Null-IG.js

const instagram = async (
  url = 'Link_IG'
) => {
  try {
    const ua =
      'Mozilla/5.0 (iPhone; CPU iPhone OS 18_0 like Mac OS X) AppleWebKit/537.36 (KHTML, like Gecko) CriOS/135.0.7049.83 Mobile/15E148 Safari/604.1'

    const page = await fetch(
      'https://staging.zeawin.com/NullGram/',
      {
        headers: {
          'user-agent': ua
        }
      }
    )

    const html = await page.text()

    const cookie =
      page.headers.get('set-cookie') || ''

    const encoded = html.match(
      /const\s+_0x1a\s*=\s*"([^"]+)"/
    )?.[1]

    let hex = ''

    for (let i = 0; i < encoded.length; i += 2) {
      hex += String.fromCharCode(
        parseInt(encoded.substr(i, 2), 16)
      )
    }

    const decoded = decodeURIComponent(
      atob(
        hex
          .split('')
          .reverse()
          .join('')
      )
    )

    const token = decoded.match(
      /window\.nxToken\s*=\s*'([^']+)'/
    )?.[1]

    const nxTime = Number(
      decoded.match(
        /window\.nxTime\s*=\s*(\d+)/
      )?.[1]
    )

    const start = Date.now()

    let uSum = 0

    for (const c of url) {
      uSum += c.charCodeAt(0)
    }

    const ts =
      nxTime +
      Math.floor((Date.now() - start) / 1000)

    const te = btoa(
      token
        .split('')
        .reverse()
        .join('')
        .substring(0, 10) + (ts + uSum)
    )

    let mChar = ''

    for (let i = 0; i < url.length; i += 2) {
      mChar += url[i]
    }

    const tn = btoa(
      `${mChar}-N-${ts * uSum}-${token.substring(3, 8)}`
    )

    const req = await fetch(
      'https://staging.zeawin.com/NullGram/ig.php',
      {
        method: 'POST',
        headers: {
          'content-type': 'application/json',
          'x-null-token': token,
          origin: 'https://staging.zeawin.com',
          referer:
            'https://staging.zeawin.com/NullGram/',
          cookie,
          'user-agent': ua
        },
        body: JSON.stringify({
          url,
          ts,
          te,
          tn
        })
      }
    )

    const json = await req.json()

    const rot13 = str =>
      str.replace(/[a-zA-Z]/g, c =>
        String.fromCharCode(
          (
            c <= 'Z' ? 90 : 122
          ) >= (c = c.charCodeAt(0) + 13)
            ? c
            : c - 26
        )
      )

    const parsed = JSON.parse(
      decodeURIComponent(
        escape(
          atob(
            rot13(json.payload)
              .split('')
              .reverse()
              .join('')
          )
        )
      )
    )

    return {
      author: parsed.author,
      avatar: parsed.avatar,
      audio: parsed.audio,
      media: parsed.media
    }
  } catch (e) {
    console.error(e)
  }
}

instagram()
  .then(console.log)