mozilla/pdf.js · error · FormatError

Invalid number: ${String.fromCharCode(ch)} (charCode ${ch})

Error message

Invalid number: ${String.fromCharCode(ch)} (charCode ${ch})

What it means

Error "Invalid number: ${String.fromCharCode(ch)} (charCode ${ch})" thrown in mozilla/pdf.js.

Source

Thrown at src/core/parser.js:1035

    if (ch === /* '.' = */ 0x2e) {
      divideBy = 10;
      ch = this.nextChar();
    }
    if (ch < /* '0' = */ 0x30 || ch > /* '9' = */ 0x39) {
      const msg = `Invalid number: ${String.fromCharCode(ch)} (charCode ${ch})`;

      if (
        isWhiteSpace(ch) ||
        /* '(' = */ ch === 0x28 ||
        /* '<' = */ ch === 0x3c ||
        ch === /* EOF = */ -1
      ) {
        // This is consistent with Adobe Reader (fixes issue9252.pdf,
        // issue15604.pdf, bug1753983.pdf, bug1953099.pdf).
        info(`Lexer.getNumber - "${msg}".`);
        return 0;
      }
      throw new FormatError(msg);
    }

    let baseValue = ch - 0x30; // '0'

    while ((ch = this.nextChar()) >= 0) {
      if (ch >= /* '0' = */ 0x30 && ch <= /* '9' = */ 0x39) {
        const currentDigit = ch - 0x30; // '0'
        if (divideBy !== 0) {
          // We are after a point.
          divideBy *= 10;
        }
        baseValue = baseValue * 10 + currentDigit;
      } else if (ch === /* '.' = */ 0x2e) {
        if (divideBy === 0) {
          divideBy = 1;
        } else {
          // A number can have only one dot.
          break;

View on GitHub (pinned to 5903d58d58)

Solutions

1. Fix the malformed number token in the content stream or PDF object; numbers must contain only digits, an optional sign, and at most one decimal point.
2. Regenerate the PDF with a conforming writer if the number was produced by a broken generator.

When it happens

Trigger: Thrown at src/core/parser.js:1035 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of mozilla/pdf.js@5903d58d58 (2026-08-13). Data as JSON: /api/errors/0e670355919849dc. Report an issue: GitHub.