400
HTTP 400 Bad Request
4xx Client Error
- Home
- > HTTP Status Codes >
- > 4xx >
- 400
Menu
Blog
Encoder & Decoder
Utility
General
- SMS Counter
- Check String Length
- Password Generator
- CHMOD Calculator
- Cron Job Command Generator
- Shortened URL Checker
- RGB to HEX Converter
- Epoch Unix Timestamp Converter
- UUID & ULID Generator
- Timezone Converter
Image Tools
PDF Tools
Minifier
Web Dev
- QR Code Generator
- Barcode Generator
- Lorem Ipsum Generator
- HTML Entities
- MIME Types Table Reference
- HTTP Status Codes
- What Is My IP Address
- JSON Formatter & Validator
- SQL Formatter & Beautifier
- XML Formatter & Beautifier
- YAML Formatter & Beautifier
- Text Case Converter
- JSON to CSV Converter
- Clipboard Workspace
- JSON Validator & Repair
- JSON Schema Validator
Laravel
- All Laravel Tools
- Collection Playground
- Eloquent Relationship Generator
- Validation Rule Generator
- Migration Generator
- Scheduler Generator
- Middleware Pipeline Visualizer
- Eloquent Query Builder Generator
- Laravel Artisan Cheat Sheet
Tailwind
4xx Client Error
RFC 7231, Section 6.5.1
What is HTTP 400 Bad Request?
The 400 (Bad Request) status code indicates that the server cannot or will not process the request due to something perceived as a client error — malformed request syntax, invalid request message framing, or deceptive request routing. This is a generic client error response that should be accompanied by an error message explaining the specific problem.
Common Use Cases
- Malformed JSON or XML in API requests
- Invalid query parameters
- Missing required headers
- Request body parsing errors