tomnomnom/gron · error

JSON internal error

Error message

JSON internal error

What it means

While converting a decoded JSON document into Gron statement tokens, json.Marshal failed on a float64 array element (or on the statement's value) — types that JSON encoding must always support. The wrap message marks this as an internal invariant violation, not bad user input, since the value originated from successful json.Unmarshal decoding.

Solutions

1. Investigate the wrapped json.Marshal error; a failure here indicates corrupted or impossible in-memory state
2. Verify the input decoding path produces only standard JSON-encodable values (float64, string, bool, nil, arrays, maps)

When it happens

Trigger: Thrown at statements.go:214 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tomnomnom/gron@88a6234ea2 (2026-09-06). Data as JSON: /api/errors/11ee6115435be432. Report an issue: GitHub.

Appendix: source

Thrown at statements.go:214

	v = a[1]
	a, ok = a[0].([]interface{})
	if !ok {
		goto out
	}

	// We'll append one initial token, then 3 tokens for each element of a,
	// then 3 closing tokens, that's alltogether 3*len(a)+4.
	s = make(statement, 0, 3*len(a)+4)
	s = append(s, token{"json", typBare})
	for _, e := range a {
		s = append(s, token{"[", typLBrace})
		switch e := e.(type) {
		case string:
			s = append(s, token{quoteString(e), typQuotedKey})
		case float64:
			nbuf, err = json.Marshal(e)
			if err != nil {
				return nil, errors.Wrap(err, "JSON internal error")
			}
			nstr = string(nbuf)
			s = append(s, token{nstr, typNumericKey})
		default:
			ok = false
			goto out
		}
		s = append(s, token{"]", typRBrace})
	}

	s = append(s, token{"=", typEquals})

	switch v := v.(type) {
	case bool:
		if v {
			t = typTrue
		} else {
			t = typFalse

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