Does JSON Size upload my file or text to Tool-You servers?

No. JSON Size runs in this browser tab. Files stay on the device. Limit note: Valid JSON only. Bytes and chars.

Should I use Is JSON instead of JSON Size?

Use JSON Size when you need Byte and char length of JSON text. Use Is JSON when you need JSON validity with type and byte size. They share a category (Developer) but not the same job.

JSON Size

Byte and char length of JSON text.

Validates JSON then reports UTF-8 bytes and character length. Unlike Is JSON this also prints sizes. Unlike UTF-8 Bytes this requires valid JSON first. Invalid JSON fails.

What JSON Size does

Validates JSON then reports UTF-8 bytes and character length. Unlike Is JSON this also prints sizes. Unlike UTF-8 Bytes this requires valid JSON first. Invalid JSON fails.

Practical limit for JSON Size: Valid JSON only. Bytes and chars. That is why output can differ from heavy desktop Developer software. Read the tool-specific note again: Validates JSON then reports UTF-8 bytes and character length. Unlike Is JSON this also prints sizes. Unlike UTF-8 Bytes this requires valid JSON first. Invalid JSON fails.

How to use JSON Size

Keep this tab on JSON Size (/developer/json-size). Pasting into the wrong Developer tool (for example Is JSON) changes the job.
Paste or type the input JSON Size expects. Path hint: developer · json size. Byte and char length of JSON text.
Apply the JSON Size action only. UTF-8 Byte Length is a different transform (UTF-8 bytes, code points, and UTF-16 code units.). Validates JSON then reports UTF-8 bytes and character length. Unlike Is JSON this also prints sizes. Unlike UTF-8 Bytes this requires valid JSON first. Invalid JSON fails.
Copy the output of JSON Size if you need it elsewhere. Size/complexity still follows: Valid JSON only. Bytes and chars.
If the text job is actually JSON validity with type and byte size., leave JSON Size and open Is JSON.

When not to use JSON Size

Skip JSON Size when a neighbor tool matches better — start with Is JSON or UTF-8 Byte Length — or when the description already warns the job will fail. In the tool’s own words: Validates JSON then reports UTF-8 bytes and character length. Unlike Is JSON this also prints sizes. Unlike UTF-8 Bytes this requires valid JSON first. Invalid JSON fails.

Questions about JSON Size

What does JSON Size do that other Developer pages on this site do not?: Validates JSON then reports UTF-8 bytes and character length. Unlike Is JSON this also prints sizes. Unlike UTF-8 Bytes this requires valid JSON first. Invalid JSON fails. Short version: Byte and char length of JSON text.
Does JSON Size upload my file or text to Tool-You servers?: No. JSON Size runs in this browser tab. Files stay on the device. Limit note: Valid JSON only. Bytes and chars.
Should I use Is JSON instead of JSON Size?: Use JSON Size when you need Byte and char length of JSON text. Use Is JSON when you need JSON validity with type and byte size. They share a category (Developer) but not the same job.
What are the limits of JSON Size?: Valid JSON only. Bytes and chars. Also: Validates JSON then reports UTF-8 bytes and character length. Unlike Is JSON this also prints sizes. Unlike UTF-8 Bytes this requires valid JSON first. Invalid JSON fails.