Developer Tests Image APIs for Node.js: Docs, Contracts, and Hidden Token Costs

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A developer evaluated multiple text-to-image APIs for a junior-friendly Node.js web application, prioritizing clean REST design, clear documentation, and predictable response formats over the number of available models. The test used a fixed set of 20 prompts across categories and validated JSON payloads before processing any image data, mapping results into a shared internal type. A key lesson emerged around cost estimation: one experiment consumed 1.7 million tokens instead of the projected 400,000 because retrieved context was silently duplicated across prompt variations in a notebook. The developer now tracks token usage separately for each pipeline stage — prompt rewriting, title generation, and alt text — to catch unexpected cost multipliers early. The overall recommendation is to choose the API with the clearest payload contract after testing with your own prompts, since generic benchmarks may not reflect a specific product's visual requirements.

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