Errors hub (no upload)

High-intent troubleshooting pages for parsing and validation errors. Validate locally, fix the first real error, and validate again.

All guides Guides by runtime Errors by runtime Node.js Java C# PHP Ruby Rust Python Go

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Paged errors Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 8 8 pages / 1429 errors

TL;DR: Always inspect the raw input first (status/content-type/first bytes), then validate strictly, fix one error, and re-validate.

Compact root: this page shows up to 24 items per block. Use paged errors for the full list.

Top tools (local-only)

JSON.parse errors (JavaScript/Node/Firefox)

These are the most searched error strings. The first character/token usually tells you what went wrong.

JSON errors in other runtimes

Same root causes appear everywhere: HTML instead of JSON, truncated input, extra characters, invalid escapes, and encoding issues.

Python

Go

Java (Jackson)

C# (Newtonsoft.Json)

PHP

Rust

YAML parse errors (Go/Kubernetes/Python/Java/Ruby)

YAML is indentation-sensitive. Most errors come from tabs/spaces, missing ':' in mappings, or mis-indented lists.

Go / Kubernetes / Helm

Python (PyYAML)

Java (SnakeYAML)

Ruby (Psych)

CSV parser errors

Most CSV errors come from delimiter and quoting rules. Find the first broken row and fix it.

XML parsing errors

XML is strict: one invalid character or an unescaped & can break the whole document. Fix the first error and re-validate.

Encoding / token errors (Base64, URL, JWT)

Encoded strings often contain secrets. Decode locally and normalize Base64URL/percent-encoding safely.

Related hubs

Errors by runtime Guides by runtime JSON hub CSV hub XML hub YAML hub Encoding hub Privacy hub

FAQ (quick)

Start here: Errors hub (runs locally, no upload).

Can I fix Errors hub (no upload) without uploading my data? Yes. no-upload.ru tools run locally in your browser (NO UPLOAD). Start with Errors hub and keep samples redacted if you must share them.

What is the fastest safe workflow? Validate first, fix the smallest broken part, then validate again before converting/exporting. This prevents silent downstream issues.

Why does Errors hub (no upload) happen? Most issues come from copy/paste truncation, wrong encoding, non-strict syntax (comments/trailing commas), or a shape mismatch (array vs object).

Which tool should I start with for Errors hub (no upload)? Start with Errors hub. If you still see errors, follow the related playbook/trend report on this page.

Privacy & Security

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