Lottie Format

A Lottie file is a JSON-encoded object, whose top-level structure is Animation.

See the JSON schema for a full description of the JSON format.

Media Type

This section registers a new MIME media type, video/lottie+json in conformance with BCP 13 [RFC4288].

Media type name:

video

Media subtype name:

lottie+json

Required parameters:

None

Optional parameters:

None

Encoding considerations:

8bit, UTF-8 encoded text

Security considerations:

Security considerations relating to the generation and consumption of Lottie files are similar to application/json and are discussed in Section 12 of [RFC8259].
Documents may reference external image assets. Security considerations in the Media Type registrations for those formats shall apply.
A commonly used extension to the format outside of the spec is "expressions" which allow code execution. In itself, the Lottie format is a text based json document and relatively harmless. Support for expressions and security considerations for the same are dependent on the renderer used.

Interoperability considerations:

Processors must expect that content received is well-formed JSON, but it cannot be guaranteed that the content is valid to a particular Schema version, or that the processor will recognize all of the elements and attributes in the document.

Published specification: