rainbow-text

const express = require('express'); const app = express(); const Rainbow = require('color-rainbow'); const escape = require('escape-html'); const style = require('ansi-styles'); app.use((req, res, next) => { const { text } = req.query; if (text && typeof text === 'string') { req.chars = [...text]; req.colors = Rainbow.create(req.chars.length); return next(); } res.status(400).send('Please provide a string using the ?text query parameter.'); }); app.get('/', ({ chars, colors }, res) => { const r = chars.map((c, i) => `<span style="color: ${colors[i].hexString()}">${escape(c)}</span>`); res.type('text/html'); res.send(r.join('')); }); app.get('/terminal', ({ chars, colors, query }, res) => { const set = ['ansi', 'ansi256', 'ansi16m'].includes(query.colorset) ? query.colorset : 'ansi16m'; const r = chars.map((c, i) => style.color[set].hex(colors[i].hexString()) + c + style.color.close); res.send(r.join('')); }); app.listen(3000);