Free AI & Developer Tools
Token counting, JSON Schema generation, cURL conversion, webhook testing, and related utilities that run entirely in the browser.
A focused set of browser-based tools for developers working with LLM APIs, structured outputs, webhooks, and integration debugging. Estimate tokens, derive schemas, convert cURL examples into code, and validate request payloads without uploading data.
Try AI Tools
Free Token Counter for LLMs
Estimate token usage for major LLM families so you can plan context size and API cost before sending a request.
Open toolFree JSON Schema Generator
Generate JSON Schema from sample payloads for API validation, AI tools, and typed interfaces.
Open toolcURL to Code Converter
Convert cURL commands into Python, JavaScript, Go, or PHP code for faster integration work.
Open toolAPI Key Generator
Generate random API keys locally in several common formats for development, testing, and internal tooling.
Open toolWebhook Tester
Format webhook payloads, verify HMAC signatures, and build cURL requests for local integration testing.
Open toolFunction Calling Definition
Generate OpenAI-style function calling JSON from a sample payload or parameter schema.
Open toolPrompt Template
Build reusable prompt templates with variable placeholders and a live rendered preview.
Open toolMarkdown to API Doc
Convert rough Markdown notes into structured API documentation HTML and a previewable outline.
Open toolBase64 Image to Data URI
Convert Base64 image data into a complete Data URI for multimodal prompts and inline previews.
Open toolJSON to TypeScript
Generate TypeScript interfaces and types from sample JSON for faster frontend and SDK work.
Open toolWhat You Can Build With These AI Tools
This collection covers repetitive work around modern AI integrations: structured outputs, prompt templates, docs as reference, and payloads for multimodal workflows. Everything runs in your browser—no hosted automation required.
Prompt and schema setup
Draft prompt templates, function definitions, JSON schemas, and TypeScript types from the same browser workspace.
Local-first processing
Token estimation, schema inference, cURL conversion, Data URI generation, and document conversion run locally by default.
Tools and articles
Each utility links to a related guide so you can move from quick generation to implementation decisions.
Suggested workflow
- Use Token Counter first to control prompt length and estimate cost.
- Use JSON Schema Generator or Function Calling Definition to shape structured outputs and tool arguments.
- Use Prompt Template to keep prompt variants and placeholders consistent.
- Use cURL Converter to turn documentation requests into project-ready code.
- Use Markdown to API Doc, JSON to TypeScript, or Base64 Image to Data URI when preparing reference material and multimodal payloads.
- Use Webhook Tester or API Key Generator when moving into integration and security checks.