line 1 column 1
- invalid type: float 1.23, expected f64 at line 1 column 2
- invalid type: float 1.23, expected i64 at line 1 column 1
- invalid type: float 1.23, expected i64 at line 1 column 2
- invalid type: float 1.23, expected u64 at line 1 column 1
- invalid type: float 1.23, expected u64 at line 1 column 2
- invalid type: float 1.23, expected unit at line 1 column 1
- invalid type: float 1.23, expected unit at line 1 column 2
- invalid type: integer 123, expected a borrowed string at line 1 column 1
- invalid type: integer 123, expected a borrowed string at line 1 column 2
- invalid type: integer 123, expected a map at line 1 column 1
- invalid type: integer 123, expected a map at line 1 column 2
- invalid type: integer 123, expected a sequence at line 1 column 1
- invalid type: integer 123, expected a sequence at line 1 column 2
- invalid type: integer 123, expected a string at line 1 column 1
- invalid type: integer 123, expected a string at line 1 column 2
- invalid type: integer 123, expected bool at line 1 column 1
- invalid type: integer 123, expected bool at line 1 column 2
- invalid type: integer 123, expected f64 at line 1 column 1
- invalid type: integer 123, expected f64 at line 1 column 2
- invalid type: integer 123, expected i64 at line 1 column 1
- invalid type: integer 123, expected i64 at line 1 column 2
- invalid type: integer 123, expected u64 at line 1 column 1
- invalid type: integer 123, expected u64 at line 1 column 2
- invalid type: integer 123, expected unit at line 1 column 1
- invalid type: integer 123, expected unit at line 1 column 2
- invalid type: map, expected a borrowed string at line 1 column 1
- invalid type: map, expected a borrowed string at line 1 column 2
- invalid type: map, expected a map at line 1 column 1
- invalid type: map, expected a map at line 1 column 2
- invalid type: map, expected a sequence at line 1 column 1
- invalid type: map, expected a sequence at line 1 column 2
- invalid type: map, expected a string at line 1 column 1
- invalid type: map, expected a string at line 1 column 2
- invalid type: map, expected bool at line 1 column 1
- invalid type: map, expected bool at line 1 column 2
- invalid type: map, expected f64 at line 1 column 1
- invalid type: map, expected f64 at line 1 column 2
- invalid type: map, expected i64 at line 1 column 1
- invalid type: map, expected i64 at line 1 column 2
- invalid type: map, expected u64 at line 1 column 1
- invalid type: map, expected u64 at line 1 column 2
- invalid type: map, expected unit at line 1 column 1
- invalid type: map, expected unit at line 1 column 2
- invalid type: null, expected a borrowed string at line 1 column 1
- invalid type: null, expected a borrowed string at line 1 column 2
- invalid type: null, expected a map at line 1 column 1
- invalid type: null, expected a map at line 1 column 2
- invalid type: null, expected a sequence at line 1 column 1
- invalid type: null, expected a sequence at line 1 column 2
- invalid type: null, expected a string at line 1 column 1
- invalid type: null, expected a string at line 1 column 2
- invalid type: null, expected bool at line 1 column 1
- invalid type: null, expected bool at line 1 column 2
- invalid type: null, expected f64 at line 1 column 1
- invalid type: null, expected f64 at line 1 column 2
- invalid type: null, expected i64 at line 1 column 1
- invalid type: null, expected i64 at line 1 column 2
- invalid type: null, expected u64 at line 1 column 1
- invalid type: null, expected u64 at line 1 column 2
- invalid type: null, expected unit at line 1 column 1
- invalid type: null, expected unit at line 1 column 2
- invalid type: sequence, expected a borrowed string at line 1 column 1
- invalid type: sequence, expected a borrowed string at line 1 column 2
- invalid type: sequence, expected a map at line 1 column 1
- invalid type: sequence, expected a map at line 1 column 2
- invalid type: sequence, expected a sequence at line 1 column 1
- invalid type: sequence, expected a sequence at line 1 column 2
- invalid type: sequence, expected a string at line 1 column 1
- invalid type: sequence, expected a string at line 1 column 2
- invalid type: sequence, expected bool at line 1 column 1
- invalid type: sequence, expected bool at line 1 column 2
- invalid type: sequence, expected f64 at line 1 column 1
- invalid type: sequence, expected f64 at line 1 column 2
- invalid type: sequence, expected i64 at line 1 column 1
- invalid type: sequence, expected i64 at line 1 column 2
- invalid type: sequence, expected u64 at line 1 column 1
- invalid type: sequence, expected u64 at line 1 column 2
- invalid type: sequence, expected unit at line 1 column 1
- invalid type: sequence, expected unit at line 1 column 2
- invalid type: string "abc", expected a borrowed string at line 1 column 1
- invalid type: string "abc", expected a borrowed string at line 1 column 2
- invalid type: string "abc", expected a map at line 1 column 1
- invalid type: string "abc", expected a map at line 1 column 2
- invalid type: string "abc", expected a sequence at line 1 column 1
- invalid type: string "abc", expected a sequence at line 1 column 2
- invalid type: string "abc", expected a string at line 1 column 1
- invalid type: string "abc", expected a string at line 1 column 2
- invalid type: string "abc", expected bool at line 1 column 1
- invalid type: string "abc", expected bool at line 1 column 2
- invalid type: string "abc", expected f64 at line 1 column 1
- invalid type: string "abc", expected f64 at line 1 column 2
- invalid type: string "abc", expected i64 at line 1 column 1
- invalid type: string "abc", expected i64 at line 1 column 2
- invalid type: string "abc", expected u64 at line 1 column 1
- invalid type: string "abc", expected u64 at line 1 column 2
- invalid type: string "abc", expected unit at line 1 column 1
- invalid type: string "abc", expected unit at line 1 column 2
- trailing characters at line 1 column 2
Related hubs
FAQ (quick)
Start here: Errors hub (runs locally, no upload).
Can I fix Rust errors without uploading my data? Yes. no-upload.ru tools run locally in your browser (NO UPLOAD). Start with Errors hub and keep samples redacted if you must share them.
What is the fastest safe workflow? Validate first, fix the smallest broken part, then validate again before converting/exporting. This prevents silent downstream issues.
Why does Rust errors happen? Most issues come from copy/paste truncation, wrong encoding, non-strict syntax (comments/trailing commas), or a shape mismatch (array vs object).
Which tool should I start with for Rust errors? Start with Errors hub. If you still see errors, follow the related playbook/trend report on this page.
Privacy & Security
All processing happens locally in your browser. Files are never uploaded.