Why Use relottie?

While Lottie JSON is human-readable, working with it programmatically can be challenging if you treat it merely as raw JSON. Modifying complex nested structures or ensuring changes are valid across the entire animation requires careful handling. relottie offers a more robust and developer-friendly approach.

The Power of Abstract Syntax Trees (ASTs)

relottie's core strength lies in its use of Abstract Syntax Trees (ASTs), specifically the LAST (Lottie Abstract Syntax Tree) format. By transforming Lottie JSON into an AST, relottie provides several key advantages:

• Structured Access: ASTs represent the structure of a Lottie file logically, making it easier to navigate and understand the relationships between different elements (layers, shapes, properties, etc.).

• Simplified Manipulation: Instead of using complex JSON path queries or manually looping through objects, you can use dedicated utilities (like unist-util-visit) and targeted plugins to inspect and modify specific parts (nodes) of the animation tree.

• Reliability: Transformations operate on a well-defined and validated structure, reducing the risk of creating invalid Lottie JSON compared to direct string or object manipulation.

Key Use Cases & Benefits

relottie, with its AST focus and plugin ecosystem, enables you to:

1. Automate Modifications: Perform batch updates across many Lottie files, such as changing brand colors, updating version numbers, validating values, or applying consistent settings.

2. Analyze Animations: Programmatically extract metadata (framerate, dimensions, colors used via relottie-metadata), identify which Lottie features are used (relottie-extract-features), or gather performance metrics.

3. Build Custom Tooling: Create bespoke tools integrated into your specific workflow, such as linters, validators, or custom exporters.

4. Extend Lottie Functionality: While relottie primarily works with standard Lottie JSON, plugins can potentially be developed to add custom data or features (though compatibility with standard players would need to be considered).

5. Integrate with Other Tools: The structured nature of ASTs makes it easier to integrate Lottie processing into larger pipelines - for example, preparing a Lottie file before converting it to the .lottie format using tools like dotlottie-js, or potentially converting it to a unist specification tree - Markdown (remark) or HTML (rehype).

Flexible and Extensible

The plugin-based architecture, inherited from unified, means you can pick and choose the functionalities you need. Use existing official plugins, find community plugins, or create your own to address unique challenges.

In essence, relottie empowers you to treat Lottie animations as dynamic, programmable assets, opening up possibilities beyond simple playback.

Ready to see how it works? Head to the Relottie Quick Start.