NextGenToolkit
Developer Tools
Format & auto-repair broken JSON, calculate LLM tokens, test Regex ASTs, decode JWT claims, and run Myers code diffs.
Key Capabilities & LSI Topics: JSON syntax auto-repair & CSV/TS converter · BPE LLM token & API cost calculator · ECMAScript Regex AST explainer · RFC 7519 JWT payload & exp decoder · Myers O(ND) unified diff & Git patch · UTF-8 TextEncoder Base64 & URL codec
Available Developer Tools (6)
- JSON Formatter & Auto-Fixer — Format, validate, auto-fix broken JSON, and convert to CSV, YAML, TS & SQL.
- LLM Token Counter & Context Packer — Count tokens and API cost across Gemini, GPT-4o & Claude + pack multi-file prompts.
- Live Regex Tester & AST Library — Test regular expressions in real time with capture groups and plain-English AST breakdown.
- JWT Decoder & Inspector — Decode JSON Web Tokens (Header & Payload) with live expiration countdown.
- Code & Text Diff Checker — Compare two code or text blocks using Myers diff algorithm with .patch export.
- Base64, URL & Entity Codec — UTF-8 safe Base64, URL percent-encoding, and HTML entity encoder/decoder.