Tool directory

Every YamlBox tool

19 focused utilities, all free and all client-side. Filter by name below, or jump to a category — YAML, JSON, code generation, data conversion, and web/encoding tools.

YAML tools

Work with YAML configs, Kubernetes manifests and CI files.

YAML to JSON Convert Kubernetes, Docker and CI configs to JSON with multi-document support. JSON to YAML Generate readable YAML from JSON with indentation and quoting controls.

JSON tools

Format, validate, explore and diff JSON documents.

JSON Formatter Pretty-print, minify and validate JSON with exact error locations. JSON Diff Compare two JSON files and list every change by path. JSON to JSON Schema Infer a validation-ready JSON Schema from any sample payload.

Code generators

Turn sample JSON into typed, ready-to-paste code.

JSON to TypeScript Generate typed interfaces from JSON, with optional keys and unions inferred. JSON to Go Generate Go structs with json tags and omitempty from JSON. JSON to SQL Generate CREATE TABLE and INSERT statements from JSON data.

Data converters

Move data between CSV, XML, Excel, subtitles and JSON.

CSV to JSON Convert CSV/TSV exports to JSON arrays or JSON Lines. JSON to CSV Convert JSON arrays into Excel-ready CSV or TSV files. XML to JSON Convert RSS, SOAP, sitemaps and config XML into predictable JSON. Excel to JSON Convert XLSX workbooks and spreadsheets to JSON, fully offline. SRT to VTT Convert SRT subtitles to WebVTT for HTML5 video players.

Web & encoding

URLs, Base64, JWTs, HTTP requests and timestamps.

JWT Decoder Inspect JWT header, payload and expiry without leaving the browser. Timestamp Converter Convert epoch seconds/millis to dates, or dates back to epoch. URL Encoder / Decoder Percent-encode URLs and decode query strings correctly. Base64 Encoder / Decoder Encode and decode Base64 with correct Unicode and URL-safe support. cURL to fetch Turn cURL commands into fetch, axios or node-fetch code. Markdown Table Generator Turn spreadsheets into aligned GitHub-flavoured Markdown tables.

Every tool has a companion write-up: 19 tool guides covering the format traps behind each one, plus longer format guides.