# KoguNavi

KoguNavi is a local-first utility hub. Small tools that stay in your browser.
Human-facing pages are available in English and Japanese. English remains the default.
Current public tools process user input in the browser and do not upload tool input to a server.
KoguNavi does not use accounts, payments, databases, or AI APIs in this MVP. Optional Cloudflare Web Analytics can be configured for pageview-level traffic measurement, but it is disabled by default and does not track tool input.

Home: https://kogunavi.com/
Tools index: https://kogunavi.com/tools
About: https://kogunavi.com/about
Privacy: https://kogunavi.com/privacy
Japanese home: https://kogunavi.com/ja
Japanese tools index: https://kogunavi.com/ja/tools
Japanese about: https://kogunavi.com/ja/about
Japanese privacy: https://kogunavi.com/ja/privacy
Structured metadata: https://kogunavi.com/tools.json

## Tools

### JSON Formatter
URL: https://kogunavi.com/tools/json-formatter
Japanese URL: https://kogunavi.com/ja/tools/json-formatter
Description: Format, validate, and beautify JSON locally in your browser.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Debug API responses; Format config files; Clean copied JSON
Agent use cases: Normalize JSON snippets; Validate structured output
Limitations: Does not repair invalid JSON automatically in the MVP.

### Base64 Encode / Decode
URL: https://kogunavi.com/tools/base64-encode-decode
Japanese URL: https://kogunavi.com/ja/tools/base64-encode-decode
Description: Encode and decode Base64 text without uploading input.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Decode small tokens; Encode text snippets; Inspect copied Base64
Agent use cases: Convert small text payloads; Check Base64 examples in documentation
Limitations: Designed for text snippets, not large binary files in the MVP.

### SQL Formatter
URL: https://kogunavi.com/tools/sql-formatter
Japanese URL: https://kogunavi.com/ja/tools/sql-formatter
Description: Format SQL queries locally in your browser.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Clean messy SQL before sharing; Make generated SQL easier to review; Format SQL without uploading sensitive queries
Agent use cases: Normalize SQL snippets before documentation; Format generated SQL for review; Prepare SQL examples for markdown output
Limitations: Formatting only, not validation.; Does not execute SQL.; Dialect support may vary.; Stored procedures and vendor-specific syntax may not format perfectly.

### URL Encode / Decode
URL: https://kogunavi.com/tools/url-encode-decode
Japanese URL: https://kogunavi.com/ja/tools/url-encode-decode
Description: Encode and decode URL components locally.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Prepare query parameters; Debug encoded URLs; Clean copied links
Agent use cases: Normalize URL components; Decode URL samples for structured output
Limitations: Handles URL components, not full URL validation in the MVP.

### Character / Word Counter
URL: https://kogunavi.com/tools/character-word-counter
Japanese URL: https://kogunavi.com/ja/tools/character-word-counter
Description: Count characters, words, lines, and UTF-8 bytes for multilingual text.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Check post length; Measure multilingual text; Review prompt size
Agent use cases: Estimate text payload size; Summarize text length constraints
Limitations: Word counts for languages without spaces are approximate in the MVP.

### UUID Generator
URL: https://kogunavi.com/tools/uuid-generator
Japanese URL: https://kogunavi.com/ja/tools/uuid-generator
Description: Generate UUID v4 values locally in your browser.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Create sample IDs; Fill test fixtures; Prepare documentation examples
Agent use cases: Generate placeholder identifiers; Prepare mock payload examples
Limitations: UUIDs are random identifiers, not passwords or secrets.; UUIDs are not sequential.; UUIDs do not provide a database collision guarantee by themselves.

### Unix Timestamp Converter
URL: https://kogunavi.com/tools/unix-timestamp-converter
Japanese URL: https://kogunavi.com/ja/tools/unix-timestamp-converter
Description: Convert Unix timestamps and date/time values locally.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Debug API timestamps; Convert log times; Prepare date examples
Agent use cases: Normalize timestamp examples; Explain API date fields
Limitations: Browser local time depends on the user's device timezone.; Does not handle historical timezone database edge cases.; Custom timezone conversion is not supported in v1.

### Markdown Table Generator
URL: https://kogunavi.com/tools/markdown-table-generator
Japanese URL: https://kogunavi.com/ja/tools/markdown-table-generator
Description: Build Markdown tables from an editable local grid.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Draft README tables; Convert simple CSV to Markdown; Prepare docs tables
Agent use cases: Normalize tabular snippets; Prepare Markdown output examples
Limitations: Simple CSV/TSV import only.; Not a spreadsheet editor.; Escapes pipe characters but does not support complex CSV quoting in v1.

### Hash Generator
URL: https://kogunavi.com/tools/hash-generator
Japanese URL: https://kogunavi.com/ja/tools/hash-generator
Description: Generate SHA hashes for text locally with Web Crypto.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Create text checksums; Compare hash examples; Document digest values
Agent use cases: Generate checksum examples; Prepare hash fixtures for documentation
Limitations: Not a password storage tool.; SHA-1 is legacy and should not be recommended for security.; Browser Web Crypto availability may vary.

### Markdown Live Preview
URL: https://kogunavi.com/tools/markdown-live-preview
Japanese URL: https://kogunavi.com/ja/tools/markdown-live-preview
Description: Write Markdown on one side and preview the rendered page on the other, locally in your browser.
Processing mode: local - Runs in the browser without uploading user input.
Human use cases: Preview README drafts; Review meeting notes; Prepare documentation pages
Agent use cases: Render generated Markdown for review; Extract plain text from Markdown examples
Limitations: Preview is for rendering and reading Markdown, not executing HTML.; PDF export uses browser print behavior.; Not all GitHub rendering details may match exactly.; External images or embedded HTML may be restricted for privacy and safety.