AI/API
Chat Messages JSON
Build the messages[] payload for OpenAI, Anthropic, and Gemini chat APIs with a visual editor.
JSON · 35 tokens
{
"messages": [
{
"role": "system",
"content": "You are a helpful assistant."
},
{
"role": "user",
"content": "Hello!"
}
]
}Related tools
All →AI/PROMPT
Prompt Library
Curated AI prompt templates plus a role-task-context prompt generator.
AI/TOKENS
AI Token Counter
Estimate GPT, Claude, Gemini, and Llama token counts and context window usage for any text.
AI/PRICING
AI Cost Calculator
Compare LLM API costs across GPT-4o, Claude, Gemini, Llama and more per call and at scale.
AI/PROMPT
AI Prompt Optimizer
Turn a rough idea into a structured role-task-context-format-constraints prompt for any LLM.