Tools
- JSON Formatter
Pretty-print and validate JSON.
- YAML ↔ JSON Converter
Convert between YAML and JSON.
- Base64 Encode / Decode
Encode or decode Base64, with full Unicode support.
- JWT Decoder
Inspect a JWT header and payload (decode-only, no verification).
- Timestamp / Epoch Converter
Convert between Unix epoch and ISO 8601.
- UUID & Hash Generator
Generate a UUID v4, or hash text with MD5, SHA-1, SHA-256, or SHA-512.
- JSON Diff Viewer
Compare two JSON payloads and see what changed.
- Cron Expression Explainer
Parse a cron expression and get a plain-English explanation.
- JWT Encoder
Build and sign an HS256 JSON Web Token from a header, payload, and secret.
- Regex Tester
Test a regular expression against sample text with match, group, and index details.
- Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, and more.
- URL Encoder / Decoder
Encode or decode URL components (percent-encoding).
- Color Picker
Convert colors between HEX, RGB, and HSL with a live swatch preview.
- SQL Formatter
Beautify SELECT, INSERT, UPDATE, and DELETE SQL statements.
- GraphQL Query Formatter
Pretty-print a GraphQL query, mutation, or fragment.
- OpenAPI / Swagger Validator
Check an OpenAPI or Swagger document for structural issues: missing fields, dangling $refs, duplicate operationIds.
- Protobuf Text ↔ JSON
Convert between Protocol Buffers text format and JSON.
- curl → fetch/axios
Convert a curl command into equivalent fetch or axios JavaScript code.